In 1974, the Oregon Department of Transportation collected data concerning the effect of the energy (gasoline) shortage on the behavior of drivers in Portland, Oregon. The data are given in Table...

In 1974, the Oregon Department of Transportation collected data

concerning the effect of the energy (gasoline) shortage on the

behavior of drivers in Portland, Oregon. The data are given in

Table 6.5.i.

(a) Estimate the proportion indicating no change and find a

95% confidence interval for this population proportion.

(b) Among those who altered their behavior, estimate the proportion "Who reduced automobile travel, and find a 95%

confidence interval as in part (a).