Chapter 1: Q10 (page 10)
Determine whether the sampling method appears to be sound or is flawed.
Clinical Trials. Researchers at Yale University conduct a wide variety of clinical trials by using subjects who volunteer after reading advertisements soliciting paid volunteers.
The sampling method is flawed.
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Determine whether the data are from discrete data or continuous data set.
McDonald’s In a study of service times at a McDonald’s drive-up window, the numbers of cars serviced each hour of several days are recorded.
In Exercises 29–36, answer the given questions, which are related to percentages.
Percentages in Negotiations When the author was negotiating a contract for the faculty and administration at a college, a dean presented the argument that if faculty receive a 4% raise and administrators receive a 4% raise, that’s an 8% raise and it would never be approved. What’s wrong with that argument?
In Exercises 9–12, determine whether the sampling method appears to be sound or is flawed.
Credit Card Payments In an AARP, Inc. survey of 1019 randomly selected adults, each was asked how much credit card debt he or she pays off each month.
Statistical Significance and Practical Significance. In Exercises 13–16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.
MCAT The Medical College Admissions Test (MCAT) is commonly used as part of the decision-making process for determining which students to accept into medical schools. To test the effectiveness of the Siena MCAT preparation course, 16 students take the MCAT test, then they complete the preparatory course, and then they retake the MCAT test, with the result that the average (mean) score for this group rises from 25 to 30. There is a 0.3% chance of getting those results by chance. Does the course appear to be effective?
In Exercises 29–36, answer the given questions, which are related to percentages.
Checking Job Applicants In a study conducted by the Society for Human Resource Management, 347 human resource professionals were surveyed. Of those surveyed, 73% said that their companies conduct criminal background checks on all job applicants.
a.What is the exact value that is 73% of the 347 survey subjects?
b. Could the result from part (a) be the actual number of survey subjects who said that their companies conduct criminal background checks on all job applicants? Why or why not?
c. What is the actual number of survey subjects who said that their company conducts criminal background checks on all job applicants?
d. Assume that 112 of the survey subjects are females. What percentage of those surveyed are females?
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