Answer:
C. A clothing store claims that 45% of its customers prefer skinny jeans over regular jeans. They concluded this from a survey which asked 120 randomly selected teenage customers which style they prefer.
E. A report by a company that manufactures hair brushes says 56% of people who buy their brushes own only one hair brush. The conclusion comes from a survey of 500 males who bought the company's brush.
Step-by-step explanation:
These two are the biased reports because they don't include the full population.
C is biased because it only includes teens, not people of any other age.
E is biased because it only included males, not females.
A isn't biased because it includes the stated population, high school students in the city.
B isn't biased because the sample was of 50 random customers, which is the general population.
D isn't biased as it included all data from the website.
Hope this helps!
The solution is,:
1) A clothing store claims that 45% of its customers prefer skinny jeans over regular jeans. They concluded this from a survey which asked 120 randomly selected teenage customers which style they prefer.
3) A report by a company that manufactures hair brushes says 56% of people who buy their brushes own only one hair brush. The conclusion comes from a survey of 500 males who bought the company's brush.
What is sample and statistic?A portion of population taken and analyzed to predict information about population is called sample of that population.
Ex: When someone surveys a group, then he/she surveys a portion and not whole population in general.
Those numbers who summarize information about sample are called statistic.
(Statistic is different than statistics)
The numbers which summarize information about the sample are called statistic.
The scenarios in which the statistics are misleading;
1) A clothing store claims that 45% of its customers prefer skinny jeans over regular jeans. They concluded this from a survey which asked 120 randomly selected teenage customers which style they prefer.
3) A report by a company that manufactures hair brushes says 56% of people who buy their brushes own only one hair brush. The conclusion comes from a survey of 500 males who bought the company's brush.
Learn more about z-statistic here:
brainly.com/question/1640298
#SPJ2
Anyone know how to do this?
Answer:
They cannot form a triangle.
Step-by-step explanation:
A triangle can only be formed if the sum of the lengths of any 2 sides are greater than the 3rd side. 2 + 7 is less than 15, so this cannot be a triangle.
what is 4 divided by 11 in long division
Answer:
0.3636363636
it keeps on continuing
Hey yall I really need some help; Image attached below
- 50 points
Answer:
YAY an answer got deleted so i can add mine!
Step-by-step explanation:
like i said the answer is 72m2
to find the area you multiply 48 by 1.5
48 x 1.5 = 72
Divide the given polynomial by given monomial.
Answer:
i have made it in above picture
convert 9,78 h to hours, minutes and seconds
If a coin is flipped four times, find the probability distribution for the number of heads. Listed below are four charts. Choose
the chart that best evaluates the data.
Answer:
The answer is C
Step-by-step explanation:
Convert 7 kilometers into miles. Round your answer to the nearest
hundredth.
Answer:
4.34 miles
Step-by-step explanation:
7 kilometers = 4.3496 miles
4.3496 miles rounded to the nearest hundredth
= 4.34 miles
Answer: 4.35 is the correct answer
Step-by-step explanation:
What is 2 ½ divided by ½ equal too
Answer:
it woulb be 1.25
here's a graph of a linear function write the equation that describes that function
Answer:
y=3/4x+2
Step-by-step explanation:
Plz help I will give 40 points and Brainly
Answer:
I don't think so man
Step-by-step explanation:
math .....................
Please find the area of of the shaded polygon
Answer:
8
Step-by-step explanation:
HELP ASAP I AM DOING IREADY
Answer:
-11 / 4
11 / -4
-11/4
11/-4
Thats it. (A, B, D, E)
please help
answer choices:
A:0.125
B:0.20
C:0.80
D:1.0
9514 1404 393
Answer:
B: 0.20
Step-by-step explanation:
Green was selected 8 of the 40 times. We expect its probability of selection to be about ...
8/40 = 1/5 = 0.20 . . . p(green)
Answer:
B 0.2
Step-by-step explanation:
First find out how many marbles are in total
16 + 8 + 6 + 9 + 1 = 40
Then simply divide the number of green marbles by the total.
8 / 40 = 0.2
This graph shows the solution to which inequality?
(3, 3)
(-3,-1)
Answer: The answer is b
Step-by-step explanation:
The Arc Electronic Company had an income of 7676 million dollars last year. Suppose the mean income of firms in the same industry as Arc for a year is 9090 million dollars with a standard deviation of 77 million dollars. If incomes for this industry are distributed normally, what is the probability that a randomly selected firm will earn more than Arc did last year
Answer:
0.9772 = 97.72% probability that a randomly selected firm will earn more than Arc did last year
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
Suppose the mean income of firms in the same industry as Arc for a year is 90 million dollars with a standard deviation of 7 million dollars.
This means that [tex]\mu = 90, \sigma = 7[/tex]
What is the probability that a randomly selected firm will earn more than Arc did last year?
Arc earned 76 million, so this is 1 subtracted by the pvalue of Z when X = 76.
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{76 - 90}{7}[/tex]
[tex]Z = -2[/tex]
[tex]Z = -2[/tex] has a pvalue of 0.0228
1 - 0.0228 = 0.9772
0.9772 = 97.72% probability that a randomly selected firm will earn more than Arc did last year
The perimeter of a rectangular chicken coop is 44 feet. The width is w feet and the length is w + 4 feet. What are the length and width of the coop?
Answer:
w = 9 ft
l = 13 ft
Step-by-step explanation:
2w + 2(w+4) = 44
simplify:
4w + 8 = 44
4w = 36
w = 9 ft
l = 13 ft
I have an old alarm clock, on which the hands move at only 95% of the speed that they should do.
I need it to wake me up at 7.30 am, so every night, at 10.30pm, I change the time shown on the
clock so that it will show the correct time at 7.30 am when the alarm goes off.
(a) What time does the clock show at 10.30 pm, immediately before I change it?
(b) What time do I change it to?
Please help immediately!!!
9514 1404 393
Answer:
a) 9:45 pm
b) 10:57 pm
Step-by-step explanation:
In the 15 hours between 7:30 am and 10:30 pm, the clock hands will have moved 15×0.95 = 14.25 hours = 14 hours and 15 minutes.
At 10:30 pm, the clock indicates 9:45 pm.
__
b) In the 9 hours between 10:30 pm and 7:30 am, the clock will have moved 9×0.95 = 8.55 hours, or 8 hours 33 minutes. That is, the clock needs to be set 27 minutes ahead of the actual time.
The clock need to be set to 10:57 pm.
_____
Alternate solution
At 95% speed, the clock loses 5%×60 minutes = 3 minutes each hour. In the 15 hours from morning to night, the clock will be 45 minutes slow. It will indicate 9:45 at 10:30 pm.
In the 9 hours from night to morning, the clock will lose 27 minutes so needs to be set 27 minutes fast. It should be set to 10:57 pm at 10:30 pm.
An Olympic swimmer competes in the same events during each long course swim season. A swimmer currently
competing on the United States Women's Olympic Swim Team, will swim her best events each year with the hope of
continuous Improvement. The following table is a record of the swimmer's best times for the 100 meter freestyle event,
measured In long course meters.
Long Course Recorded
Season Best Time
2005 2:33.42
2006
2:24.81
2007
2:10.93
2008
2:03.45
2009
1:58.67
2010
1:59.17
1:55.06
2011
2012
1:55.82
2013
1:54.81
2014
2:00.03
1. Create a scatter plot representing the data displayed in the table.
2. Use the scatter plot to determine whether there is positive, negative or no correlation between the data values.
3. Write a conclusion statement regarding the data and the rate of change present in the line of best fit. Do not actually
calculate the slope or write the equation for the line of best fit.
Please help me
Will give brainly
Just give me the answer to 2 and 3
I already have 1
I just need 2 and 3
Please and thank you
Please answer this
Answer: Equation for the line of best fit is given by f(x)=-4.28402x+0.0875
Step-by-step explanation: like what you just put in your picture
Long Course Season Recorded Best time
2005 2:33.42
2006 2:24.81
2007 2:10.93
2008 2:03.45
2009 1:58.67
2010 1:59.17
2011 1:55.06
2012 1:55.82
2013 1:54.81
2014 2:00.03
-Since we can see from the scatter plot that it has negative correlation.
Equation for the line of best fit is given by f(x)=-4.28402x+0.0875
- This is what I can give you I see some people do this work before and when I see it I just take note and I think it was the answer...
- Hope this help :)
look at picture for question. will mark brainilest please
Answer:
b. 3 pounds
.............
PLEASE HELP!!!!!!!!!! Which list of numbers is ordered from smallest magnitude to largest magnitude?
3.0.1-10]. 1-221
0.3.1-101.1-221
|-221.1-10.30
1-221.1-10.0.3
Answer:
the second one, 0,3,|-10|,|-22|
Step-by-step explanation:
The question is asking for the order smallest to largest. When a number is placed in absolute value, | |, it automatically becomes a positive number.
With that said, 0 is the smallest and 22 is the greatest.
a ramp was constructed to load a truck. if the ramp is 10 ft long and the horizontal distance from the bottom of the ramp to the is 8 ft, what is the height from the ground to the top of the ramp?
Find the probability that when a couple has five children, at least one of them is a boy. (assume that boys and girls are equally likely.)
Answer:
The easiest way to figure this is to find P(no girls in 5 births) = (1/2)^5 = 1/32 -------------- The P(at least one girl in 5 births) = 1 - 1/32 = 31/32
The probability that when they have five children, at least one of them is a boy is 31/32
Probability is the likelihood or chance that an event will occur.
Probability = Expected outcome/Total outcome:
The probability that a couple will have a boy or girl among the five children = 1/2
If they gave birth to 5 children:
The probability that when they have five children, at least one of them is a boy = 1 - (1/2)^n where:
n is the total number of children
The probability that when they have five children, at least one of them is a boy = 1 - (1/2)ⁿ
The probability that when they have five children, at least one of them is a boy = 1 - (1/2)⁵
The probability that when they have five children, at least one of them is a boy = 1- 1/32 = 31/32
Hence the probability that when they have five children, at least one of them is a boy is 31/32
Learn more here: https://brainly.com/question/13604758
What is the area of the triangle below?
20 square units
15 square units
7.5 square units
30 square units
Answer:
7.5 square units
Step-by-step explanation:
Base of the triangle = 5 units
Height of the triangle = 3 units
Area of the triangle
[tex] = \frac{1}{2} \times base \times height \\ \\ = \frac{1}{2} \times 5 \times 3 \\ \\ = \frac{1}{2} \times 15 \\ \\ = 7.5 \: {units}^{2} [/tex]
Answer:
7.5
Step-by-step explanation:
Batteries R Us is a manufacturer of batteries and are testing a new production technique for their most popular battery type. It is known that the mean lifetime of these batteries made using the previous production technique was 69 hours. The standard deviation in battery lifetime is 5.0 hours and it is assumed that this has not changed. They would like to know whether mean battery lifetime has increased with the new production technique. The following sample data of battery lifetimes has been collected from a random sample of 40 batteries made using the new manufacturing technique.
Battery lifetimes (hours)
82.5 78.4 80.2 78.7 67.8 76 74.8 73.9 68.8 70.3 70.7 70.7 77.9
80.5 73.8 80.979.2 74.173.2 76.1 69 73 70.9 63.3 67.8 78.5 68.7
67.5 68.2 68.2 73.3 75.4 73.2 72.2 72.6 72 71.3 69.9 69.6 70.4
Required:
a. Conduct a hypothesis test to test whether the new manufacturing process has increased mean battery lifetime.
b. Calculate the test statistic.
Answer:
(a) Accept the alternate hypothesis
(b) [tex]t = 104.86[/tex]
Step-by-step explanation:
Given
[tex]\mu= 69[/tex]
[tex]\sigma = 5.0[/tex]
The sample data
Solving (a): Test whether the process increases the mean battery life
First, we state the null hypothesis
This states that the mean is 69
[tex]H_o :\mu = 69[/tex]
Next, the alternate hypothesis is to test that the mean has changed.
i.e [tex]H_a: \mu \ne 69[/tex]
Calculate the mean:
[tex]\mu = \frac{\sum x}{n}[/tex]
[tex]\mu = \frac{82.5 +78.4 +80.2 +78.7 +67.8 +76 +74.8 +73.9 +68.8 +70.3 +70.7 +70.7......+69.6 +70.4}{40}[/tex]
[tex]\mu = \frac{2923.5}{40}[/tex]
[tex]\mu = 73.0875[/tex]
Calculate the standard deviation
[tex]\sigma = \sqrt{\frac{\sum(x - \mu)^2}{n}}[/tex]
[tex]\sigma= \sqrt{\frac{(82.5-73.0875)^2 +(78.4 -73.0875)^2 +(80.2 -73.0875)^2 +(78.7 -73.0875)^2 +......+(70.4-73.0875)^2}{40}}[/tex][tex]\sigma= \sqrt{\frac{776.76375}{40}}[/tex]
[tex]\sigma= \sqrt{19.41909375}[/tex]
[tex]\sigma= 4.407[/tex]
From the calculations above: The calculated mean 73.0875 is not the same as 69.
Hence, we accept the null hypothesis that: [tex]H_a: \mu \ne 69[/tex]
Solving (b): The test statistic
This is calculated as:
[tex]t = \frac{\mu}{\sigma/\sqrt n}[/tex]
This gives:
[tex]t = \frac{73.0875}{4.407/\sqrt {40}}[/tex]
[tex]t = \frac{73.0875}{4.407/6.325}[/tex]
[tex]t = \frac{73.0875}{0.697}[/tex]
[tex]t = 104.86[/tex]
Two photographers offer different pricing plans for their services. The graph below models the prices Photographer A charges. The table below shows the prices Photographer B charges. Each photographer charges a one-time equipment fee and an hourly rate.
Which statement about the two pricing plans is true?
A Photographer A equipment fee is $25\$ 25$25 less than Photographer B
B Photographer B equipment fee is $25\$ 25$25 less than Photographer A
C Photographer B charges $15\$ 15$15 per hour more than Photographer A
D Photographer A charges $15\$ 15$15 per hour more than Photographer B
Answer: D
Step-by-step explanation:
Double g, then subtract f from the result
Answer:
2g - f
Step-by-step explanation:
Which is an odd monomial function?
y=2x^3
Y= 1/x
Y = 5x^-9
O y= 3
Answer:
) -x*+5x=5. & x*-} x + 2x + x +4. 22 / 3 x ² - 1 / 8x + 5 x² { x + 5. --** - *-3.
Answer: y= 2x^3
Step-by-step explanation:
6 1 8 4 2 7
What comes next and why
Answer:
The answer to your question is:
4, 9
Two brothers went shopping at a back to school sale where all shirts and shorts are the same price. The younger brother spent $175 on 7 new shirts and 7 pairs of shorts. The older brother purchased 6 new shirts and 7 pairs of shorts and paid a total of $165. Write the system of equations for this problem.
Answer:
Each shirt costs $ 10, while each short costs $ 15.
Step-by-step explanation:
Since two brothers went shopping at a back to school sale where all shirts and shorts are the same price, and the younger brother spent $ 175 on 7 new shirts and 7 pairs of shorts while the older brother purchased 6 new shirts and 7 pairs of shorts and paid a total of $ 165, to determine the price of each shorts and each shirt the following system of equations must be considered:
Shirt = X
Short = Y
7X + 7Y = 175
6X + 7Y = 165
7X - 6X + 7Y - 7Y = 175-165
X = 10
7x10 + 7Y = 175
70 + 7Y = 175
7Y = 175 - 70
Y = 105/7
Y = 15
Thus, each shirt costs $ 10, while each short costs $ 15.
Answer:
3x + 4y =108
7x + 5y =114
workout the following divisions:
Answer:
I think this is the same as yesterday.
