46. A tire manufacturer has been producing tires with an average life expectancy of 26,000 miles. Nowthe company is advertising that its new tires' life expectancy has increased. In order to test the legitimacyof the advertising campaign, an independent testing agency tested a sample of 6 of their tires and hasprovided the following data.Life Expectancy(In Thousands of Miles)282725282925Determine the mean and the standard deviation.a.At the .01 level of significance using the critical value approach, test to determine whether ornot the tire company is using legitimate advertising. Assume the population is normallyb.distributed.ANSWER: a. X- 27,s = 1.67 (rounded)Ho: 4 <26 (in thousands of miles)Ha: 4 > 26 (in thousands of miles)Since t= 1.467 <3.365, do not reject Họ and conclude that there is insufficient evidenceto support the manufacturer's claim.b.

Null Hypothesis:µ=26.Alternative Hypothesis:µ>26.The test is a right-tailed test.Since the…

Answered: 46. A tire manufacturer has been…

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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A team of ten (10) construction workers who are working on a project are classified according to the skill levels, Classes A to D. The table below shows the number of workers in each of the four (4) classes and their respective hourly pay-rate. Pay-rate (Rands/hour) Number of workers Class A 80 Class B 60 Class C 55 Class D 50 4. Calculate the mean hourly pay-rate for the 10 workers. A. R24.50/hour B. R57/hour C. R57.50/hour D. R61.75/hour
I need to understand how to calculate... Can you please be clear with the explanation ....
C.28. A car dealership records the number of cars sold each month and finds the mean =56 and the standard deviation =8.2. What does a standard deviation of 8.2 mean?
You want to buy a washing machine, and a salesperson tells you that the mean repair costs for Model A and Model B are equal. You research the repair costs. The mean repair cost of 29 Model A washing machines is $211. Assume the population standard deviation is $15. The mean repair cost of 26 Model B washing machines is $216. Assume the population standard deviation is $25. At a = 0.01, can you reject the salesperson's claim? Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) through (e). O A The mean repair cost for Model A is greater than Model B B. The mean repair costs for Model A and Model B are equal. O C. The mean repair cost for Model A is less than Model B O D. The mean repair costs for Model A and Model B are different. Let u, be the mean repair cost for Model A and let u, be the mean repair cost for Model B. What are Ho and H,? O B. Ho: H1 =H2 Hai H1 # H2 O E. Ho: H1 # H2 OC. Ho: H1 SH2 Hai H1>H2 OF. Ho: H1ZH2 Ha:…
After the pandemic hit and people were forced to spend more time indoors, there have been a suspicion among health professionals. that people are eating more and thus gaining weight. In 2018, the average weight of 192 pounds, and health experts want to know if that average weight of the American male has gone up during this pandemic. d. A sample of 50 American males yeilded a sample average weight of 195 pounds and a sample standard deviation of 14.5 pounds. What is your conclusion at the 5% level of significance? (be sure to state your conclusion in the context of this problem) e. Would your conclusion change if the level of significance were changed to 1%? Briefly explain.
i need C and D
A bottled water distributor wants to determine whether the mean amount of water contained in 1-gallon bottles purchased from a nationally known water bottling company is actually 1 gallon. You know from the water bottling company specifications that the standard deviation of the amount of water is 0.03 gallon. You select a random sample of 45 bottles, and the mean amount of water per 1-gallon bottle is 0.994 gallon. Complete parts (a) through (d) below. 1.96,-1.96 (Round to two decimal places as needed. Use a comma to separate answers as needed.) What is the final conclusion? A. Fail to reject Ho. There is not sufficient evidence that the mean amount is different from 1.0 gallon. OB. Reject Ho. There is not sufficient evidence to warrant rejection of the claim that the mean amount is different from 1.0 gallon. OC. Reject Ho. There is sufficient evidence to warrant rejection of the claim that the mean amount is different from 1.0 gallon. D. Fail to reject Ho. There is sufficient…
The following are body mass index (BMI) scores measured in 9 patients who are free of diabetes and participating in a study of risk factors for obesity. Body mass index is measured as the ratio of weight in kilograms to height in meters squared.25 27 31 33 26 28 38 41 24What is the standard deviation of BMI? You MUST show your work to receive full credit.
15
4. Lions Gate produces and distributes about 30 movies per year. On average, these movies rake in about $50.0 M domestically, with a standard deviation of $4 M. Sicario has earned $44.2 M since the start of the year. What is its z-score? 5. Approximately what percentage of Lions Gate's movies have earned less than Sicario? 6. The Last Witch Hunter has earned about $27.1 M this year. About what percentage of LG's movies earned somewhere between Sicario and the Last Witch Hunter?
42. The speeds of vehicles on a certain part of a highway are normally distributed with a mean of 60 mph and a standard deviation of 6 mph. Use the Empirical Rule to answer the following questions. a. Approximately what percentage of vehicles travel at a speed between 54 mph and 66 mph? b. Approximately what percentage of vehicles travel at a speed greater than 72 mph? c. Approximately what percentage of vehicles travel at a speed not greater than 78 mph?
You are a researcher assessing self-checkout lane violations at supermarkets in a town in the southern United States. The supermarket has five (5) self-checkout lanes. The violations by each lane are as follows: Lane A: 5 violations Lane B: 10 violations Lane C: 15 violations Lane D: 20 violations Lane E: 25 violations Please calculate the following (your standard deviation is 7.91): Mean: Standard Error of the Mean: Please interpret your Standard Error of the Mean.

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