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Question: A regional retailer would like to determine if the variation in average monthly store sales can, in part, be explained by the size of the store measured in square feet. A random sample of 21 stores was selected and the store size and average monthly sales were computed. The following results are shown
a. Construct a scatter plot using this data. What, if any relationship, appears to exist between the two variables?
b. Calculate the sample correlation coefficient between store size and average monthly sales.
c. Conduct a hypothesis test to determine if a positive correlation exists between store size and average monthly sales. Use a level of significance of 0.025.
Under what conditions can we not use the normal distribution but can use the t distribution to ?nd con?dence intervals for the unknown population mean?
Heights of ten year old boys (5th graders) follow an approximate normal distribution with mean u=55.5 inches and standard deviation σ=2.7 inches:
Also give a credible set of highest posterior probability close to 95% for the parameter in question. Plot both the prior and the posterior distributions of the parameter.
Electrohydraulic servoniechanisms are used in control systems requiring a rapid response for a large mass. An electrohydraulic servomechanism can provide an output of 100 kW or greater [17].
Show the sampling distribution of the mean amount of Medicare spending for a sample of fifty 2003 enrollees.
The times to failure of certain electronic components in accelerate environment tests are 15, 28, 3, 12, 42, 19, 20, 2, 25, 30, 62, 12, 18, 16, 44, 65, 33, 51, 4, and 28 minutes. Looking upon these data as a random sample from an exponential popu..
in a small town the relationship between robberies and police officers on aduty has been collected. x represents the
The following table gives the number of U.S. families, in thousands, with pet dogs, pet cats, and pet birds, by size of family.
For the system described in Problem P10.13, the goal is to achieve a phase margin of 50° with the additional requirement that the time to settle (to within 2% of the final value) be less than 4 seconds. Design a lead network to meet the specifica..
What features of the distribution can you see in both the histogram and the boxplot?- What features of the distribution can you see in the histogram that you could not see in the boxplot?
marketing estimates that a new instrument for the analysis fo soil samples will be very successful moderate successful
Design an experiment that will require a matchedpairs't procedure to analyze the results.- Which experiment would you consider the stronger design? Why?
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