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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"?
The data is based on 214 children with acute otitis media who participated in a randomized clinical trail each child had OME at the beginning of the study in either one or both ears and was randomly assigned to receive a 14 day course of one of tw..
Over the past few years, banks have strongly promoted online banking and the paying of bills online. In 2003, about 50% of internet users paid bills online.
Beta random variable with mean 1/3 and variance 1/18. What is the probability that next month, the procurement office orders at least 7/12th of its purchase from this vendor?
A decade-old study found that the proportion of high school seniors who felt that "getting rich" was an important personal goal was 67%.
When is it best to use either of them? What types of variables can you apply them to, how many variables can each encompass, and which can be employed for a prediction of a new observation?
A student must choose one of the subjects, art, geology, or psychology, as an elective. She is equally likely to choose art or psychology and twice as likely to choose geology.
In a recent year, 11th grade New York public school students taking an English test produced test scores that were normally distributed with a mean of 81 and a standard deviation of 6. Let x be a random variable that represents a test score.
A summary of material transactions for November shows the following transactions: Prepare journal entries to record these transactions.
Suppose that a study based on a sample from a targeted population shows that people at a pizza restaurant are hungrier than people at a coffee shop. make an interference based on the results of the study.
What is the p-value associated with the above sample result?
Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet.
A marketing research analyst collects data for a random sample of 100 customers out of the 400 who purchased a particular "coupon special".
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