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College students are a major target for advertisements for credit cards. At a university, 65% of students surveyed said they had opened a new credit card account within the past year. If that percentage is accurate, how many students would you expect to survey before finding one who had not opened a new account in the past year?
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 81.
What percent of trucks logged more than 57,060 but less than 58,280 miles? What percent of Fords travelled 62,000 miles or less in the year?
If someone had x=2 job changes, what does the least squares line predict for y, the annual salary?
The variance of the return per share is 4 for stock 1 and 100 for stock 2. The covariance of the return between the two stocks is 5 per share. Use the total variance of the investment as investment risk.
(a) Use the steps of hypothesis testing, (b) figure the effect size for the study; and (c) explain your answers to (a) and (b) to someone who has never had a course in statistics.
The standard deviation is estimated to be 0.279. Use the 99% level of confidence.
The level of satisfaction in a consumer survey would represent what level of measurement?
Determine the mean and standard deviation of this distribution?
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group Perform the chi-square test for a uniform distribution at α = .01
What is the likelihood all four of the selected flights arrived within 15 minutes of the scheduled time?
Determine the variance of firm's profit for the month.
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