Cost of Building a Home According to the NationalAssociation of Home Builders, the average cost of build-ing a home in the Northeast is $117.91 per square foot. Arandom sample of 36 new homes indicated that the meancost was $122.57 and the standard deviation was $20.Can it be concluded that the mean cost differs from$117.91, using the 0.10 level of significance?

The hypotheses for the test are given as follows: Null hypothesis: µ=117.91. Alternative hypothesis:…

Answered: Cost of Building a Home According 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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York Manufacturing Inc. offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee per year followed the normal distribution, with a mean of 1234 dollars and a standard deviation of 321 dollars. What was the minimum cost for the 8 percent of employees that incurred the highest dental expense?
A hospital president claims that the average Salary of registered nurses at her hospital is more than $57,000. You test this claim by surveying 37 registered nurses at this hospital and find they have a mean salary of $57,425. Assume the population standard deviation is $1750 at the 0.10 level of significance is there enough evidence to support the claim of the hospital president?
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A consumer research group purchased identical items in eight drugstores. The mean cost for the purchased items was $113.49. The mode was $112. Using the empirical relationship among mean, median, and mode, estimate the median and comment on the skewness of the distribution.
The manager of the local Walmart Supercenter is studying the number of items purchased by customers in the evening hours. Listed below is the number of items for a sample of 30 customers. 9 12 5 8 4 6 6 7 11 9 8 14 9 12 5 4 10 6 18 10 6 10 11 5 What is the mean number of items? What is the median number of items? What is the range of number of items? What is the standard deviation? About 95% of the number of items are between what two values? Lower limit 10 9 13 12 13 5 Organize the number of items into a frequency distribution. What is the lower limit of the second class? What is the mean of the data organized into a frequency distribution? What is the standard deviation of the data organized into a frequency distribution? Compare these values with those computed in parts (A) and (D). Why are they different? Upper limit
A survey found that the mean commute time is 25.4 minutes for the fifteen largest U.S. cities.The Austin, TX, chamber of commerce feels that Austin's commute time is less. A survey of 25 randomly selected commuters had a mean of 22.1 minutes with a standard deviation of 5.3 minutes. At the 10% level, does the survey data suggest that Austin commute time is significantly less than the national average? Your answer should have the following: 1). Null hypothesis:2). Alternative hypothesis: 3). Test Type: P-test
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Fuel efficiency of Prius: Fueleconomy.gov, the official US government source for fuel economy information, allows users to share gas mileage information on their vehicles. The histogram below shows the distribution of gas mileage in miles per gallon (MPG) from 14 users who drive a 2012 Toyota Prius. The sample mean is 53.3 MPG and the standard deviation is 5.2 MPG. Note that these data are user estimates and since the source data cannot be verified, the accuracy of these estimates are not guaranteed. (a) The EPA claims that a 2012 Prius gets 50 MPG (city and highway mileage combined). Do these data provide strong evidence against this estimate for drivers who participate on fueleconomy.gov? The test statistic is: __________________(please round to two decimal places)The p-value:___________________________ for this hypothesis test is: (please round to four decimal places)(c) Please comment on the primary thing that is wrong about the following statement: There is sufficient evidence…
Suppose that a committee is studying whether or not there is waste of time in our judicial system. It is interested in the mean amount of time individuals waste at the courthouse waiting to be called for jury duty. The committee randomly surveyed 81 people who recently served as jurors. The sample mean wait time was 8 hours with a sample standard deviation of 4.6 hours. 1. Which distribution should you use for this problem? Explain your choice. a. The standard Normal distribution should be used because the population standard deviation is known. b. The Student's tt-distribution for 81 degrees of freedom should be used because we do not know the population standard deviation. c. The Student's tt-distribution for 80 degrees of freedom should be used because we do not know the population standard deviation. d. The standard Normal distribution should be used because the sample standard deviation is known.\ 2. Construct a 95% confidence interval for the…
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What is the equation for The standard deviation of the distribution of sample means

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