Construct a 95% confidence interval to estimate the population mean using the data below. x= 46 0= 10 n= 37 With 95% confidence, when n = 37 the population mean is between a lower limit of and an upper limit of (Round to two decimal places as needed.)
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- (f) Find a 90% confidence interval for each coefficient. (Use 2 decimal places.) lower limit upper limit β2 β3 (g) Suppose Michael is 68 years old and weighs 192 pounds. Predict his systolic blood pressure, and find a 90% confidence range for your prediction. (Use 1 decimal place.) prediction lower limit upper limitConstruct a confidence interval of the population proportion at the given level of confidence. x=540, n=1100, 96% confidence what is the lower and upper bound?A statistics practitioner took a random sample of 57 observations from a population whose standard deviation is 25 and computed the sample mean to be 103. Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. A. Estimate the population mean with 95% confidence. Confidence Interval = B. Estimate the population mean with 95% confidence, changing the population standard deviation to 58; Confidence Interval = C. Estimate the population mean with 95% confidence, changing the population standard deviation to 7; Confidence Interval =
- A New York Times article reported that a survey conducted in 2014 included 36,000 adults, with 3.66% of them being regular users of e-cigarettes. Because e-cigarette use is relatively new, there is a need to obtain today's usage rate. How many adults must be surveyed now if a confidence level of 95% and a margin of error of 2 percentage points are wanted? Complete parts (a) through (c) below. a. Assume that nothing is known about the rate of e-cigarette usage among adults. n=enter your response here (Round up to the nearest integer.) b. Use the results from the 2014 survey. n=enter your response here (Round up to the nearest integer.)A New York Times article reported that a survey conducted in 2014 included 36,000adults, with 3.71%of them being regular users of e-cigarettes. Because e-cigarette use is relatively new, there is a need to obtain today's usage rate. How many adults must be surveyed now if a confidence level of 95% and a margin of error of 3 percentage points are wanted? Complete parts (a) through (c) below. a. Assume that nothing is known about the rate of e-cigarette usage among adults. n=. (enter your response here ) (Round up to the nearest integer.) Part 2 b. Use the results from the 2014 survey. n=. (enter your response here) (Round up to the nearest integer.) Part 3 c. Does the use of the result from the 2014 survey have much of an effect on the sample size? A. Yes, using the result from the 2014 survey only slightly increases the sample size. B. Yes, using the result from the 2014 survey dramatically reduces the sample size. C. No, using the…Construct a confidence interval of the population proportion at the given level of confidence. x=120, n=1200, 96% confidence What is the lower bound of confidence? What is the higher bound of confidence?
- A researcher wants to estimate the actual proportion of citizens of a certain country who feel that the president does an acceptable job after 30 months in office. His estimate will be with a 99% confidence interval. How many individuals must the researcher interview if he wants his estimate to be within 2%? Write your answer without using commas.Construct a 90% confidence interval to estimate the population proportion with a sample proportion equal to 0.35 and a sample size equal to 120. A 90% confidence interval estimates that the population proportion is between a lower limit of ____?____and an upper limit of ____?____A New York Times article reported that a survey conducted in 2014 included 36,000 adults, with 3.72% of them being regular users of e-cigarettes. Because e-cigarette use is relatively new, there is a need to obtain today's usage rate. How many adults must be surveyed now if a confidence level of 90% and a margin of error of 2.5 percentage points are wanted? Complete parts (a) through (c) below. a. Assume that nothing is known about the rate of e-cigarette usage among adults. n = ____________ b. Use the results from the 2014 survey. n = ______________
- Thirty-two small communities in Connecticut (population near 10,000 each) gave an average of x = 139.4 reported cases of larceny per year. Assume that ? is known to be 42.9 cases per year. (a) Find a 90% confidence interval for the population mean annual number of reported larceny cases in such communities. What is the lower limit?(Round your answers to one decimal place.)A statistics practitioner took a random sample of 43 observations from a population whose standard deviation is 30 and computed the sample mean to be 109. Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. A. Estimate the population mean with 95% confidence. Confidence Interval = B. Estimate the population mean with 90% confidence. Confidence Interval = C. Estimate the population mean with 99% confidence. Confidence Interval =Construct a 95% confidence interval of the population proportion using the given information. x=45, n=150 The lower bound is The upper bound is