Question

For a confidence level of 98% with a sample size of 28, find the critical t value.

Critical Value =

(round answer to 3 decimal places)

Assume that a sample is used to estimate a population mean μμ. Find the 99.9% confidence interval for a sample of size 33 with a mean of 72.3 and a standard deviation of 12.1. Enter your answer accurate to one decimal place.

I am 99.9% confident that the mean μμ is between  and

Assume that a sample is used to estimate a population mean μμ. Find the 99.5% confidence interval for a sample of size 29 with a mean of 24.3 and a standard deviation of 16.9. Enter your answer accurate to one decimal place.

I am 99.5% confident that the mean μμ is between  and

Answer 1

# for confidence 98% level of significance will be 0.02 and degrees of freedom will be 27

T-Value (two-tailed): +/- 2.47266

so critical value is 2.473

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