1. A 2003 CBS News poll sampled 523 adults who were planning a vacation during the next 6 months, and found that 141 were expecting to travel by airplane. A similar survey in May 1993 reveled that of 477 adults who were planning a vacation in next 6 months, 81 were planning to travel by airplane.

If the computed value for this problem is +3.79 and the level of significance is 0.01, can we conclude the percentage of people who plan to travel  by plane for vacations has changed from 1993 to 2000?

2. A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the previous 3- year period. The results were as follows:

Single Policyholders                             Married  Policyholders

n₁ = 400                                                           n₂ = 900

Number making claims = 76                     Number making claims = 90

Using alpha = 0.05 and a computed value of +4.49, can we conclude that the percentage of claims for married policyholders is less then for single policyholders?