#07

Find the minimum sample size n needed to estimate for the given values of c,

,and E.

c=0.95,

=6.4,

and E= 2

Assume that a preliminary sample has at least 30 members.

n=________ (round to the nearest whole number)

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#08

Use the confidence interval to find the estimated margin of error. Then find the sample mean.A biologist reports a confidence interval of(3.8,5.2) when estimating the mean height (in centimeters) of a sample of seedlings.

The estimated margin of error is ________