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1. Among various ethnic groups, the standard deviation of heights is known to be approximately three...

1. Among various ethnic groups, the standard deviation of heights is known to be approximately three inches. Construct a 90% confidence interval for the mean height of male Russians based on the sample size forty where the sample mean was 68 includes and the sample standard deviation is 3.32 inches. SHOW CALCULATOR INPUT THANK YOU

2. Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 50 people. The sample mean is 17.4 hours and the sample standard deviation of 6.2 hours. Based on this data, construct a 95% confidence interval. for the time to complete one person's tax return. SHOW CALCULATOR INPUT. THANK YOU.

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