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# One sample Z test

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A Survey is conducted to determine the mean number of minutes per day that teens between the age of 16 and 18 spend watching television per day. A previous study showed that the population standard deviation was 21.5 minutes. The organization selected a random sample of n = 200 teens between the ages of 16 and 18 and recorded the number of minutes of TV that each person watched on a particular day. The mean time was 191.3 minutes. If the leaders of the organization wish to develop an interval estimate with 98 percent confidence, what critical value should be used?

https://brainmass.com/statistics/z-test/one-sample-test-mean-235473

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Critical value
A Survey is conducted to determine the mean number of minutes per day that teens between the age of 16 and 18 spend watching television per day. A previous study showed that the population standard deviation was 21.5 minutes. The organization selected a ...

#### Solution Summary

The solution provides step by step method for the calculation of Z test. . Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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