1. A researcher wants to estimate the proportion of secretaries of Fortune 500 c

1. A researcher wants to estimate the proportion of secretaries of Fortune 500 companies who have personal computers at their workstations. How large should the sample be if the researcher is to be 95% confident that the difference between the sample estimate and the actual proportion is no more than ±2%? 2. The Excel file Baseball Attendance shows the attendance in thousands at San Francisco Giants’ baseball games for the 10 years before the Oakland A’s moved to the Bay Area in 1968, as well as the combined attendance for both teams for the next 11 years. a. Do the data appear to be stationary? b. Develop 95% confidence intervals for the mean attendance of each of the two groups. Based on these confidence intervals, would you conclude that attendance has changed after the move?

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