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A survey was taken of 383 students that asked the question how much time they spent...

A survey was taken of 383 students that asked the question how much time they spent watching television in a day (in minutes). Suppose this sample study follows a Normal distribution with a sample mean x-bar = 118 minutes. Also suppose the population has a standard deviation σ = 53 minutes. Determine a 96% confidence interval for the mean television watching time.

A. 112.67 to 123.31

B. 117.86 to 118.14

C. 112.44 to 123.56

D. 111.70 to 124.30

Math   Statistics-And-Probability   
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Answer #1

Since , the population standard deviation is known.

Therefore , use normal distribution.

Now , ; From standard normal distribution table

Therefore , the

96% confidence interval for the mean television watching time is ,

Correct option s (C)

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