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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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In Exercises 29鈥�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?
Poisson Probability Distribution The random variable x represents the number of phone calls the author receives in a day, and it has a Poisson distribution with a mean of 7.2 calls. What are the possible values of x? Is a value of x = 2.3 possible? Is x a discrete random variable or a continuous random variable?
In Exercises 9鈥�12, determine whether the sampling method appears to be sound or is flawed.
Smartphone Usage In a survey of smartphone ownership, the Pew Research Center randomly selected 1006 adults in the United States.
Statistical Significance and Practical Significance. In Exercises 13鈥�16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.
IQ Scores Most people have IQ scores between 70 and 130. For $39.99, you can purchase a PC or Mac program from HighIQPro that is claimed to increase your IQ score by 10 to 20 points. The program claims to be 鈥渢he only proven IQ increasing software in the brain training market,鈥� but the author of your text could find no data supporting that claim, so let鈥檚 suppose that these results were obtained: In a study of 12 subjects using the program, the average increase in IQ score is 3 IQ points. There is a 25% chance of getting such results if the program has no effect.
Determine whether the data are from discrete data or continuous data set.
The Insurance Institute for Highway Safety collects data consisting of the numbers of motor vehicle fatalities caused by driving while texting.
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