7. A sample of 35 teens aged 15-18 years showed an average of 2.9 hours of cell phone use per day with a standard deviat
Posted: Sun Jul 10, 2022 10:22 am
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7. A sample of 35 teens aged 15-18 years showed an average of 2.9 hours of cell phone use per day with a standard deviation of 0.5 hours. (15 points) a. Find a 90% confidence interval for a number of hours per day teens in this age group spend using cell phone. (10 points). b. If you increase the confidence level, will the confidence interval estimate be wider or narrower? Explain. (5 points)