19. Commuting to work: The American Community Surveysampled 1923 people in Colorado and asked them how long ittook them to commute to work each day. The sample meansa11one-way commute time was 24.5 minutes with a standarddeviation of 13.0 minutes. A transportation engineer claims thatа.the mean commute time is less than 25 minutes. Do the data provide convincing evidence that the engineer's claim is true?Use the a = 0.05 level of significance.%3D

Answered: Image /qna-images/answer/7c24883b-41c8-4c19-8df1-ea2d86e8dfe3.jpg

Answered: 19. Commuting to work: The American…

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 study states that for a particular area, the average income per family is $34,569 and the standard deviation is $8256. What percentage of families in that area earn below $25,000?
The question is attached in an image.
2. The blood cholesterol levels of men age 55 to 64 are approximately Normal, with mean 222milligrams per deciliter (mg/dl) and standard deviation 37 mg/dl. A random sample of 58individuals will be collected and the sample mean cholesterol level will be computed. a. What is the mean of the sample mean? b. What is the standard deviation of the sample mean?
As reported in Runner's World magazine, the times of the finishers in the New York City 10- km run are normally distributed with mean 61 minutes and standard deviation 9 minutes. The 75th percentile for the finishing times is 67 minutes. What is the interpretation of this value?
If the mean speed for a major league fast ball is 90 miles per hour and the standard deviation is 5 miles per hour, what would the standardized score be for a pitch that is 97 miles per hour? O 0.4 4.0 1.4 O 1.0
27. The average number of cavities that 30-year-old Americans have had in their lifetimes is 7.0. The standard deviation 2.7 cavities. Is the mean different for 20-year-olds? The data show the results of a survey of 15 twenty-year-olds who were asked how many cavities they have had. Assume that that distribution of the population is normal. 6, 7, 5, 3, 7, 8, 4, 6, 5, 6, 4, 6, 7, 6, 9 What can be concluded at the 0.05 level of significance? H0: = 7 Ha: [ Select ] ["<", ">", "Not Equal To"] 7 Test statistic: [ Select ] ["Z", "T"] p-Value = [ Select ] ["0.13", "0.26", "0.03", "0.06"] [ Select ] ["Fail to Reject Ho", "Reject Ho"] Conclusion: There is [ Select ] ["statistically…
Is a measure of 29 inches "far away" from a mean of 19 inches? Suppose the data come from a sample whose standard deviation is 2 inches. A. How many standard deviation is 29 inches from 19 inches? b. Is 29 inches far away from a mean of 19 inches? c. Suppose the standard deviation of the underlying data is 7 inches. Is 29 inches far away from a mean of 19 inches?
The distribution of heights of adult American men is approximately normal with a mean of 69 inches and a standard deviation of 2.5 inches. a. What percent of these men are at least 71.5 inches tall? b. What percent of these men are between 64 and 74 inches tall?
3. The distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (I-5) in California is nearly normal with a mean of 72.6 miles/hour and a standard deviation of 4.78 miles/hour. a. What percent of passenger vehicles travel slower than 80 miles/hour? What percent of passenger vehicles travel between 60 and 80 miles/hour? B. How fast do the fastest 5% of passenger vehicles travel? C. The speed limit on this stretch of the I-5 is 70 miles/hour. Approximate what percentage of the passenger vehicles travel above the speed limit on this stretch of the I-5.
A company wants to assess the average time it takes for customers to complete a particular task on their website. They collect the following data from a sample of 10 customers: 5, 6, 7, 8, 9, 10, 10, 11, 12, 13 minutes. Calculate the sample mean and standard deviation for this data.
The carbon dioxide emissions of a group of nations had a mean of 9.2 and standard deviation of 1.8. a. One country's observation was 15.9. Find its z-score and interpret. b. Another country's observation was 2.6. Find its z-score and interpret. c. A third country's observation was 8.7. Find its z-score and interpret. a. The z-score is 3.73.7. This indicates that the observation of 15.9 is a distance of 3.73.7 standard deviation(s) above the mean. (Round to two decimal places as needed.)
The providence health maintenance organization wants to establish a criterion for recommending dietary changes if cholesterol levels are in the top 3%. What is the cutoff level for men aged 18 to 24 and the mean is 178.1 and the standard deviation is 40.7

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