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Confidence Interval for mean

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1. A sample of 100 elementary school children revealed that the average number of hours per week spend watching TV for the sample was 18.5 hours with a standard deviation equal to 2.5 hours. Find a 90% confidence interval for the mean time spend watching TV for the population from which the sample was selected.

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The expert finds a 90% confidence interval for the mean time spend watching TV.

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1. A sample of 100 elementary school children revealed that the average number of hours per week spend watching TV for the sample was 18.5 hours with a standard deviation equal to 2.5 hours. Find a 90% confidence interval for the mean time spend watching TV for the population from which the sample was ...

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