A research firm conducted a survey to determine the mean repair cost onrefrigerators. They found that the distribution of repair costs followed the normaldistribution with a population standard deviation of $12.22. A random sample of 50refrigerators had a mean repair cost of $73.00.Round your answer in part (a) to 2 decimal places.(a) What is the critical z-value that will need to be used to calculate the 95%confidence interval?Round your answers in part (b) to 2 decimal places.(b) What is the 95% confidence interval?<μ <Round your answer in part (c) to 2 decimal places.(c) What is the critical z-value that will need to be used to calculate the 98%confidence interval?Round your answers in part (d) to two decimal places.(d) What is the 98% confidence interval?PrivaTern< µ <

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Answered: A research firm conducted a survey to…

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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In a random sample of 38 families, the average weekly food expense was $95.60 with a standard deviation of $22.50. the distribution of weekly food expenses is normally distributed. Find the 99% confidence interval for the average weekly food expense. Round to two decimal places.
supervisor records the repair cost for 17 randomly selected TVs. A sample mean of $76.76and standard deviation of $24.02 are subsequently computed. Determine the 99% confidence interval for the mean repair cost for the TVs. Assume the population is approximately normal. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
Salaries of 40 college graduates who took a statistics course in college have a mean, x overbar, of $64,200. Assuming a standard deviation, σ, of $12,042, construct a 95% confidence interval for estimating the population mean μ.
In a survey, 373 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $36.85 and standard deviation of $19.05. Estimate how much a typical parent would spend on their child's birthday gift (use a z-interval at a 80% confidence level). Give your answers to 2 decimal places. Express your answer in the format of E. $ + $
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In a random sample of 60 refrigerators, the mean repair cost was $111.00 and the population standard deviation is $16.40. Construct a 95% confidence interval for the population mean repair cost. Interpret the results. Construct a 95% confidence interval for the population mean repair cost. The 95% confidence interval is ( D. (Round to two decimal places as needed.)
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 $0.15? A previous study showed that the standard deviation of the price was $0.16. Round your final answer up to the next whole number.
## In a survey of adults with diabetes, the average body mass index (BMI) in a sample of 1938 women was 32.2 with a standard deviation of 0.03. The BMI in a sample of 1555 men was 30.4, with a standard deviation of 0.06. Construct a 92% confidence interval for the difference in the mean BMI between women and men with diabetes, INTERPRET THE RESULTS. DOES THE CONFIDENCE INTERVAL CONTRADICT THE CLAIM THAT THE MEAN BMI IS THE SAME FOR BOTH MEN AND WOMEN WITH DIABETES?
Could you show your work to reach the solution?
The number of peanuts in a 16 ounce can of nut munchies is normally distributed with a mean of 93.6 and a standard deviation of 4.2 peanuts the number of peanuts in a 20 ounce can of gone nuts is normally distributed with a mean of 111.8 and a standard deviation of 3.4 peanuts. (a) Carmen purchased a 16 ounce can of nut munchies and counted 100 peanuts what is the Z score for this can of peanuts? (b) Angelo purchased a 20 ounce can of gone nuts and counted 116 peanuts what is the Z score for this can of peanuts? (c) Carmen declares that purchase purchasing her can of nut munchies with 100 peanuts is less likely than Angelo purchasing a can of gone nuts with 116 peanuts is Carmen statement correct? Use the definition of a Z score to support or refute Carmen's claim.
A random sample of 64 shoppers showed that they spend an average of $27.31 per visit at the Sunday Mornings Bookstore. The standard deviation of the population is $2.14. Find the 90% confidence interval of the true mean. Please include all work showing how you found your answer.
A random sample of 55 airline pilots had an average yearly income of $99,000 with a standard deviation of $15,000. If we want to determine a 95% confidence interval for the average yearly income, what is the value of t? Develop a 95% confidence interval for the average yearly income of all pilots.

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