Elementary Statistics 10th Edition Mario F. Triola - Solutions

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Is the population standard deviation known?
Gender differences in preferences of activities among the options of dinner, movie, watching television, reading a book, golf, tennis, swimming, attending a baseball game, attending a football
Make Comparison of casino games: craps versus roulette
Do statistics students tend to have pulse rates that are different from those of people not studying statistics?40. A comparison of GPAs of statistics students with those of students not taking
Do people who exercise vigorously tend to have reaction times that are different from those of people who do not?>762 Chapter 15 Projects, Procedures, Perspectives
Is there support for the theory that the ratio of a person’s height to his or her navel height is the Golden Ratio of about 1.6:1?32. A comparison of the numbers of keys carried by males and
Is there a relationship between the selling price of a home and its living area(in square feet), lot size (in acres), number of rooms, number of baths, and the annual tax bill?
Comparison of the ages of science books and English books in the college library 12. Estimate the hours that students study each week
Graph from a newspaper or magazine redrawn to better describe the data 2. Newspaper article about a survey rewritten to better inform the reader 3. Using coin toss to get better survey results from
Is there a correlation between height and pulse rate?
Is there a relationship between exercise and the number of hours worked each week?
Is there a relationship between eye color and exercise?
Is there a relationship between exercise and smoking?
Is there a difference in pulse rates between those who smoke and those who do not?
Is there a difference in pulse rates between those who exercise and those who do not?
Do males and females have different numbers of credit cards?
Do males and females carry different amounts of change?
A survey can be an excellent source of data. See the accompanying sample survey that provides opportunities for many interesting projects that address questions such as these:1. When people
Construct a p chart for the proportion of defective calculators, and determine whether the process is within statistical control. Since we know the process is actually stable with p 5 0.05, the
Simulate the following process for 20 days: Each day, 200 calculators are manufactured with a 5%rate of defects, and the proportion of defects is recorded for each of the 20 days. The calculators for
4. Using Probability in Control Charts When interpreting control charts, one of the three out-of-control criteria is that there are eight consecutive points all above or all below the centerline. For
3. Hypothesis Test for Defective Seat Belts Refer to the data in Exercise 1 and, using all of the data from the 2000 seat belts that were tested, use a 0.05 significance level to test the claim that
2. Confidence Interval for Defective Seat Belts Refer to the data in Exercise 1 and, using all of the data from the 2000 seat belts that were tested, construct a 95% confidence interval for the
1. Control Chart for Defective Seat Belts The Flint Accessory Corporation manufactures seat belts for cars. Federal specifications require that the webbing must have a breaking strength of at least
. Control Chart for Defects The Medassist Pharmaceutical Company manufactures aspirin tablets. Each day, 100 tablets are randomly selected and tested. A tablet is considered defective if it has
4. Constructing a Control Chart for Infectious Diseases In each of 13 consecutive and recent years, 100,000 adults 65 years of age or older were randomly selected and the number who died from
3. Chart Using subgroups of size n 5 3 corresponding to the rows of the table, construct an chart and determine whether the process mean is within statistical control.Does the process appear to be
2. R Chart Using subgroups of size n 5 3 corresponding to the rows of the table, construct an R chart and determine whether the process variation is within statistical control.If it is not, identify
1. Run Chart Construct a run chart for the 15 values. Does there appear to be a pattern suggesting that the process is not within statistical control?
Control Charts When monitoring the times it takes technicians to repair computers, why is it important to use an chart and an R chart together?
Manufacturing Run Amok What would be a possible adverse consequence of a Pepsi bottling plant running a process that is not monitored?
Statistical Process Control The title of this chapter is “Statistical Process Control.”What does that mean?
Pattern over Time Why is it important to monitor a changing pattern of data over time?
Constructing an np Chart A variation of the control chart for p is the np chart in which the actual numbers of defects are plotted instead of the proportions of defects.The np chart will have a
p Chart for Boston Rainfall Refer to the Boston rainfall amounts in Data Set 10 in Appendix B. For each of the 52 weeks, let the sample proportion be the proportion of days that it rained. (Delete
Polling When the Infopop polling organization conducts a telephone survey, a call is considered to be a defect if the respondent is unavailable or refuses to answer questions.For one particular poll
p Chart for Defective Car Batteries Defective car batteries are a nuisance because they can strand and inconvenience drivers. A car battery is considered to be defective if it fails before its
p Chart for Divorce Rate In each of 10 consecutive and recent years, 10,000 people were randomly selected and the numbers of divorces were found, with the results given below (based on data from the
p Chart for Birth Rate In each of 10 consecutive and recent years, 10,000 people were randomly selected and the numbers of births they generated were found, with the results given below (based on
Interpreting a Control Chart When monitoring the process of producing altimeters, a company finds that the process is out of statistical control because there is a downward pattern of defects that is
Control Limits Using the methods of this section, a process is analyzed and the upper and lower control limits are found to be 0.250 and 20.050 respectively. What upper and lower control limits are
Contract Specification The Paper Chase office supply company requires a supplier of pens to maintain a production process with a defect rate less than 2%. If the supplier uses a p chart to determine
p Chart What is a p chart, and what is its purpose?
Boston Rainfall: Constructing an Chart Using the 52 samples of seven values each, construct an chart and determine whether the process mean is within statistical control.If it is not, identify which
Boston Rainfall: Constructing an R Chart Using the 52 samples of seven values each, construct an R chart and determine whether the process variation is within statistical control. If it is not,
Minting Quarters: Chart Construct an chart and determine whether the process mean is within statistical control. If it is not, identify which of the three out-of-control criteria lead to rejection of
Minting Quarters: R Chart Construct an R chart and determine whether the process variation is within statistical control. If it is not, identify which of the three out-ofcontrol criteria lead to
Minting Quarters: Run Chart Construct a run chart for the 100 values. Does there appear to be a pattern suggesting that the process is not within statistical control? What are the practical
R Chart In each day of production, seven aluminum cans with thickness 0.0109 in.were randomly selected and the axial loads were measured. The ranges for the different days are listed below, but they
Variation What is the difference between random variation and assignable variation?
Control Charts What is a control chart? What is an R chart? What is an chart? What is the difference between an R chart and an chart?
Statistical Control What does it mean for a process to be out of statistical control?
Process Data What are process data?
In 1970, a lottery was used to determine who would be drafted into the U.S. Army.The 366 dates in the year were placed in individual capsules. First, the 31 January capsules were placed in a box;
In-class activity Divide into groups of three or four people. Appendix B includes many data sets not yet addressed by the methods of this chapter. Search Appendix B for variables of interest, then
In-class activity Divide into groups of 8 to 12 people.For each group member, measure the person’s height and also measure his or her navel height, which is the height from the floor to the navel.
Out-of-class activity Divide into groups of three or four. Survey students by asking them to identify their major and gender. For each surveyed subject, determine the accuracy of the time on his or
Out-of-class activity See this chapter’s “From Data to Decision” project, which involves analysis of the 1970 lottery used for drafting men into the U.S. Army. Because the 1970 results raised
Out-of-class activity Divide into groups of three or four students. Investigate the relationship between two variables by collecting your own paired sample data and using the methods of Section 13-6
In-class activity Do Activity 2 using pulse rate instead of arm span. Measure pulse rates by counting the number of heartbeats in 1 min.
In-class activity Divide into groups of 8 to 12 people.For each group member, measure his or her height and measure his or her arm span. For the arm span, the subject should stand with arms extended,
In-class activity Use the existing seating arrangement in your class and apply the runs test to determine whether the students are arranged randomly according to gender. After recording the seating
Test Effectiveness Which of the preceding exercises leads to the results that are most helpful in determining whether the preparation course appears to be effective? Does the preparation course
Wilcoxon Signed-Ranks Test Use the Wilcoxon signed-ranks test to test the claim that there is no difference between the before and after scores.
Sign Test Use the sign test to test the claim that there is no difference between the before and after scores.
Matched Data Use a t test to test the claim that the mean difference between the before and after scores is equal to zero.
Rank Correlation Use rank correlation to test for a correlation between the before scores and the after scores.
Linear Correlation Test for a linear correlation between the before scores and the after scores. If there is a linear correlation, does that mean that the preparation course is effective? Why or why
Graph Construct a scatterplot. Does there appear to be a correlation between the before scores and the after scores?
In Exercises 1–8, use the data in the table below. The values are based on a scatterplot in“An SAT Coaching Program That Works,” by Jack Kaplan, Chance, Vol. 15, No. 1. The values are math SAT
Does the Weight of a Car Affect Leg Injuries in a Crash? Data were obtained from car crash experiments conducted by the National Transportation Safety Administration.New cars were purchased and
Is the Lottery Random? Listed below are the first digits selected in 40 consecutive drawings of the New York State Win 4 lottery game. Do odd and even digits appear to be drawn in a sequence that is
Do Beer Drinkers and Liquor Drinkers Have Different BAC Levels? The sample data in the following list show BAC (blood alcohol concentration) levels at arrest of randomly selected jail inmates who
Testing for Gender Discrimination The Axipon accounting firm claims that hiring is done without any gender bias. Among the last 40 new employees hired, 15 are women. Job applicants are about half men
Medical School Rankings U.S. News and World Report magazine ranked research medical schools and listed the corresponding “average” MCAT scores. The table below is based on those results. Is there
Efficiency Nonparametric tests are typically not as efficient as a corresponding parametric test, assuming that the necessary requirements are satisfied. What does the efficiency measure?
Rank Many nonparametric tests are based on ranks. What is a rank?
Distribution-Free Test What is the difference between a nonparametric test and a distribution-free test?
Nonparametric Test What is a nonparametric test?
Finding Critical Valuesa. Using all of the elements A, A, A, B, B, B, B, B, B, list the 84 different possible sequences.b. Find the number of runs for each of the 84 sequences.c. Use the results from
Finding Critical Numbers of Runs Using the elements A, A, B, B, what is the minimum number of possible runs that can be arranged? What is the maximum number of runs? Now refer to Table A-10 to find
Large Sample: Testing for Randomness of Baseball World Series Victories Test the claim that the sequence of World Series wins by American League and National League teams is random. Given below are
Large Sample: Testing for Randomness of Odd and Even Digits in Pi A New York Times article about the calculation of decimal places of p noted that “mathematicians are pretty sure that the digits of
Large Sample: Saturday Rainfall The second example of this section used the Monday rainfall amounts from Data Set 10 in Appendix B. Use the Saturday rainfall amounts to test for randomness of days
Large Sample: Genders of Bears The first example of this section used the genders of the first 10 bears listed in Data Set 6 in Appendix B. Conduct a runs test for randomness using the genders of all
Stock Market: Testing for Randomness Above and Below the Median Listed below are the annual high points of the Dow Jones Industrial Average for a recent sequence of years. First find the median of
Indoor Movie Theaters: Testing for Randomness Above and Below Median Trends in business and economics applications are often analyzed with the runs test. Given below are the numbers of indoor movie
Testing for Randomness of Presidential Election Winners For a recent sequence of presidential elections, the political party of the winner is indicated by D for Democrat and R for Republican. Does it
Testing for Randomness of Baseball World Series Victories Test the claim that the sequence of World Series wins by American League and National League teams is random.Given below are recent results,
Olympic Gold Medal Winners Listed below are gold medal winners in the men’s 400-meter dash, where U represents the United States and O represents any other country. Does it appear that the
Genders of Bears The first example of this section used the genders of the first 10 bears listed in Data Set 6 in Appendix B. Conduct a runs test for randomness using the genders of the first 20
4. Biased Sample After using the runs test for randomness, it is found that a sequence of 20 males and 80 females appears to be random. Does this imply that the sample is representative of the
3. Runs Test If the runs test leads to the conclusion that a particular sample is random, can we conclude that the data have been selected in a way that is appropriate for statistical purposes?
1. Runs Test A pollster conducts a survey by filling out a page of responses from each subject he interviews. He then shuffles the pages before submitting them for analysis.Can the runs test for
Effect of Ties on rs Refer to Data Set 5 in Appendix B for the times (in seconds) of tobacco use and alcohol use depicted in animated children’s movies. Calculate the value of the test statistic rs
Appendix B Data Set: Forecasting Weather Refer to Data Set 8 in Appendix B.a. Use the five-day forecast high temperatures and the actual high temperatures. Is there a correlation? Does a significant
Assume that researchers want to develop a method for predicting the amount of nicotine, and they want to measure only one other item. In choosing between tar and carbon monoxide, which is the better
Appendix B Data Set: Bad Stuff in Cigarettes Refer to Data Set 3 in Appendix B.a. Use the paired data consisting of tar and nicotine. Based on the result, does there appear to be a significant
Movie Budgets and Gross Listed below are the budgets (in millions of dollars) and the gross receipts (in millions of dollars) for randomly selected movies (based on data from the Motion Picture
Song Audiences and Sales The table below lists the numbers of audience impressions(in hundreds of millions) listening to songs and the corresponding numbers of albums sold (in hundreds of thousands).

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Elementary Statistics 10th Edition Mario F. Triola - Solutions

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