Cost of Pizzas A pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How large should the sample be ifshe wishes to be accurate to within $0.16? A previous study showed that the standard deviation of the price was $0.48. Round your final answer up to the nextwhole number.The owner needs at least a sample ofpizzas. Water Temperature If the variance of the water temperature in a lake is 26°, how many days should the researcher select to measure the temperature toestimate the true mean within 3° with 99% confidence? Round the intermediate calculations to two decimal places and round up your final answer to the nextwhole number.The researcher needs a sample of at leastdays.XŚ

Margin of error(E)=0.16Standard deviation()=0.48

Answered: Cost of Pizzas A pizza shop owner…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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K You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A random sample of 35 home theater systems has a mean price of $131.00. Assume the population standard deviation is $15.50. Construct a 90% confidence interval for the population mean. The 90% confidence interval is (). (Round to two decimal places as needed.) W
Section b
You work for a soft-drink company in the quality control division. You are interested in the standard deviation of one of your production lines as a measure of consistency. The product is intended to have a mean of 12 ounces, and your team would like the standard deviation to be as low as possible. You gather a random sample of 14 containers. Estimate the population standard deviation at a 90% level of confidence. 12.07 11.96 11.93 12.16 12.06 11.9 12.06 12.21 11.86 12.03 11.86 11.83 11.99 12.09 (Data checksum: 168.01) Note: Keep as many decimals as possible while making these calculations. If possible, keep all answers exact by storing answers as variables on your calculator or computer. a) Find the sample standard deviation: b) Find the lower and upper χ2χ2 critical values at 90% confidence:Lower: Upper: c) Report your confidence interval for σσ: ( , )
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b My Questions | bartleby W How To Delete Bartleby Accou X + -m/courses/20952/assignments/284250 In a survey, 24 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $30 and standard deviation of $6. Construct a confidence interval at a 95% confidence level. Give your answers to one decimal place. Question Help: Message instructor Submit Question OCT étv S 1,454 26 MacBook Air DI DD 20 888 F8 F9 F6 F7 F4 F5 F2 F3
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 41 business days, the mean closing price of a certain stock was $124.74 Assume the population standard deviation is $10.58 The 90% confidence interval is (,). (Round to two decimal places as needed.)
Cost of Pizzas A pizza shop owner wishes to find the 90% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.17 ? A previous study showed that the standard deviation of the price was $0.45 . Round your final answer up to the next whole number. The owner needs at least a sample of pizzas. ?
Cost of Pizzas A pizza shop owner wishes to find the 90% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.14? A previous study showed that the standard deviation of the price was $0.34. Round your final answer up to the next whole number. The owner needs at least a sample of pizzas. X
Cost of Pizzas A pizza shop owner wishes to find the 99% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.14? A previous study showed that the standard deviation of the price was $0.18. Round your final answer up to the next whole number. The owner needs at least a sample of pizzas.
For data of discussion 1 refer to this picture What is the best point estimate for your survey question that you used in Discussion 1? Be sure to include both the correct notation (symbol) and the value. Construct a confidence interval for the responses to your survey. Assume that you do not know the population standard deviation. Indicate your level of confidence and the corresponding critical value. What is the margin of error? If we would increase the sample size to 500 students, what would happen to your margin of error?
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You work for a soft-drink company in the quality control division. You are interested in the standard deviation of one of your production lines as a measure of consistency. The product is intended to have a mean of 12 ounces, and your team would like the standard deviation to be as low as possible. You gather a random sample of 15 containers. Estimate the population standard deviation at a 80% level of confidence. 11.86 12.12 12.2 12.08 12.06 12.09 11.92 12.26 12.04 12.1 11.85 11.97 11.85 12 12.01 (Data checksum: 180.41) Keep as many decimals as possible while making these calculations. a) Find the sample standard deviation: b) Find the lower and upper χ2χ2 critical values at 80% confidence:Lower: Upper: c) Report your confidence interval for σσ:

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