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) Check the
normality assumption. *(c) Use MINITAB to estimate a confidence interval
without assuming normality. (Data are from Science News 154, no. 19, p. 294.)
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