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1. An opinion poll asked British Columbians: "Are you in favour of a Las-Vegas-style casino in Vancouver? Yes or No". A random sample of 500 British Columbians found that 130 were in favour of such a casino.
(a) Construct a 89% confidence interval estimate of the overall percentage of the B.C. population in favour of such a casino.
(b) The government also wants to estimate what percent of British Columbians favour allowing cigarette smoking in casinos. The government requires that the error on the estimate be no more than 3% with 89% confidence. What size of sample would be required to do this?
2. Peter, the head of a survey organization, is planning to do a survey to estimate the percentage of people who intend to vote for the federal Liberal Party in an upcoming by-election. He wants the estimate of the percentage to be correct to within 2%, 19 times out of 20. At first, Peter has absolutely no idea what fraction of the population will vote Liberal. However, Peter's assistant Janice believes that the Liberal Party will receive approximately 75% of the vote in that riding. If survey costs are $10 per person, how much money can be saved by using Janice's estimate of the percentage rather than Peter's estimate of "no idea"?
1. The counselor calculates the unbiased estimate of the population's variance to be 15. What is the variance of the distribution of means?
A standard deviation of $12. Three solar homes reported monthly utility bills of $55, $53, and $51. Which of the following statements is true?
Calculate the 95% confidence interval for the proportion of students with at least one injury for each of the two subpopulation
In patients with congestive heart failure, two or more drugs were prescribed in 257 of 437 U.S. patients. In Scotland, 39 of 179 patients had two or more drugs prescribed
Estimate the true proportion of all Americans who are in favor of gun control legislation using a 90% confidence interval.
The following sample data were obtained from three populations that did not follow a normal distribution. Compute the value of the test stastic. What is your decision on the null hypothesis?
An experiment is designed to test the potency of a drug on 20 rats. Previous animal studies have shown that 10-mg dose of the drug is lethal 5% of the time within the first 4 hours; of the animals alive at 4 hours, 10% will die in the next 4 hours..
part -1make sure you read the output carefully. this output pertains to a set of juvenile court data looking at the
Should the engineering firm be concerned? Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
Levels above 200 warrant attention. If 95 teenage boys are examined. How many would you expect to have cholesterol levels greater than 225.
A sample of farms is $1200, with a standard deviation of $350. Assume the data set has a bell-shaped distribution. Between what two values do about 95% of the data lie?
$600 (1 chance in 4800); $200 (1 chance in 2500). Find the expected value of the amount won for one entry if the cost of entering is 52 cents.
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