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A random sample of 19 size AA batteries for toys yield a mean of 2.62 hours...

A random sample of 19 size AA batteries for toys yield a mean of 2.62 hours with standard deviation, 0.95 hours.

(a) Find the critical value, t*, for a 99% CI. t* =

(b) Find the margin of error for a 99% CI.

math   Statistics-And-Probability   
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