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The average price of a car wash is $5.00. A sample of six car washes averaged $5.70 and had a sample standard deviation of $1.30. Assuming a normal population, use the critical value method to test the claim at a= 0.05.
Data is given in the table below. Process data as illustrate in the paper on the Mann-Whitney U test. Critical Value:Test Statistic (Show procedure.)Z .
How can we be certain that surveys and statistics that we hear about in the media are accurate samples and unbiased? Is there a way to dissect the information and determine if a probability sample was used?
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
Answer to a problem based on statistical graphics.Create a c-bar chart and determine if corrective action is needed.
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
Some people who bought X-game gaming systems complained about having received defective systems. The industry standard for such systems has been 98% non-defective systems.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the null hypothesis and the alternate hypothesis.
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
Name the inferential statistical test that would be used for the method of training and why?
The production department wants to explore the relationship between the number of employees who assemble a subassembly and the number produced. The complete set of paired observations follows:
Create a 98 percent confidence interval for the population mean.
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