Midterm 1 - Version B - Multiple Choice

# Midterm 1 - Version B - Multiple Choice -...

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Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10 1 P SYCHOLOGY 60 S PRING , 2010 MIDTERM 1 Tuesday, April 20th, 2010 FULL NAME ___________________________________________________________________________________ STUDENT ID __________________________________________________________________________________ Please put your name and ID number on this page AND on the Scantron form. VERSION B

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Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10 3 1) One item on a questionnaire asks, “How many siblings (brothers and sisters) do you have?” A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately describes the measures of central tendency? a. because the scores are all whole numbers, the mean will be a whole number b. because the scores are all whole numbers, the median will be a whole number c. because the scores are all whole numbers, the mode will be a whole number* d. because the scores are all whole numbers, the mean and median will have the same value e. all of the above are correct descriptions 2) If it is not possible to divide the existing categories of a variable, then it is an example of a _________ variable. a. construct b. independent c. dependent d. continuous e. discrete* 3) What is the rationale behind using n‐1 in calculating the sample standard deviation instead of just N? a. None, you can use either equation interchangeably b. n‐1 removes any potential outliers in the sample which could exaggerate the variance c. n‐1 will yield a larger result, which is a better reflection of the standard deviation of the population* d. n‐1 yields a smaller result, which is a better reflection of the standard deviation of the population e. Both b and d 4) The value of one score in a distribution is changed from X = 20 to X = 30. Which measure(s) of central tendency is (are) certain to be changed? a. the mean* b. the median c. the mean and the median d. the mode e. cannot determine from the information given 5) If every score in a population with μ = 60 and σ = 8 is transformed into z‐scores, then the resulting distribution of z‐scores will have a mean of ____ and a standard deviation of ____. a. 0 and 1* b. 60 and 1 c. 0 and 8 d. 60 and 8 (unchanged) e. cannot determine from the information given

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Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10 4 6) Which of the following students scored highest on his/her quiz relative to the other students in his/her class? (Each of the five students took quizzes in different classes.) a. Allen: Score = 65. Quiz mean = 80. Z‐score = ‐5.
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Midterm 1 - Version B - Multiple Choice -...

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