A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the Florida coastline from environmental disasters. Thirty-nine hundred Florida residents were surveyed.
Which of the following is the population used in the study?
A) Florida residents willing to spend more tax dollars protecting the coastline from environmental disasters
B) all Florida residents who lived along the coastline
C) the 3900 Florida residents who were surveyed
D) all Florida residents
Q. 2An insurance company conducted a study to determine the percentage of cardiologists who had been sued for malpractice in the previous two years. The sample was randomly chosen from a national directory of doctors.
What is the variable of interest in this study?
A) the doctor's area of expertise (i.e., cardiology, pediatrics, etc.)
B) all cardiologists in the directory
C) the number of doctors who are cardiologists
D) the responses: have been sued/have not been sued for malpractice in the last two years
Q. 3An assembly line is operating satisfactorily if fewer than 3 of the phones produced per day are defective. To check the quality of a day's production, the company randomly samples 10 phones from a day's production to test for defects.
Define the population of interest to the manufacturer.
A) the 10 responses: defective or not defective
B) the 3 of the phones that are defective
C) the 10 phones sampled and tested
D) all the phones produced during the day in question
Q. 4A sample of 100 e-mail users were asked whether their primary e-mail account was a free account, an institutional (school or work) account, or an account that they pay for personally. Identify the classes for the resulting data.
What will be an ideal response?
Q. 5In an eye color study, 25 out of 50 people in the sample had brown eyes. In this situation, what does the number .50 represent?
A) a class frequency B) a class percentage
C) a class relative frequency D) a class
Q. 6In a survey of 2000 high school students, 14 of those surveyed read at least one best-seller each month. Give an example of a descriptive statement and an inferential statement that could be made based on this information.
What will be an ideal response?
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