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In a study by Web Criteria, it took an average of 2.1 minutes to locate information and buy products on the Delta Airlines website, compared to an average of 2.7 minutes on the British Airways site. Assume that the data in file XR11012 contains the times (in minutes) required during visits to the two websites. In a suitable one-tail test at the 0.01 level, was the mean time for the Delta visits significantly less than that for the British Airway visits? Identify and interpret the p-value for the test.
When using dummy variables in a regression equation to model a qualitative or categorical variable, the number of dummy variables should equal to
Increasing the confidence-interval level from .95 to .99
A bacteria culture initially contains 2000 bacteria and doubles every half hour. Find the size of the baterial population after 40 minutes. Find the size of the baterial population after 7 hours.
What is the probability that this teammate has two or fewer years of experience? more than five years of experience? What is the probability that, considering both of Dave's two teammates.
Find the mean and standard deviation of X, the number of students in class, who will develop influenza.
Flaws in a certain type of drapery material appear on the average of one in 150 square feet. If we assume the Poisson distribution, give the probability of at most one flaw in 225 square feet.
Either use the p-value approach to hypothesis testing or use the significance level approach with α = .05.
What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 13 patients using the drug is selected. Find the probability that: exactly three will have this mild side effect.
What value is business research and hypothesis testing to a company? How long should it take a company to complete a scientific research study?
Do a two-sample test for equality of means assuming equal variances. Calculate the p-value. Comparison of GPA for randomly chosen college juniors and seniors: ¯ x1 = 3.05, s1 = .20, n1 = 15, ¯ x2 = 3.25, s2 = .30, n2 = 15, α = .025, left-tailed t..
Construction of histogram and pie chart for continuous data
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