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. 3) What is the rationale behind using n‐1 in calculating the sample standard deviation instead of just N? 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? 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
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