Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 100people. The sample average is 22.7 hours. There is a known population standard deviation of 7.0 hours. The population distribution is assumed to be normal. x =   σ = σ x =    n = n − 1 = Which distribution should you use for this problem? (Round your answers to two decimal places.) X

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.