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A supervisor has noticed that sales for all departments world wide has been averaging $12,000 a month for a number of years. For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Management is concerned. Perform a hypothesis test to determine if this change in sales is a potential problem.
a) Use a 1 % alpha for this analysis.
b) Make a recommendation to management based on your result.
At the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate conclusion would be:
The following study was developed by Economist Simon Fass. Fass surveyed a sample population of low-income households in St. Martin. The variables analyzed were monthly income per adult and choice of rental contract for housing.
Construct a 95% confidence interval on the population mean for the following sample data set:
To find out whether the course is effective in increasing sales, the appropriate set of hypothesis for testing is:
A month is classified as "extremely wet" if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as "extremely wet".
Draw the OC curve. If the average number of defects increased by to 10 per tractor, what would the probability of detecting the shift in a control chart?
Give a possible description why serum cholesterol values for older males are lower than for younger males and reverse is true for females.
Stats Questions Set. Which of the following statements correctly compares the t -statistic to the z -score when creating a confidence interval?
What is the probability that all tree students pick a different card?
How large should n be so that a 90% confidence interval for µ has a margin of error and What is the P-value for a test of the hypotheses
Black Hole Pizza Parlor instructs its cooks to put a "handful" of cheese on each large pizza. A random sample of six such handfuls were weighed.
Using What's Best! (or Solver) determine the least-cost shipping schedule, where each of three (3) hardware vendors provide up to two hundred (200) units and each of six (6) buyers demand one hundred (100) units.
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