Question 1

The sample standard deviation s is an unbiased estimator of the population standard deviation σ.

Accepted Answer

A) True 
 B)False

Question 2

In order to select a stratified random sample,we divide the population into overlapping groups of similar elements.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following is a type of question used in survey research?

Accepted Answer

A) Dichotomous 
B) Free response 
C) Rating 
D) All of these

Question 4

An unbiased estimate of ?2 is _____.

Accepted Answer

A) s 
B) s2 
C)  $\bar { X }$ 
D) ?

Question 5

A sample statistic is an unbiased point estimate of a population parameter if the mean of the populations of all possible values of the sample statistic equals the population parameter.

Accepted Answer

A) True 
 B)False

Question 6

The sampling distribution of a sample statistic is the probability distribution of the population of all possible values of the sample statistic.

Accepted Answer

A) True 
 B)False

Question 7

The Central Limit Theorem states that as sample size increases,the population distribution more closely approximates a normal distribution.

Accepted Answer

A) True 
 B)False

Question 8

Find $\mathrm { P } ( \bar { X } < 25 )$ If ? = 16 and $\sigma _ { \bar { X } } = 4$

Accepted Answer

A) 1.000 
B) 2.25 
C) .9878 
D) .0122

Question 9

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.What is μx?

Accepted Answer

A) 50 
B) 5 
C) 8.33 
D) 0.833

Question 10

If p = .8 and n = 50,then we can conclude that the sampling distribution of $\hat { p }$ 
is approximately a normal distribution.

Accepted Answer

A) True 
 B)False

Question 11

According to a hospital administrator,historical records over the past 10 years have shown that 20 percent of the major surgery patients are dissatisfied with after-surgery care in the hospital.A scientific poll based on 400 hospital patients has just been conducted.Sixty-four patients indicated that they were dissatisfied with the after-surgery care.What are the mean and the standard deviation of the sampling distribution of $\hat { p }$?

Accepted Answer

A) 16% and .034% 
B) 20% and 1.83% 
C) 20% and 2% 
D) 20% and .034% 
E) 20% and 16%

Question 12

If we have a sample size of 100 and the estimate of the population proportion is .10,we can estimate the sampling distribution of $\hat { p }$ 
with a normal distribution.

Accepted Answer

A) True 
 B)False

Exam 7: Sampling and Sampling Distributions

The sample standard deviation s is an unbiased estimator of the population standard deviation σ.

In order to select a stratified random sample,we divide the population into overlapping groups of similar elements.

Which of the following is a type of question used in survey research?

An unbiased estimate of ?² is _____.

A sample statistic is an unbiased point estimate of a population parameter if the mean of the populations of all possible values of the sample statistic equals the population parameter.

The sampling distribution of a sample statistic is the probability distribution of the population of all possible values of the sample statistic.

The Central Limit Theorem states that as sample size increases,the population distribution more closely approximates a normal distribution.

Find $\mathrm { P } ( \bar { X } < 25 )$ If ? = 16 and $\sigma _ { \bar { X } } = 4$

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.What is μ_x?

If p = .8 and n = 50,then we can conclude that the sampling distribution of $\hat { p }$ is approximately a normal distribution.

If we have a sample size of 100 and the estimate of the population proportion is .10,we can estimate the sampling distribution of $\hat { p }$ with a normal distribution.

Exam 7: Sampling and Sampling Distributions

The sample standard deviation s is an unbiased estimator of the population standard deviation σ.

In order to select a stratified random sample,we divide the population into overlapping groups of similar elements.

Which of the following is a type of question used in survey research?

An unbiased estimate of ?2 is _____.

A sample statistic is an unbiased point estimate of a population parameter if the mean of the populations of all possible values of the sample statistic equals the population parameter.

The sampling distribution of a sample statistic is the probability distribution of the population of all possible values of the sample statistic.

The Central Limit Theorem states that as sample size increases,the population distribution more closely approximates a normal distribution.

Find P(Xˉ<25) \mathrm { P } ( \bar { X } < 25 ) P(Xˉ<25) If ? = 16 and σXˉ=4\sigma _ { \bar { X } } = 4σXˉ​=4

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.What is μx?

If p = .8 and n = 50,then we can conclude that the sampling distribution of p^\hat { p }p^​ is approximately a normal distribution.

If we have a sample size of 100 and the estimate of the population proportion is .10,we can estimate the sampling distribution of p^\hat { p }p^​ with a normal distribution.

An unbiased estimate of ?² is _____.

Find $\mathrm { P } ( \bar { X } < 25 )$ If ? = 16 and $\sigma _ { \bar { X } } = 4$

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.What is μ_x?

If p = .8 and n = 50,then we can conclude that the sampling distribution of $\hat { p }$ is approximately a normal distribution.

If we have a sample size of 100 and the estimate of the population proportion is .10,we can estimate the sampling distribution of $\hat { p }$ with a normal distribution.