Acoustomagnetic surveillance antitheft portals (the kind used to prevent shoplifting) temporarily affected the pacemakers in 48 out of 50 subjects tested. (a) Construct a 90 percent confidence interval for the proportion of all subjects whose pacemakers would be affected. (b) What problems of interpretation arise? (c) Check the normality assumption. If not met, what could we do? (d) Use MINITAB to estimate a confidence interval without assuming normality. (Data are from Science News 154, no. 19, p. 294.)
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