AnswersNC-Math 4Sampling Distributions – Center and Variability

Sampling Distributions – Center and Variability Answers

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1
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Which option best describes the shape of the approximate sampling distribution of the sample proportion of orange marbles when selecting samples of size 50?

A
cannot be determined
B
skewed
C
Normal
D
roughly symmetric
2
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Suppose p = 0.2 and n = 15. Which is the best description for the sampling distribution of ?

Question illustration
A
skewed to the right
B
skewed to the left
C
symmetric
D
cannot be determined
3

Suppose p = 0.1 and n = 150. Which is the best description for the sampling distribution of ?

Question illustration
A
Skewed to the right
B
Skewed to the left
C
Uniform
D
Approximately Normal
4

It is claimed that 12% of all students in the US have blue eyes. A random sample of 50 students is selected. Which is the best description for the shape of the sampling distribution of ?

Question illustration
A
skewed right
B
skewed left
C
approximately Normal
D
cannot be determined
5

The mean of the sampling distribution of is .

A
0.046
B
0.12
C
0.50
6

About 53% of adults in the US have traveled with a commercial airline. A random sample of 400 adults was selected and whether they have traveled with a commercial airline was recorded.Calculate the standard deviation of the sampling distribution of .

Question illustration
A
0.00062
B
0.00086
C
0.00125
D
0.02495

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