6.2 The Standard Normal Distribution Table: Zc Critical Value Company XYZ know that replacement times for the DVD players it produces are normally distributed with a mean of 7.3 years and a standard deviation of 2.2 years. If the company wants to provide a warranty so that only 7% of the DVD players will be replaced before the warranty expires, what is the time length of the warranty? warranty = years Enter your answer as a number accurate to 1 decimal place.

6.2 The Standard Normal Distribution Table: Zc Critical Value Company XYZ know that replacement times for the DVD players it produces are normally distributed with a mean of 7.3 years and a standard deviation of 2.2 years. If the company wants to provide a warranty so that only 7% of the DVD players will be replaced before the warranty expires, what is the time length of the warranty? warranty = years Enter your answer as a number accurate to 1 decimal place.

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Description: 6.2 The Standard Normal Distribution Table: Zc Critical ValueCompany XYZ know that replacement times for the DVD players it produces are normally distributed with amean of 7.3 years and a standard deviation of 2.2 years.If the company wants to provi

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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High school students across the nation compete in a financial capability challenge each year by taking a National Financial Capability Challenge Exam. Students who score in the top 13 percent are recognized publicly for their achievement by the Department of the Treasury. Assuming a normal distribution, how many standard deviations above the mean does a student have to score to be publicly recognized? (Round your answer to 2 decimal places.)
esc Introduction A chain of restaurants has historically had a mean wait time of 9 minutes for its customers. Recently, the restaurant added several very popular dishes back to their menu. Due to this, the manager suspects the wait time, μ, has increased. He takes a random sample of 44 customers. The mean wait time for the sample is 9.6 minutes. Assume the population standard deviation for the wait times is known to be 3.3 minutes. Can the manager conclude that the mean wait time is now greater than 9 minutes? Perform a hypothesis test, using the 0.05 level of significance. (a) State the null hypothesis Ho and the alternative hypothesis H₁. Ho: O H₁:0 (b) Perform a Z-test and find the p-value. Here is some information to help you with your Z-test. The value of the test statistic is given by Standard Normal Distribution Step 1: Select one-tailed or two-tailed. O One-tailed O Two-tailed Explanation μ Check □<口 X X OSO 020 0=0 x-H √n • The p-value is the area under the curve to the right…
Can someone please help walk me through how I complete this graph?
The average lifetime of a certain tire is 35,000 miles, and the standard deviation is 3,500 miles. Part 1 of 3 If we assume that the mileages model is a normal distribution, what percentage of all such tires will last between 28,000 and 45,500 miles? Show your work. (Use the Empirical Rule.)
A company developing a new cellular phone plan intends to market their new phone to customers who use text and social media often. In a marketing survey, they find that customers between age 18 and 34 years send an average of 48 texts per day with a standard deviation of 12. The number of texts sent per day are normally distributed. A customer who sends 76 messages per day would correspond to what percentile? (Use a table or SALT. Round your answer to two decimal places.) A customer who sends 76 messages per day would be at the _____________ percentile.
A highschool teacher is interested in examining the math performance of one particular child, Mike, he has observed over several years. The highschool teacher has the mean and standard deviation for each year's maths test along with Mike's score on each test. Year Mean SD Mike's score 2018 90.5 5.1 96 2019 88.7 8.8 95 2020 69.5 3.4 78 Calculate the appropriate statistic to evaluate in which year Mike did his best in the math test relative to the other children tested over the years. To answer this question, we would need to compute a Q1. ABCD for each year, which would be Q2. ABCD for 2018, Q3. ABCD for 2019, and Q4. ABCD for 2020. This would mean that Mike's best math performance was in Q5. ABCD relative to the other children tested over the three years. In that year, he performed better than Q6. ABCD of the other children. Possible answers for Q4:A) -2.50B) -1.67C) 1.67D) 2.50 Possible answers for Q5:A) 2018B) 2019C) 2020D) Cannot tell…
A highschool teacher is interested in examining the math performance of one particular child, Mike, he has observed over several years. The highschool teacher has the mean and standard deviation for each year's maths test along with Mike's score on each test. Year Mean SD Mike's score 2018 90.5 5.1 96 2019 88.7 8.8 95 2020 69.5 3.4 78 Calculate the appropriate statistic to evaluate in which year Mike did his best in the math test relative to the other children tested over the years. To answer this question, we would need to compute a Q1. for each year, which would be Q2. for 2018, Q3. for 2019, and Q4. for 2020. This would mean that Mike's best math performance was in Q5. relative to the other children tested over the three years. In that year, he performed better than Q6. of the other children. Possible answers for Q1:A) performanceB) t-scoreC) raw scoreD) z-score Possible answers for Q2:A) -1.08B) 0.63C) 1.08D) -0.63 Possible answers for…
A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 36,000 miles and a standard deviation of 2100 miles. He wants to give a guarantee for free replacement of tires that don't wear well. How should he word his guarantee if he is willing to replace approximately 10% of the tires? Question content area bottom Part 1 Tires that wear out by enter your response here miles will be replaced free of charge.
mnomy use the standard deviation of the monthly percentage return for a mutual fund as a measure of the risk for the fund; in such cases, a fund that has a larger standard deviation is considered more risky than a fund with a lower standard deviation. The standard deviation for the American Century Equity Growth fund and the standard deviation for the Fidelity Growth Discovery fund were recently reported to be 15.0% and 18.9%, respectively. Assume that each of these standard deviations is based on a sample of 60 months of returns. Do the sample results support the conclusion that the Fidelity fund has a larger population variance than the American Century fund? Which fund is more risky? (17. ) Most individuals are aware of the fact that the average annual repair cost for an auto- mobile depends on the age of the automobile. A researcher is interested in finding out whether the variance of the annual repair costs also increases with the age of the auto- mobile. A sample of 26…