Below are data from an experiment examining the effects of threatening images on a person's altruism tendencies.
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Below are data from an experiment examining the effects of threatening images on a person's altruism tendencies.

Participants were randomly assigned to either a no threatening image or a threatening image group and were then asked to fill out a questionnaire that assessed their tendency toward altruism. The data are presented below.

  1. 1) Based on the total sample size (and degrees of freedom) use the attached t table to determine the critical values of the t distribution.
  2. 2) Calculate the t statistic. You must show all of your work (please attach a separate sheet).
  3. 3) Can you reject H0?

participant no threat threat

1 54 59

2 65 79

3 47 78

4 60 78

5 63 69

6 49 73

7 72 69

8 53 75


∑X

∑X2

Mean

 

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