HOURS SPENT ON WATCHING TELEVISION A researcher wants to estimate the number of hours that 5-year-old children spend watching television. A sample of 50 five-year-old children was observed to have a mean viewing time of 3 hours and a standard deviation of 0.4. The population is normally distributed with a population standard deviation a=0.5 hours, find a. The best point estimate of the population mean b. The 95% confidence interval of the population mean Solution A. POINT ESTIMATE STEPS 1. Describe the population parameter of interest 2. Specify the confidence interval criteria. a. Check the assumptions. b. Determine the test statistic to be used to calculate the interval. c. State the level of confidence. 3. Collect and present sample evidence a. Collect the sample information. b. Find the point estimate. B. 95% CONFIDENCE INTERVAL STEPS 1. Determine the confidence interval a. Determine the confidence coefficient. b. Find the maximum error E. c. Find the lower and the upper confidence limits. d. Describe the results. SOLUTION SOLUTION

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