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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.
Determine a 95% confidence interval for true time battery pack can function before having to be recharged.
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
Compute SS, variance, and standard deviation for following population of N = 7.Scores: 8, 1, 4, 3, 5, 3, and 4. The definitional formula works well with these scores. Use the definitional formula to compute SS.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Create a 90% confidence interval for true mean amount of cholesterol in chicken eggs.
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
A study published in the New England Journal of Medicine (Aug. 2001) suggests that it's dangerous to enter a hospital on a weekend. During a 10-year period, researchers tracked over 4 million emergency admissions to hospitals in Ontario, Canada. T..
Calculated test statistic, decision about the null hypothesis interpretation of results, and a list of references consulted.
Verify value of t for the independent Variable, using formula. (That is, using formula in the Formula Sheet compute the t statistic , given data provided in the print out).
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
What is the probability for the given frequency distribution?
Make up a scatter diagram with 10 dots for each of the following:
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