Psychologists have found that people are generally reluctant to transmit bad news to their peers. This phenomenon has been named the MUM effect
To investigate the cause of the MUM effect, undergraduates at a university participated in an experiment. Each subject was asked to administer an IQ test to another student and then provide the test taker with his or her percentile score. (Unknown to the subject, the test taker was a bogus student who was working with the researchers.) The experimenters manipulated two factors, subject visibility and success of test taker, each at two levels. Subject visibility was either visible or not visible to the test taker. Success of test taker was either top 20 or bottom 20. Ten subjects were randomly assigned to each of the 2 x 2 = 4 experimental conditions. Then the time (in seconds) between the end of the test and the delivery of the percentile score from the subject to the test taker was measured. (This variable is called the latency to feedback.) What type of experimental design was employed in this study?
A) randomized block design with four treatments and 10 blocks
B) completely randomized design with four treatments
C) 2 x 2 factorial design with 10 replications
D) 4 x 20 factorial design with no replications
Question 2
It is desired to estimate the average time it takes Statistics students to finish a computer project to within two hours at 90 reliability. It is estimated that the standard deviation of the times is 14 hours.
How large a sample should be taken to get the desired interval?
A) n = 133 B) n = 189 C) n = 325 D) n = 231
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