QUESTION 14When engaging in weight-control (fitness/fat burning) types of exercise, a person is expected to attainapproximately 60% of his or her maximum heart rate. For 20-year-olds, this rate is approximately 120bpm. A simple random sample of thirty 20-year-olds was taken, and the sample mean was found to be107 bpm, with a standard deviation of 45 bpm. Researchers wonder if this is evidence to concludethat the expected level is actually lower than 120 bpm.State the null hypothesis(Ho).p = 0.6u = 107H = 120O X=120

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Answered: QUESTION 14 When engaging in…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Answer question 5
in a test of a lifelong brand of tires , a survey revealed that the mean life was 35,000 mikes and the standard deviation was 7083 mikes. if the shape of the population distribution is known to be normal, approximately what percentage of the tires lasts less than 20834 miles ?
QUESTION 1 A hardware store determined the current balances for a random sample of 100 customers with non-zero balances. The sample mean of the amount owed was $100.00 and the standard deviation was $25. Use the assumption that the sample standard deviation is equal to the population standard deviation. You are asked to find a confidence interval for the average amount owed by all customers with a non-zero balance. Which Minitab procedure would be most appropriate to use for this task? O Power and Sample Size/1-Sample Z O Power and Sample Size/Sample Size for Estimation/1-Sample Z O Basic Statistics/1-Sample Z O Basic Statistics/1-Sample t
Question 3: The waiting times (in minutes) of a random sample of 22 people at a bank have a sample standard deviation of 3.6 minutes. Assume the sample is from a normally distributed population. Use a 98% level of confidence to construct the confidence intervals for (a) the population variance and (b) the population standard deviation. Interpret the results.
Example 4: The average cholesterol level for a random sample of 25 adult women is 263 units with a standard deviation of 43 units. From previous study, it is known that the population is normally distributed with a standard deviation of 40 units. Find a 90% C.I for the mean cholesterol level for all adult women in the population.
Question 18 You want to determine the control lines for a p chart for quality control purposes. If the total number of bad products from all samples is 45, the number of samples is 50, and the sample size is 30 (which means that the value of "p"-proportion of defective products is 0.03). Which of the following would be the standard deviation used in developing the control lines for the p-control chart? 0.019 0.027 O 0.031 O None of the above
QUESTION 17 The amount of time a bank teller spends with each customer has a population mean of 3 minutes and a standard deviation of 0.40 minute. A random sample of 64 customers is selected. There is a 95% chance that the sample mean is less than how many minutes? Round your answer to three decimal places. QUESTION 18 An automotive repair shop has determined that the service time on an automobile is normally distributed with a mean of 100 minutes and a standard deviation of 15 minutes. What is the probability that a random sample of 9 automotive services will have a mean service time greater than 115 minutes? Round your answer to four decimal places. QUESTION 19 Salaries of computer engineers in UAE are strongly right skewed with mean AED 34000 and standard deviation AED 4500. A random sample of 9 computer engineers is taken. What is the probability that the average salary of the sample is more than AED 32000? 0.9088 0.0912 Not enough information 0.1545
Question 9 of 11 Stacked O Attempt 2 It appears that people who are mildly obese are less active than leaner people. One study looked at the average number of minutes per day that people spend standing or walking. Among mildly obese people, the mean number of minutes of daily activity (standing or walking) is approximately Normally distributed with 370 minutes and standard deviation 65 minutes. The mean number of minutes of daily activity for lean people is approximately Normally distributed with 523 minutes and standard deviation 106 minutes. A researcher records the minutes of activity for an SRS of 6 mildly obese people and an SRS of 6 lean people. James A. Levine et al.., "Inter-individual variation in posture allocation: Possible role in human obesity," Science, 307 (2005), pp. 584-586. What is the probability that the mean number of minutes of daily activity of the 6 mildly obese people exceeds 420 minutes? Give your answer to four decimal places. 1.8465 probability: 091 436 Ce…
Question 3 Assume the average teenager sends 250 text messages per day. You sample 28 local teenagers and find that they send 232 messages per day with a standard deviation (calculated with the correction) of 64 messages per day. What decision would you make based on these data? Fail to reject the null hypothesis; we cannot conclude that there is any difference between our sample and the nation. Fail to reject the null hypothesis; the local teenagers text more than the national average. Reject the null hypothesis; there is no evidence of a difference between our sample and the nation. Reject the null hypothesis; our sample sends significantly fewer text messages than the national average.
QUESTION 27 Glucose levels in patients free of diabetes are assumed to follow a normal distribution with a mean of 120 and a standard deviation of 16. What proportion of patients have glucose levels exceeding 115?
Question 3 A. The management of White Industries is considering a new method of assembling its golf cart. The present method requires a mean time of 42.3 minutes to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes. Using the .10 level of significance, can we conclude that the assembly time using the new method is faster? B. Do married and unmarried women spend the same amount of time per week using Facebook? A random sample of 45 married women who use Facebook spent an average of 3.0 hours per week on this social media website. A random sample of 39 unmarried women who regularly use Facebook spent an average of 3.4 hours per week. Assume that the weekly Facebook time for married women has a population standard deviation of 1.2 hours, and the population standard deviation for unmarried Facebook users is 1.1 hours per week. Using the .05…

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