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Exam 1 - PSY 211

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Exam 1 - PSY 211 ...

Exam 3 - PSY 211 Name: _____________________________

    Course Reference #22021132

    Mike Hoerger

Section I. Multiple Choice [40 points]

1 Range of Z scores:

    a) -? to ?

    b) -1 to 1

    c) -4 to 4

    2 On a history exam you earn a Z score of -1. On a math exam, you earn a Z

    score of +1. On which exam would you have a higher raw score? a) history

    b) math

    c) not enough information

3 Of the following three sampling distributions, which would have the greatest

    variability?

    a) Distribution of heights of Americans

    b) Distribution of sample means of heights of Americans, where n = 2

    c) Distribution of sample means of heights of Americans, where n = 10,000

    4 Which of the following is farthest from the mean? a) Z = -0.5

    b) T = 40

    c) IQ = 110

    5 For the distribution of sample means, a Z score is calculated as follows: a) Z = (X M) / (SD)

    b) Z = (M μ) / (SE)

    c) nZ = (X μ) / (SE / )

6 The standardized distance an individual score varies above or below the mean:

    a) Standard error of the mean

    b) Z score

    c) Sampling error

7 σ =

    a) nSE *

    b) n / SE

    c) n(X M) /

    8 In art, you earn a raw score of 80 on the final exam (M = 75). In chemistry, you

    earn a raw score of 90 on the final exam (M = 40). On which exam would you

    have a higher Z score?

    a) art

    b) chemistry

    c) not enough information

9 Discrepancy between a sample statistic and a population parameter:

    a) Standard error of the mean

    b) Z score

    c) Sampling error

10 According to the 68-95-99 rule:

    a) p(Z < 1) = 68%

    b) p(-1 < Z < 1) = 68%

    c) p(Z < -2) = 68%

    11 Which of the following is closest to the mean? a) Z = 6

    b) T = 10

    c) IQ = 130

    12 On the MMPI-2 survey of psychopathology, your friend scores a T score of 60

    on the depression scale and a T score of 90 on the anxiety scale. On which

    scale would your friend have a higher Z score? a) depression

    b) anxiety

    c) not enough information

    13 Mental retardation is generally diagnosed when someone has an IQ of less

    than 70. If a random community of 10,000 people were all given IQ tests,

    about how many people would be diagnosed as mentally retarded?

    a) 222

    b) 22

    c) 2

14 Three patients come in for physical therapy and are given surveys measuring

    their level of pain and self-efficacy. Who will take the shortest time to treat?

    a) Client A. Pain: T = 71. Self-efficacy: Z = 0.64 b) Client B. Pain: T = 33. Self-efficacy: Z = -1.21 c) Client C. Pain: T = 36. Self-efficacy: Z = 0.51

15 Having a T score of 83 on a agreeableness survey would indicate:

    a) very low level of agreeableness

    b) fairly average level of agreeableness

    c) very high level of agreeableness

    16 If the frequency distribution for “wealth” were put on a Z distribution, its shape

    would be:

    a) positively skewed

    b) normal

    c) negatively skewed

    Section II. Calculations Provide at least ONE decimal place [40 points]

17. The average college textbook has 614 pages (standard deviation = 88 pages).

    a) Your statistics textbook has 746 pages. Convert this score to the Z scale, T

    scale, and IQ scale. Find the percentile rank.

    Z = (746-614) / 88 = 1.5 T = 65 IQ = 122.5 93.3%

    b) Your philosophy textbook has 570 pages. Convert this score to the Z scale, T

    scale, and IQ scale. Find the percentile rank.

    Z = (570-614) / 88 = -0.5 T = 45 IQ = 92.5 30.9%

    18. Find the percentile rank for each of the following Z scores:

     a) Z = -0.21 41.7%

     b) Z = 1.48 93.1%

    19. If you administer a typical IQ test to a small random sample (n = 30), what would be the standard error of the mean?

     SE = SD / sqrt(n) = 15 / sqrt(30) = 2.7

    20. What is the probability of rolling a 2 or lower on a standard die?

     1 / 3 or 0.33 or 33.3%

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