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For each of the following, indicate whether or not you would expect it to have a strong seasonal component and why.
a. Sales of colorful wrapping paper, recorded monthly
b. The number of air travelers to Hawaii from Chicago, recorded monthly
c. The S&P 500 stock market index, recorded daily. Assume that the stock market is efficient, so that any foreseeable trends have already been eliminated through the action of large investors attempting to profit from them.
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Create a stem-and -leaf diagram for the data.
Explain these results to a person who understands the t test for a single sample but knows nothing about the t test for independent means.
Calculate a 90% confidence interval for the percentage of homes in the US that had guns at the time of survey.
She then selects a sample of 102 football players and finds that their average math SAT is 460. Use alpha =.01 to perform the appropriate hypothesis test.
Does the overall data support the mayor's claim?
A sample of ten ER patients was conducted to determine their average wait time and to compare this to the target wait time. The hospital wants to make sure that patients do not wait more than 35 minutes. Test following hypotheses using a 95% con..
Note that under the exponential assumption, P(X>t) = exp(-t/theta). If t=5, use the result from (a) to find an approximate one-sided lower 95% confidence limit for theta.
To test whether the significant difference between two sample variance using F-tests.
MATH1550H: Assignment: Questions: Let’s assume the department of Mathematics of Trent University has 11 faculty members. For i = 0; 1; 2; 3; find pi, the probability that i of them were born on Canada Day using the binomial distributions.
14 machines are planned to be used for a 60-day production run for a customer. The operating time is 1660 hours. Upon failure, a machine must be returned to the manufacturer for repair.
An independent researcher has decided to study variations in TV viewing habits among three American cities. She has managed to randomly sample households in Chicago, Atlanta, and Minneapolis and gather data on the daily "on" times for households o..
As long as there is either an upward or downward trend in the data, will a k-period moving average have a smaller mean square error than a moving average obtained with k+1 periods? Why or why not?
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