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Q1) Assume average puppy weighs 10 pounds. Sample of 10 puppies yields sample mean of 13.2 pounds and sample standard deviation of 2.78 pounds. Suppose population standard deviation is known to be 5.25. You wish to test whether sample mean varies from population mean of 10 pounds at 5 percent level of significance using two-tailed test. Compute test statistic for the sample data.
Q2) Woody is interested in determining if workers are more concerned with job security or pay. He gains cooperation of 30 individuals who work in different settings and ask each employee to rate his or her concern about salary levels and job security on scale from 1-10. (1=no concern and 10 = ultimate concern.) Woody's excel data file under contains 30 cases, one for each employee. Find out if employees are significantly more concerned about one area or other.
A confidence interval increases in width as:
Find a 90% confidence interval for the population mean weight of all such turtles.
Construct a scatter plot of P-RFM and P-HELM. If drawing the plot by hand, use graph paper to ensure accuracy.
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
What is the distinction between a one-sided and a two-sided hypothesis test in this problem?
Obtain the simple linear regression equation, then analyze the residuals by (a) constructing a histogram
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Would you expect the mean absolute percentage error to be more than or less than 0.25? Describe.
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
For each set of data, calculate mean, median, mode, range, interquartile range, standard deviation, and coefficient of variation.
If a student guesses on each question, what is the probability that the student will pass the test?
Give the expected value and standard deviation of defective shoes in the ShoeFit store order.
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