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Please help with the following problem. Provide calculations and explanations.

The mean interview time for a standard questionnaire of 31.3 minutes was considered to be excessive so the schedule was revised, yielding a mean interview time for a sample of 40 subjects of 21.3 minutes, with a standard deviation of 1.5 minutes. Have the researchers significantly reduced the interview times?

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This post helps with a statistics problem. Step by step method for testing the hypothesis under 5 step approach is discussed here. Excel template for each problem is also included. This template can be used to obtain the answers of similar problems.

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Problem: schedule was revised, yielding a mean interview time for a sample of 40 subjects of 21.3 minutes, with a standard deviation of 1.5 minutes. Have the researchers significantly reduced the interview times?

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The mean interview time for a standard questionnaire of 31.3 minutes was considered ...

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