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Question 1 The population of newborn babies (i., younger than 3 months old) produces an average of = 12 dirty diapers with a standard deviation of =...
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# Question 1Group of answer choicesa. 4 diaper differenceb. .667 diaper differencec. .111 diaper difference

The population of newborn babies (i.e., younger than 3 months old) produces an average of μ = 12 dirty diapers with a standard deviation of σ = 4. If you randomly selected n = 36 newborn babies, how well on average will the sample represent the population (i.e., what is the expected difference between the sample and population mean by chance)?

d. .894 diaper difference

e. .333 diaper difference

Question 2

A random sample of n = 36 scores is selected from a population. Which of the following distributions definitely will be normal?

a. Neither the sample, the population, nor the distribution of sample means will definitely be normal.

b. The sampling distribution will form a normal distribution.

c. The scores in the population will form a normal distribution.

d. The scores in the sample will form a normal distribution.

Question 3

Which of the following distributions will definitely not be normal?

a. The distribution of sample means with a sample size of n = 36 from a normally distributed population.

b. The distribution of sample means with a sample size of n = 36 from a population with a positive skew.

c. The distribution of sample means with a sample size of n = 16 from a normally distributed population.

d. The distribution of sample means with a sample size of n = 16 from a population with a positive skew.

Question 4

A population has μ = 80 with σ = 8. The distribution of sample means of size n = 4 selected from this population would have a value of ________ for the mean of sample means.

a. μm = 20

b. μm = 40

c. μm = 8

d. μm = 80

Question 5

A sample of n = 16 scores is obtained from a population with μ = 70 and σ = 20. What sample mean values are in the 20th percentile of the sampling distribution (i.e., the lowest 20% of all possible means of n = 16 from this population)?

a. sample means above 74.2

b. sample means at or below 74.2

c. sample means above 65.8

d. sample means at or below 65.8

e. sample means above 86.8

f. sample means at or below 86.8

g. sample means above 53.2

h. sample means at or below 53.2

Question 6

A sample is obtained from a population with μ = 50 and σ = 8. Which of the following samples is least likely (least probable)? Try using logic instead of calculations.

a. a sample of n = 4 scores with M = 52

b. a sample of n = 4 scores with M = 54

c. a sample of n = 16 scores with M = 52

d. a sample of n = 16 scores with M = 54

Question 7

A random sample of n = 4 scores is obtained from a normal population with μ = 20 and σ = 4. What is the probability of obtaining a mean greater than M = 24 for this sample?

a. p = .1587

b. p = .9772

c. p = .0228

d. p = .8413

e. p = .6915

f. p = .3085

Question 8

A random sample of n = 4 scores is obtained from a normal population with μ = 40 and σ = 6. What is the probability of obtaining a mean less than or equal to M = 43 for this sample?

a. p = .8413

b. p = .1587

c. p = .9772

d. p = .0228

e. p = .6915

f. p = .3085

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