Playground, act two The survey described in Exercise 20 asked, Many people believe this playground is too small and in need of repair. Do you think the playground should be repaired and expanded even if that means raising the entrance fee to the park? Describe two ways this question may lead to response bias.
Chapter 13 ---- Comparing Two Means Comparing two means with the “Two Sample t-Test” (Two Independent Samples Design) Take two groups of people (items) randomly and take one measurement per person. These groups have not been matched up by any criterion but rather the people selected in group 1 are selected independently of the people in group 2. The people selected in group 1 do not influence in any way those selected in group 2. Example 1: Is a new teaching method more effective than the old method Select 20 people at random to be assigned to a class using the new method and select another 20 people at random to be in the old method group. The people in the two groups were not matched up by any criterion but rather simply taken from the same population at ra