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A sample of 31 data points was collected from a population whose mean is 20 and standard deviation is 3. If a randomly selected data point is drawn, what is the probability that it is greater than 21?
a. 0.0314b. 0.9589c. 1.86d. 0.0101e. none of the above
A sample of 1545 men and an independent sample of 1691 women were used to compare the amount of housework done by men and women in dual-earner marriages.
Their resting heart rates were measured. A partial ANOVA table is given.
A quality inspector is interested in the time spent replacing defective parts in one of the company's products. The average time spent should be at most 20 minutes per day according to company standards.
How many men and women are needed to generate a 95% confidence interval estimate for the difference in proportions with a margin of error not exceeding 4%?
What symbol is used to represent the mean of the sampling distribution of y-(ybar)? Explain and what symbol is used to represent one value from the sampling distribution of y-(ybar)? Explain
Use a data to obtain 95% confidence interval using your formula from Number 7. Does your interval contain the correct value?
If the standard deviation is $89.46, find the probability that a randomly selected customer spends between $550.67 and $836.94.
Compute the median number of dependents?
Define the population. State the hypotheses for the study. Decide which statistical test is appropriate and compute the test statistic (z or t). Why is the test appropriate?
Calculate the appropriate test statistic to test the hypotheses related to the concern and test at 5% and 1% (indicate which test you are performing; show the hypotheses, the test statistic and the critical values and mention whether one-tailed or..
In the graphical method, how do you know when a problem is infeasible, unbounded, or when it has multiple optimal solutions? Give a real-world example of when you could have an infeasible problem.
Reliable Furniture is a family business that has been selling to retail customers in the Chicago area for many years. They advertise extensively on radio and TV, emphasizing their low prices and easy credit terms.
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