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A plan for an executive travelers' club has been developed by an airline on the premise that 10% of its current customers would qualify for membership.
Assuming the validity of this premise, among 25 randomly selected current customers, what is the probability that between 2 and 6 (inclusive) qualify for membership?
Suppose it has been determined that the average number of customers waiting for service is 1.929. There are two servers. Determine:
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
The following data represent scores of 50 students in the applied business statistics test. Prepare the frequency distribution table and the frequency histogram for this data set.
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
Make a histogram showing the probabilties of r = 0, 1, 2, 3, 4, 5, 6, 7 or 8 defective syringes in a random sample of 8 syringes.
Out of the 109 males, 42% preferred Pepsi and out of the 53 females, 40% preferred Pepsi. Pepsi wanted to test to determine if the males preferred Pepsi more than females.
To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within plus-or-minus 0.04 of the population proportion, how large a sample size is required?
Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
You read a report that says, "On the basis of the simple random sample of 100 high school seniors that took the SATM test this year, a confidence interval for µ is found to be 512.00 ± 25.76." What was the confidence level used to calculate this..
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
Is it reasonable to conclude that this set of n = 16 people is not a representative sample of registered voters?
Compute the score based on their appropriate class means and standard deviations:
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