Cost of Pizzas A pizza shop owner wishes to find the 90% confidenceinterval of the true mean cost of a large plain pizza. How large shouldthe sample be if she wishes to be accurate to within $0.14? A previousstudy showed that the standard deviation of the price was $0.34. Roundyour final answer up to the next whole number.The owner needs at least a sample ofpizzas.X

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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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Suppose you calculate a z-score of -2.2 and the distribution is normal. Then which of the following is a correct interpretation? Group of answer choices None of the above are justified interpretations The observation is about 2.2 standard deviations less than the mean. This means it is less than all but roughly 2.5% of the observations. The observation is about 2.2 times the variance less than the mean. This means it is less than all but roughly 5% of the observations The observation is about 2.2 times the variance less than the mean. This means it is less than all but roughly 2.5% of the observations. The observation is about 2.2 standard deviations less than the mean. This means it is less than all but roughly 5% of the observations.
In a survey, 23 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $47 and standard deviation of $9. Construct a confidence interval at a 80% confidence level.Give your answers to one decimal place.________ ± ________Interpret your confidence interval in the context of this problem.
Section b
Data from a state indicate that scores on the SAT test are normally distributed with a mean of 994 and a standard deviation of 204. Scores on the ACT test are normally distributed with a mean of 20 and a standard deviation of 5.1. It is assumed that the two tests measure the same aptitude, but use different scales.If a student gets an SAT score that is the 77 percentile, find the actual SAT score. Round answer to a whole number. SAT score = What would be the equivalent ACT score for this student? Round answer to 1 decimal place. ACT score = If a student gets an SAT score of 1280, find the equivalent ACT score. Round answer to 1 decimal place. ACT score =
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
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. ?
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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.
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 a random sample of 49 business days, the mean closing price of a certain stock was $114.41 Assume the population standard deviation is $11.35
Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 169 ward areas was 60.3 decibels, and the population standard deviation is 6.1 . Find the 96% confidence interval of the true mean. Use a graphing calculator and round the answers to one decimal place.
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 18 containers. Estimate the population standard deviation at a 80% level of confidence. 12.08 12 12.1 11.98 12.1 12.09 11.91 12.01 11.95 12.12 12 12.1 11.97 11.95 12.07 12.1 11.96 12.02 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 χ2 critical values at 80% confidence:Lower: Upper: c) Report your confidence interval for σ: ( , )
In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $44 and standard deviation of $6. Construct a confidence interval at a 98% confidence level.Give your answers to one decimal place._______________ ± _______________Interpret your confidence interval in the context of this problem.

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