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Test 3 - Stat 200



Test 3 - Stat 200

Solution

is the best point estimate for , therefore, the best point estimate of the population mean is with

Now, for 95% confidence interval,

To find the area under the normal curve = .4750, the corresponding z value for this area is 1.96.

55.352 < 62.397

Solution



Therefore, to be 90% confident that the estimate is within $150 of the true mean monthly salary, the researcher needs a sample size of at least 147 sports reporters.

Solution

Let = Average number of chocolate pallets

H0: = 30 decigrams

HA: > 30 decigrams

Zcal = = 2.16

Ztab ...