Using & Understanding Mathematics: A Quantitative Reasoning Approach (7th Edition)
7th Edition
ISBN: 9780134705187
Author: Jeffrey O. Bennett, William L. Briggs
Publisher: PEARSON
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Chapter 6.D, Problem 52E
Statistical Significance. Find a recent news report in which the idea of statistical significance is used. Write a one-page summary of the study and the result that is considered to be statistically significant. Be sure to discuss whether you believe the result and why
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8
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8
e
ipx dx
The manager of a fleet of automobiles is testing
two brands of radial tires and assigns one tire of
each brand at random to the two rear wheels of
eight cars and runs the cars until the tires wear
out. The data (in kilometers) follow.
CAR BRAND1
BRAND2
DIFFERENCE = (BRAND1 - BF
1
36,925 33,018
3,907
2
45,300 43,280
2,020
3
36,240
35,500
740
4
32,100
31,200
900
5
37,210
37,015
195
6
48,360
46,800
1,560
7
38,200
37,810
390
8
33,500
33,215
285
Diabetes and obesity are serious health concerns in the United States and much of the
developed world. Measuring the amount of body fat a person carries is one way to monitor
weight control progress, but measuring it accurately involves either expensive X-ray
equipment or a pool in which to dunk the subject. Instead body mass index (BMI) is often
used as a proxy for body fat because it is easy to measure: BMI = mass(kg)/(height(m))² = 703
mass(lb)/(height(in))².
In a study of 15 men at TXST, both BMI and body fat were measured. Researchers imported
the data into statistical software for analysis.
A few values are missing from the output. Complete the table by filling in the missing values.
Model Summary
S
R-sq
%
(three decimal places)
(two decimal places. e.g. 12.3456%, enter 12.35)
Analysis of Variance
Source
Model
Error
Total
DF
SS
MS
F
P
17.600
0.001
DF: whole numbers
SS or MS; three decimal places
34.810
Does a simple linear regression model seem reasonable in this situation?…
Chapter 6 Solutions
Using & Understanding Mathematics: A Quantitative Reasoning Approach (7th Edition)
Ch. 6.A - Prob. 1QQCh. 6.A - On an astronomy exam, 20 students score below 79...Ch. 6.A - One hundred students take a chemistry exam. All...Ch. 6.A - Twenty students take a political science exam....Ch. 6.A - A survey asks students to state many sodas they...Ch. 6.A - Among professional actors, a small number of...Ch. 6.A - The distribution of wages at a company is...Ch. 6.A - Compared to a distribution with a broad central...Ch. 6.A - If you compared the distribution of weights of 20...Ch. 6.A - The mayor of a town is considering a run for...
Ch. 6.A - 1. Define and distinguish among mean, median, and...Ch. 6.A - Prob. 2ECh. 6.A - Briefly describe at least two possible sources of...Ch. 6.A - Prob. 4ECh. 6.A - Prob. 5ECh. 6.A - Prob. 6ECh. 6.A - In my data set of 10 exam scores, the mean turned...Ch. 6.A - In my data set of 10 exam scores, the median...Ch. 6.A - I made a distribution of 15 apartment rents in my...Ch. 6.A - Two extremely tall people skewed the distribution...Ch. 6.A - The distribution of grades was left-skewed, but...Ch. 6.A - There’s much more variation in the ages of the...Ch. 6.A - 13-18: Mean, Median, and Mode. Compute the mean,...Ch. 6.A - Mean, Median, and Mode. Compute the mean, median,...Ch. 6.A - Mean, Median, and Mode. Compute the mean, median,...Ch. 6.A - Mean, Median, and Mode. Compute the mean, median,...Ch. 6.A - 13–18: Mean, Median, and Mode. Compute the mean,...Ch. 6.A - 13-18: Mean, Median, and Mode. Compute the mean,...Ch. 6.A - Outlier Coke. Cans of Coca-Cola vary slightly in...Ch. 6.A - 20. Margin of Victory. The following data give the...Ch. 6.A - Appropriate Average. For each of the following...Ch. 6.A - 21-26: Appropriate Average. For each of the...Ch. 6.A - 21-26: Appropriate Average. For each of the...Ch. 6.A - 21-26: Appropriate Average. For each of the...Ch. 6.A - 21-26: Appropriate Average. For each of the...Ch. 6.A - 21-26: Appropriate Average. For each of the...Ch. 6.A - 27-34: Describing Distributions Consider the...Ch. 6.A - Describing Distributions. Consider the following...Ch. 6.A - 27-34: Describing Distributions Consider the...Ch. 6.A - Describing Distributions. Consider the following...Ch. 6.A - 27-34: Describing Distributions Consider the...Ch. 6.A - Describing Distributions. Consider the following...Ch. 6.A - Prob. 33ECh. 6.A - Describing Distributions. Consider the following...Ch. 6.A - Prob. 35ECh. 6.A - 35-36: Understanding Distributions. For the given...Ch. 6.A - Smooth Distributions. Through each histogram, draw...Ch. 6.A - Smooth Distributions. For each histogram, draw a...Ch. 6.A - Smooth Distributions. For each histogram, draw a...Ch. 6.A - Prob. 40ECh. 6.A - Family Income. Suppose you study family income in...Ch. 6.A - Airline Delays. Suppose you are a scheduler for a...Ch. 6.A - Weighted Means. We often deal with weighted means,...Ch. 6.A - Weighted Means. We often deal with weighted means,...Ch. 6.A - Prob. 45ECh. 6.A - Prob. 46ECh. 6.A - Prob. 47ECh. 6.A - Prob. 48ECh. 6.A - 50. Daily Averages. Cite three examples of...Ch. 6.A - 51. Distributions in the News. Find three recent...Ch. 6.A - Answer the following questions using procedures...Ch. 6.A - Prob. 52ECh. 6.A - 53. StatCrunch Project. Choose a data set...Ch. 6.B - The lowest score on an exam was 62, the median...Ch. 6.B - Which of the following is not part of a...Ch. 6.B - The lower quartile for hourly wages at a coffee...Ch. 6.B - Is it possible for a distribution to have a mean...Ch. 6.B - Suppose you are given the mean and just one data...Ch. 6.B - The standard deviation is best described as a...Ch. 6.B - What type of data distribution has a negative...Ch. 6.B - In any distribution, it is always true that a. the...Ch. 6.B - Which data set would you expect to have the...Ch. 6.B - Professors Smith, Jones, and Garcia all got the...Ch. 6.B - Consider two grocery stores at which the mean time...Ch. 6.B - Describe how we define and calculate the range of...Ch. 6.B - Prob. 3ECh. 6.B - Prob. 4ECh. 6.B - Prob. 5ECh. 6.B - Prob. 6ECh. 6.B - The distributions of scores on two exams had the...Ch. 6.B - The highest exam score was in the upper quartile...Ch. 6.B - For the 30 students who took the test, the high...Ch. 6.B - I examined the data carefully, and the range was...Ch. 6.B - The standard deviation for the heights of a group...Ch. 6.B - The mean gas mileage of the compact cars we tested...Ch. 6.B - 13. Big Bank Verification. Find the mean and...Ch. 6.B - Prob. 14ECh. 6.B - Comparing Variations. Consider the following data...Ch. 6.B - Prob. 16ECh. 6.B - Prob. 17ECh. 6.B - Comparing Variations. Consider the following data...Ch. 6.B - Understanding Variation. The following exercises...Ch. 6.B - Understanding Variation. The following exercises...Ch. 6.B - Pizza Deliveries. After recording the pizza...Ch. 6.B - Airline Arrival Times. Two airlines have data on...Ch. 6.B - 23. Portfolio Standard Deviation. The book...Ch. 6.B - Defect Rates. Two factories each produce 1000...Ch. 6.B - 25. Ice Cream Deviations. Each night you total the...Ch. 6.B - Vet Data. A small animal veterinarian reviews her...Ch. 6.B - Prob. 27ECh. 6.B - Prob. 28ECh. 6.B - 29. Quality Control. An auto transmission...Ch. 6.B - Web Data Sets. Go to any website that gives data...Ch. 6.B - Prob. 31ECh. 6.B - Prob. 32ECh. 6.B - Prob. 33ECh. 6.B - Prob. 34ECh. 6.B - 35. Variation in StatCrunch. Load the data set...Ch. 6.B - 36. StatCrunch Project. Choose a data set...Ch. 6.C - Graphs of normal distributions a. always look...Ch. 6.C - In a normal distribution, the mean a. is equal to...Ch. 6.C - In a normal distribution, data values farther from...Ch. 6.C - Consider wages at a fast food restaurant where...Ch. 6.C - In a normal distribution, about 2/3 Of the data...Ch. 6.C - Suppose a car driven under different conditions...Ch. 6.C - Consider again the car described in Question 6. On...Ch. 6.C - Consider an exam with a normal distribution of...Ch. 6.C - An acquaintance tells you that his IQ is in the...Ch. 6.C - The height of a particular 7-year-old girl has a...Ch. 6.C - 1. What is a normal distribution? Briefly describe...Ch. 6.C - 2. What is the 68-95-99.7 rule for normal...Ch. 6.C - 3. What is a standard score? How do you find the...Ch. 6.C - Prob. 4ECh. 6.C - The heights of male basketball players at Kentucky...Ch. 6.C - The weights of babies born at Belmont Hospital are...Ch. 6.C - The weights of babies born at Belmont Hospital are...Ch. 6.C - On yesterday's mathematics exam, the standard...Ch. 6.C - My professor graded the final on a curve, and she...Ch. 6.C - Jack is the 50th percentile for height, so he is...Ch. 6.C - Prob. 11ECh. 6.C - Prob. 12ECh. 6.C - Prob. 13ECh. 6.C - 13-18: Normal Distributions. State, with an...Ch. 6.C - 13-18: Normal Distributions. State, with an...Ch. 6.C - Normal Distributions. State, with an explanation,...Ch. 6.C - Prob. 17ECh. 6.C - 13-18: Normal Distributions. State, with an...Ch. 6.C - The 68-95-99.7 Rule. A set of test scores is...Ch. 6.C - The 68-95-99.7 Rule. The resting heart rates for a...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - 21-28: Psychology Exam. The scores on a psychology...Ch. 6.C - 21-28: Psychology Exam. The scores on a psychology...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Standard Scores and Percentiles. Use Table 6.3 to...Ch. 6.C - Standard Scores and Percentiles. Use Table 6.3 to...Ch. 6.C - Percentiles. Use Table 6.4 to find the approximate...Ch. 6.C - Percentiles. Use Table 6.4 to find the approximate...Ch. 6.C - Pregnancy Length. Actual lengths of terms are...Ch. 6.C - Pregnancy Length. Actual lengths of terms are...Ch. 6.C - Prob. 35ECh. 6.C - Prob. 36ECh. 6.C - Heights. According to data from the National...Ch. 6.C - Body Mass Index (BMI). The body mass indexes of...Ch. 6.C - 39. Is It Likely? Suppose you read that the...Ch. 6.C - Prob. 40ECh. 6.C - GRE Scores. Scores on the verbal Graduate Record...Ch. 6.C - 41-47: GRE Scores. Scores on the verbal section of...Ch. 6.C - 41-47: GRE Scores. Scores on the verbal section of...Ch. 6.C - Prob. 44ECh. 6.C - 41-47: GRE Scores. Scores on the verbal section of...Ch. 6.C - Prob. 46ECh. 6.C - Prob. 47ECh. 6.C - Normal Distributions. Many data sets described in...Ch. 6.C - Normal Demonstration. Do a Web search on the...Ch. 6.C - Heights of American Men. The heights of American...Ch. 6.C - Normal Distributions in StatCrunch. Go to the work...Ch. 6.C - Prob. 52ECh. 6.D - Prob. 1QQCh. 6.D - Prob. 2QQCh. 6.D - Prob. 3QQCh. 6.D - Prob. 4QQCh. 6.D - A poll finds that 35% of the people surveyed...Ch. 6.D - Prob. 6QQCh. 6.D - Consider a survey with a margin of error of 4%. If...Ch. 6.D - Prob. 8QQCh. 6.D - Prob. 9QQCh. 6.D - Prob. 10QQCh. 6.D - Prob. 1ECh. 6.D - Prob. 2ECh. 6.D - Prob. 3ECh. 6.D - Prob. 4ECh. 6.D - Prob. 5ECh. 6.D - Prob. 6ECh. 6.D - Prob. 7ECh. 6.D - Prob. 8ECh. 6.D - Prob. 9ECh. 6.D - Prob. 10ECh. 6.D - Both agencies conducted their surveys carefully,...Ch. 6.D - If you want to reduce the margin of error in your...Ch. 6.D - Prob. 13ECh. 6.D - Prob. 14ECh. 6.D - Prob. 15ECh. 6.D - Subjective Significance. For each of the following...Ch. 6.D - 15-20: Subjective Significance. For each of the...Ch. 6.D - Prob. 18ECh. 6.D - Prob. 19ECh. 6.D - 15-20: Subjective Significance. For each of the...Ch. 6.D - Human Body Temperature. A study by University of...Ch. 6.D - Seat Belts and Children. In a study of children...Ch. 6.D - SAT Preparation. A study of 75 students who took...Ch. 6.D - Weight by Age. A National Health Survey determined...Ch. 6.D - Margin of Error. Find the margin of error and the...Ch. 6.D - Prob. 26ECh. 6.D - 25-32: Margin of Error. Find the margin of error...Ch. 6.D - Prob. 28ECh. 6.D - Prob. 29ECh. 6.D - 25-32: Margin of Error. Find the margin of error...Ch. 6.D - 25-32: Margin of Error. Find the margin of error...Ch. 6.D - Margin of Error. Find the margin of error and the...Ch. 6.D - 33-38: Formulating Hypotheses. Consider the...Ch. 6.D - Prob. 34ECh. 6.D - Prob. 35ECh. 6.D - Prob. 36ECh. 6.D - Prob. 37ECh. 6.D - Prob. 38ECh. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D - Prob. 44ECh. 6.D - Prob. 45ECh. 6.D - Prob. 46ECh. 6.D - Prob. 47ECh. 6.D - Better Margin of Error. Suppose you want to...Ch. 6.D - Prob. 49ECh. 6.D - Recent Polls. Visit the websites of polling...Ch. 6.D - Prob. 51ECh. 6.D - Statistical Significance. Find a recent news...Ch. 6.D - Prob. 53ECh. 6.D - Hypothesis Testing. Find a news report describing...Ch. 6.D - 55. Confidence Interval. Go to and choose...
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