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Given a periodic sample of 30 from a population of 500 with a sample average of...

Given a periodic sample of 30 from a population of 500 with a sample average of 12.125 and sample standard deviation of 0.125, what 90% confidence interval for the true average of the entire population?

What is the 90% confidence interval for the true average for a population if 12 samples were measured with and average of 1.257 and a standard deviation of 0.034?

Given 30 samples which have an average length of 15.427 with a standard deviation of 0.0035, what is the %Probability of acceptance for the entire population if the desired tolerance is 15.425±0.010

What is the 90% confidence interval for the true mean of the previous problem, average length of 15.427 with a standard deviation of 0.0035?

If the previous problem had only 8 samples, average length of 15.427 with a standard deviation of 0.0035, what is the %Probability of acceptance for the entire population if the desired tolerance is 15.425±0.010, hint: you must interpolate between level of significance values in the t-table

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