Need answers to 724 and 725 pleaseSolutionPlease attached th

Need answers to 7.24 and 7.25 please.

Solution

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The distribution is slightly right-skewed, and the largest observation stands out from the rest (although it does not quite qualify as an outlier using the 1.5×IQRrule).(b)The reasonably large sample should be sufficient to overcome the mild non-Normality of the data, and because it was based on a random sample from a large population, t procedures should be appropriate.

(c) x.=119.0667 and s.=29.5669 friends, so the standard error is

s/30.=5.3982. The critical value for 95% confidence is t=2.045, so the margin of error is 11.04.