Using the internet on a computer: The Nielsen Company reported that US residents aged 18 to 24 years spend an average of 32.5 hours per month using the Internet on a computer. You wonder if this is true at SMU because so many students use their smartphones to access the internet. You collect a simple random sample of n=75 SMU students and obtain x-bar=28.5 hours with s=23.1 hours. Report the 95% confidence interval for the true average number of hours per month SMU students use their computers to access the internet. Fill in the blanks for the lower and upper limit. Round to one decimal place. Lower limit= Upper limit= Question 7: What is the correct value to use for a 95% confidence when n=50? Finding a t* (critical value):
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7.30 Using the Internet on a computer. The Nielsen Company reported that U.S. residents aged 18 to 24 years spend an average of 32.5 hours per month using the Internet on a computer. You wonder if this it true for students at your large university because so many students use their smartphones to access the Internet. You collect an SRS of n = 75 students and obtain x̄ = 28.5 hours with s = 23.1 hours. (a) Report the 95% confidence interval for μ, the average number of hours per month that students at your university use the Internet on a computer. (b) Use this interval to test whether the average time for students at your university is different from the average reported by Nielsen. Use the 5% significance level. Summarize your results.
Joshua A.
Sri K.
A community college instructor wanted to check if the amount of time they estimated to complete online homework weekly was accurate for all of the students they taught. In a sample of 25 currently enrolled students, the mean amount of time the sample spent working on online homework weekly was 18.4 hours. Assume the population of weekly time spent on online homework is normally distributed with a population standard deviation of 5.1 hours. Create a 99% confidence interval estimate for the true population mean amount of time spent weekly working on online homework. Fill in the following blanks by computing the lower and upper boundaries for the confidence interval. Round your final answer to one decimal place (to the nearest tenth). Only type in your numerical decimal answer, you do not need units/hours. ____________ hours < ÎĽ < ____________ hours
David N.
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