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A survey of young people's shopping habits in a small city during the summer months of 2009 showed the following: Shoppers aged 12 to 14 years took an average of 10 shopping trips per month and spent an average of $15 per trip. Shoppers aged 15 to 17 years took an average of 11 trips per month and spent an average of $17 per trip. Assume that this city has 1100 shoppers aged 12 to 14 years and 900 shoppers aged 15 to 17 years.
Find the mean amount spent per person per month by shoppers aged 12 to 17 years in this city.
If the probability distribution of X is: Determine the expected value of X? Find out the variance of X?
The average weight of adult men is 172 pounds with a standard deviation of 29 pounds. 30 men were asked their weight and the mean was calculated to be 181, test the hypothesis that the mean is not 172 pounds using alpha = .05.
With a standard deviation of 9.87 minutes. At the 0.05 level of significance, test the claim that at this airport the mean wait for takeoff is less than the mean wait for baggage.
How do you find the z-score corresponding to a score of X = 100 for the distributions given below? How do you know what direction they are going?
But each such incident costs $50. What is the probability that maintenance expenses for the press will be no more than $100 on a typical 8 hour workday?
Using a test, 80% of Down's Sydrome cases can be identified, while 5% of normals are detected as positive. What is the sensitivity and specificity of the test?
What is the difference between a one-tail and a two-tail test? How do we identify each? What is meant by a p-value?
Use Hypothesis testing to determine if the data indicate that there are significant differences among the three therapies? Test at the .05 level of significance.
Patient's heart attack as mild, moderate or severe. The nurse's classification of the severity of the patient's heart attack is an example of what type of variable?
A method of determining if relationships exist between two variables is:
Determine the frequency of wrong numbers given to callers. Each sample consisted of 100 calls. Determine 95 pct limits. Is the process stable(i.e., in control)? explain.
where phi = golden ratio. What is the long-term fraction of time the chain spends in each of the states? Answer must be gotten without a calculator.
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