When selecting a random sample, each score in the population __________.

A. must be sampled without replacement

B. must have a random mean

C. must be selected on time

D. must have the same probability of being selected

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If you select a sample size of 100 from a population of raw scores and construct a distribution of sample means, what shape will the distribution of sample means have

A. left-skewed

B. right-skewed

C. approximately normal

D. more information is needed about the shape of the population of raw scores

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If you select a sample size of 100 from a population of raw scores and construct a distribution of sample means, what shape will the distribution of sample means have?

A. left-skewed

B. right-skewed

C. approximately normal

D. more information is needed about the shape of the population of raw scores

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Scores in a population are normally distributed with a mean of 50 and a standard deviation of 2. What is the mean of the distribution of sample means for samples of sizeN= 25?

A. 50

B. 4.38

C. 2

D. 0.40

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Scores in a population are normally distributed with a mean of 50 and a standard deviation of 2. What is the mean of the distribution of sample means for samples of sizeN= 25?

A. 4.38

B. 2

C. 50

D. 0.40

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A population has a mean, = 120 and a standard deviation, = 18. What is the z score for a sample mean of 122, from a sample of 81 people?

A. 9.09

B. 0.11

C. 0.22

D. 1.00

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A test of psychology knowledge is normally distributed with a mean, = 80 and a standard deviation, = 5. If a sample ofN= 25 students completes the test, what is the probability that their mean would be greater than 81.5?

A. 0.3000

B. 0.9332

C. 0.3821

D. 0.0668