Assignment 2

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gnyx2jneelo

Mathematics

CUNY Borough of Manhattan Community College

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Construct a 99% confidence interval of the population proportion using the given information. x= 125, n = 250 The lower bound is The upper bound is (Round to three decimal places as needed.) Determine the point estimate of the population mean and margin of error for the confidence interval. Lower bound is 19, upper bound is 25. The point estimate of the population mean is The margin of error for the confidence interval is Suppose the null hypothesis is rejected. State the conclusion based on the results of the test. Three years ago, the mean price of a single-family home was $243,715. A real estate broker believes that the mean price has increased since then. Which of the following is the correct conclusion? O A. There is not sufficient evidence to conclude that the mean price of a single-family home has increased. B. There is sufficient evidence to conclude that the mean price of a single-family home has increased. OC. There is sufficient evidence to conclude that the mean price of a single-family home has not changed. OD. There is not sufficient evidence to conclude that the mean price of a single-family home has not changed. Suppose a least-squares regression line is given by ý = 4.302x-3.293. What is the mean value of the response variable if x=20? (Round to one decimal place as needed.) H 120
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