Understandable Statistics: Concepts And Methods
12th Edition
ISBN: 9781337517508
Author: Charles Henry Brase, Corrinne Pellillo Brase
Publisher: Cengage Learning
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Chapter 1.1, Problem 9P
Ecology: Wetlands Government agencies carefully monitor water quality and its effect on wetlands (Reference: Environmental Protection Agency Wetland Report EPA 832-R-93-005). Of particular concern is the concentration of nitrogen in water draining from fertilized lands. Too much nitrogen can kill fish and wildlife. Twenty-eight samples of water were taken at random from a lake. The nitrogen concentration (milligrams of nitrogen per liter of water) was determined for each sample.
- (a) Identify the variable.
- (b) Is the variable quantitative or qualitative?
- (c) What is the implied population?
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MORTALITY RATE
Table 3.5 provides the number of deaths from all causes and from accidents (unintentional
injuries) by age group in the United States in 2002. Review the following rates. Determine what
to call each one, then calculate it using the data provided in Table.
1. Unintentional-injury-specific mortality rate for the entire population. Calculate cause-specific
mortality rate.
2. All-cause mortality rate for 25-34 years old. Calculate the age-specific mortality rate.
3. All-cause mortality among males. Calculate the sex-specific mortality rate.
4. Unintentional-injury specific mortality among 25 to 34 years old males. Calculate the is a
cause-specific, age-specific, and sex-specific mortality rate
Table 3.5 All-Cause and Unintentional Injury Mortality and Estimated Population by Age Group, For
Both Sexes and For Males Alone- United States, 2002
All Races, Both Sexes
All Races, Males
Age group
(years)
All
Causes
Unintentional
Estimated
All
Unintentional
Estimated
Injuries
Pop. (x…
Background: To prevent crashes caused by running red lights, many states are installing cameras at
dangerous intersections. These cameras are used to take photographs of the license plates of vehicles that
run a red light. The Virginia Department of Transportation (VDOT) obtained data on the number of crashes
per year caused by running a red light at 13 intersections in Fairfax County, Virginia.
RED
LIGHT
PHOTO
ENFORCED
Source: Virginia Transportation Research Council, "Research Report: The Impact of Red Light Cameras
(Photo-Red Enforcement) on Crashes in Virginia", June 2007
Directions: Perform an appropriate significance test to determine whether or not the reduction in the
number of crashes was statistically significant.
1. Click on the Data button below to display the data. Copy the data into a statistical software package
and click the Data button a second time to hide it.
Data
Before
After
3.7
1.26
0.37
0.1
0.39
0
4.55
1.69
2.4
1.94
2.09
3.24
2.5
2.72
0.83
0.24
3.05
1.67
3.21…
Blood pressure: A blood pressure measurement consists of two numbers: the systolic pressure, which is the maximum pressure taken
when the heart is contracting, and the diastolic pressure, which is the minimum pressure taken at the beginning of the heartbeat. Blood
pressures were measured, in millimeters, for a sample of 7 adults. The following table presents the results. Do people with higher
diastolic pressure tend to have higher or lower systolic pressures?
Systolic Diastolic
133
91
134
87
112
75
115
83
107
71
113
77
110
74
Send data to Excel
The least-squares regression line y =b,+b,x=6.1772+0.6247x and E (x-x) = 735.4286 are known for these data. Use the
P-value method to test H:B, =0 versus H, :B, ± 0. Can you condlude that systolic blood pressure is useful in predicting diastolic
blood pressure? Use the a=0.01 level of significance.
Part: 0/4
Part i of 4
Compute the test statistic. Always roundt-score values to three decimals places.
Chapter 1 Solutions
Understandable Statistics: Concepts And Methods
Ch. 1.1 - Statistical Literacy In a statistical study what...Ch. 1.1 - Statistical Literacy Are data at the nominal level...Ch. 1.1 - Statistical Literacy What is the difference...Ch. 1.1 - Statistical Literacy For a set population, does a...Ch. 1.1 - Critical Thinking Numbers are often assigned to...Ch. 1.1 - Interpretation Lucy conducted a survey asking some...Ch. 1.1 - Marketing: Fast Food A national survey asked 1261...Ch. 1.1 - Advertising: Auto Mileage What is the average...Ch. 1.1 - Ecology: Wetlands Government agencies carefully...Ch. 1.1 - Archaeology: Ireland The archaeological site of...
Ch. 1.1 - Student Life: Levels of Measurement Categorize...Ch. 1.1 - Business: Levels of Measurement Categorize these...Ch. 1.1 - Fishing: Levels of Measurement Categorize these...Ch. 1.1 - Education: Teacher Evaluation If you were going to...Ch. 1.1 - Critical Thinking You are interested in the...Ch. 1.2 - Statistical Literacy Explain the difference...Ch. 1.2 - Statistical Literacy Explain the difference...Ch. 1.2 - Statistical Literacy Marcie conducted a study of...Ch. 1.2 - Statistical Literacy A random sample of students...Ch. 1.2 - Interpretation In a random sample of 50 students...Ch. 1.2 - Interpretation A campus performance series...Ch. 1.2 - Critical Thinking Greg took a random sample of...Ch. 1.2 - Critical Thinking Consider the students in your...Ch. 1.2 - Critical Thinking Suppose you are assigned the...Ch. 1.2 - Critical Thinking In each of the following...Ch. 1.2 - Sampling: Random Use a random-number table to...Ch. 1.2 - Prob. 12PCh. 1.2 - Sampling: Random Use a random-number table to...Ch. 1.2 - Prob. 14PCh. 1.2 - Computer Simulation: Roll of a Die A die is a cube...Ch. 1.2 - Education: Test Construction Professor Gill is...Ch. 1.2 - Education: Test Construction Professor Gill uses...Ch. 1.2 - Sampling Methods: Benefits Package An important...Ch. 1.2 - Sampling Methods: Health Care Modern Managed...Ch. 1.3 - Statistical Literacy A study of college graduates...Ch. 1.3 - Statistical Literacy Consider a completely...Ch. 1.3 - Critical Thinking A brief survey regarding...Ch. 1.3 - Critical Thinking A randomized block design was...Ch. 1.3 - Interpretation Zane is examining two studies...Ch. 1.3 - Interpretation Suppose you are looking at the 2006...Ch. 1.3 - Ecology: Gathering Data Which technique for...Ch. 1.3 - General: Gathering Data Which technique for...Ch. 1.3 - General: Completely Randomized Experiment How...Ch. 1.3 - Surveys: Manipulation The New York Times did a...Ch. 1.3 - Critical Thinking An agricultural study is...Ch. 1 - Critical Thinking Sudoku is a puzzle consisting of...Ch. 1 - Prob. 2CRPCh. 1 - Statistical Literacy You are conducting a study of...Ch. 1 - Prob. 4CRPCh. 1 - Prob. 5CRPCh. 1 - General: Type of Sampling Categorize the type of...Ch. 1 - Prob. 7CRPCh. 1 - General: Experiment How would you use a completely...Ch. 1 - Prob. 11CRPCh. 1 - Prob. 2DHCh. 1 - Prob. 1LCCh. 1 - Discuss each of the following topics in class or...Ch. 1 - Prob. 1UTCh. 1 - Prob. 2UT
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- Blood pressure: A blood pressure measurement consists of two numbers: the systolic pressure, which is the maximum pressure taken when the heart is contracting, and the diastolic pressure, which is the minimum pressure taken at the beginning of the heartbeat. Blood pressures were measured, in millimeters of mercury, for a sample of 7 adults. The following table presents the results. Systolic Diastolic 115 83 133 91 154 94 119 69 123 77 112 75 157 103 Send data to Excel Compute the least-squares regression line for predicting diastolic pressure (y) from systolic pressure (x). Round the intermediate calculations to at least six decimal places. Round the slope and y-intercept values to at least four decimal places. Regression line equation: y = Save For Later Submit Assignment Check Answer Privacy Center © 2021 McGraw Hill LLC. All Rights Reserved. Terms of Use 47°Farrow_forwardAn experiment that was carried out to study how flow rate through a solenoid valve in an automobile's pollution-control system depended on three factors: armature lengths, spring load, and bobbin depth. Four different levels (low, moderate, high, and extreme) of each factor were chosen, and a single observation on flow was made for each combination of levels. The resulting data set consisted of how many observations? Show how you derived your answer.arrow_forwardTruck Pollution: In an experiment to determine the effect of ambient temperature on the emissions of oxides of nitrogen (NOx) of diesel trucks, ten trucks were run at temperatures of 40°F and. 80°F . The emissions, in parts per billion, are presented in the following table. Truck 40°F 80°F 1 835.8 815.9 2 753.9 763.0 3 857.0 844.1 4 899.1 798.2 5 783.2 765.3 6 864.3 819.4 7 880.4 784.5 8 738.5 696.6 9 750.6 770.7 10 844.7 793.8 Send data to Excel Part: 0 / 2 0 of 2 Parts Complete Part 1 of 2 (a) Construct an 80% confidence interval for the difference in mean emissions between trucks running at 40°F and trucks running at 80°F . Let d represent the emissions at 40°F minus the emissions at 80°F . Use the TI-84 calculator and round the answers to at least two decimal places.…arrow_forward
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