Question

3.   A psychologist is interested in the effects of social pressure. She selects a group of    10 male subjects at random from her introductory psychology course. Each subject    is asked to estimate by eye the length of a stick under two conditions. In one    condition,    the subject is placed in the presence of four other persons who,
   unknown to him, have been instructed to give estimates that are too large. Each of
   these persons gives his estimate orally to the experimenter before the subject is
   asked for his estimate. In the other condition, the same procedure is employed,
   except that the other four persons present are told to give honest estimates. For
   each subject, the order of the two conditions is determined randomly. Estimates
   (in inches) made by each subject under both conditions are given below.

               ESTIMATES MADE           ESTIMATE MADE
               IN UNBIASED              IN BIASED
               ENVIRONMENT              ENVIRONMENT

SUBJECT

   1                       38                       47
  
   2                       35                       45

   3                       37                       42

   4                       40                       45

   5                       45                       47

   6                       34                       40

   7                       40                       43

   8                       36                       45

   9                       43                       40

10                       41                       48

Complete the test of no difference between mean estimates. Use a significance level of .05.

Answer 1