Question
1. Find the critical value z /2 needed to construct a confidence interval with level 82%. Round the answer to two decimal places. 2. A
1. Find the critical value z/2 needed to construct a confidence interval with level 82%.
Round the answer to two decimal places.
2. A sample of size n= 70 is drawn from a normal population whose standard deviation is =6.2. The sample mean is x=46.21.
(a) Construct a 80% confidence interval for . Round the answer to at least two decimal places.
(b) If the population were not approximately normal, would the confidence interval constructed in part (a) be valid? Explain.
- The confidence interval constructed in part (a) ____ be valid since the sample size _____ large.
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