PSYCH 311 2 of 4 WSU

A.) True

42. There are more possible samples that can be selected using theoretical sampling than using experimental sampling for any sample size greater than 1. A) True B) False

B.) False

43. The central limit theorem states that the sample mean will equal the population mean on average. A) True B) False

A.) True

44. The sampling distribution of the mean has minimum variance. A) True B) False

A.) True

45. The sampling distribution of the mean is a distribution of all the possible samples of a particular size that can be selected from a given population. A) True B) False

A.) True

47. There are 25 possible samples of size 2 that can be selected from a population of 5 people using theoretical sampling. A) True B) False

B.) 40

48. A researcher states that a sample of 100 shoppers spend 112 ± 40 (M ± SEM) dollars on groceries each week. Which value is the standard error of the mean? A) 112 B) 40 C) 100 D) The standard error of the mean is not reported in the article

A.) True

27. The binomial probability distribution is distributed with µ=np, and δ= √npq . A) True B) False

B.) False

40. If a researcher selects a sample of 64 participants from a population with a variance of 16, then the standard error of the mean will be 2.0. A) True B) False

A.) True

41. The sample mean is an unbiased estimator of the population mean. A) True B) False

A.) True

28. A binomial probability distribution is the distribution of random outcomes for a bivariate or dichotomous random variable. A) True B) False

A.) -3

29. Assume number of days absent is normally distributed. If a sample mean is 8 and SD is 2, what's the z-score for a person with 2 days absent? A) -3 B) -2 C) 3 D) 99

B.) a sampling distrabution

30. A distribution of all sample means or sample variances that could be obtained in samples of a given size from the same population is called A) a conditional procedure B) a sampling distribution C) sampling without replacement D) random sampling

A.) Sampling with Replacement

31. A researcher selects from a participant pool of 4 males and 6 females. He determines that the probability of selecting 2 male participants is p = .16. Based on this probability, what strategy did the researcher use to sample participants. A) sampling with replacement B) sampling without replacement

B.) 1,000,000

32. A researcher selects a sample of size 6 from a population of size 10. How many possible samples of this size can be selected using theoretical sampling? A) 100,000 B) 1,000,000 C) 10,000,000 D) over 60,000,000 samples

C.) Persons B, C, and D

33. Suppose you select a sample of three people from a population of four (A, B, C, D). Which of the following samples is possible using the experimental sampling strategy? A) persons A, C, and A B) persons A, D, and D C) persons B, C, and D D) persons B, A, and B

B.) Decreases

34. As sample size increases, the standard error of the mean A) increases B) decreases C) can increase or decrease D) does not change

D.) both B and C

35. The sample variance is an unbiased estimator of the population variance A) when dividing SS by n B) when dividing SS by df C) when dividing SS by n - 1 D) both B and C

C.) They both have the same standard error

36. The following samples were selected by two researchers. Which is associated with a smaller standard error of the mean? Researcher A: n = 25, µ= 5, δ = 7 Researcher B: n = 25, µ= 32, δ = 7 A) Researcher A B) Researcher B C) They both have the same standard error.

A.) True

39. The standard error of the mean is the standard deviation in a sampling distribution of sample means. A) True B) False

A.) True

26.For a set of data with 25±2.5, at least 95% of scores fall between 20 and 30. A)True B)False

D.) The large of large numbers

37. Increasing the number of observations or samples in a study will decrease the standard error (standard error of the mean). This is known as A) Bob (not the right answer) B) the law of diminishing returns C) the theoretical law of estimtates D) the law of large numbers

A.) True

38. A researcher selects a sample of 625 participants from a population with a mean of 120 and a standard deviation of 25. The probability of selecting a sample mean that is larger than 125 is close to zero. A) True B) False

C.) 9 and 10

46. A researcher selects a sample of 9 participants from a population with a mean of 8 and a standard deviation of 3. About 14% of the sample means in this sampling distribution should be between a sample mean of A) 6 and 8 B) 5 and 6 C) 9 and 10 D) 10 and 11

A.) True

49. The average sample variance equals the population variance when dividing SS by df. A) True B) False

D.) .25

50. A researcher records the following data for the number of bids made on a sample of items sold at an auction. Based on the table, what was the probability that an item had 7 bids made on it? Number of Bids Frequencies 3 5 4 12 5 7 6 6 7 10 A) 5 B) 10 C) .10 D) .25