Stats final Chapter 8 Multiple Choice Practice with Complete Solutions

Stats final Chapter 8 Multiple Choice Practice with Complete Solutions Gallup Poll Interviews 1600 people. Of these, 18% say that they jog regularly. A news report adds: "The poll had a margin of error of plus or minus three percentage points." You can safely conclude: 95% of all Gallup Poll samples like this one give answers within plus or minus 3% of the true population value. An agricultural researcher plants 25 plots with a new variety of corn. A 90% confidence interval for the average yield for these plots is found to be 162.72 plus or minus 4.47 bushels per acre. Which of the following is the correct interpretation of the interval? We are 90% confident the interval from 158.28 to 167.19 captures the true average yield. I collect a random sample of size n from a population and from the data collected compute a 95% confidence interval for the mean of the population. Which of the following would produce wider confidence interval, based on these same data? Use a larger confidence level A marketing company discovered the following problems with a recent poll: I.Some people refused to answer questions II. People without telephones could not be in the sample III. Some people never answered the phone in several calls Which of these sources is included in the plus or minus 2% margin of error announced for the poll? None of these sources of error You are told that the proportion of those who answered "yes" to a poll about internet use is .7, and that the standard error is .0459. The sample size: is 100 The standardized test scores of 16 students have mean x(bar)= 200 and standard deviation s= 20. What is the standard error of x(bar)? 5 A newspaper conducted a statewide survey concerning the 2008 race for state senator. The newspaper took a random sample (assume it is an SRS) of 1200 registered voters and found that 620 would vote for the Republican candidate. Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. A 90% confidence interval for p is: .517 plus or minus .024 After a college's football team once again lost a football game to the college's arch rival, the alumni association decided to conduct a survey to see if alumni were in favor of firing the coach. Let p represent the proportion of all living alumni who favor firing the coach. Which of the