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Situation A: the manager of a fast-food restaurant wants to estimate the average service time needed to take a customer's order. he records service time for 50 randomly selected customers and obtains a mean of 181.0 seconds and a standard deviation of 82.1 seconds.
Suppose the manager decides to use a larger sample to find a more accurate confidence interval. how large of a sample would he need to estimate the mean service time to within 10 seconds with 95% confidence? (Use the standard deviation of the sample as an estimate for the population standard deviation).
Rickets. Vitamin D is essential for strong, healthy bones. Our bodies produce vitamin D naturally when sunlight falls upon the skin.
Develop a scatter diagram with price as the independent variable and what does the scatter diagram developed in part (a) indicate about the relationship between the two variables?
What are the traditional measures of firm profitability? What are the traditional measurements of a risky firm?
In the previous year, the true proportion of clothing orders shipped to other countries was believed to be 0.30.
She wants to be within .056 of the true proportion of defective parts with a 90% level of confidence. How large must the sample size be to guarantee this?
What kind of variance does the mean square within-groups (MSwg) reflect?- The sum of squares between-groups (SSbg).
How does the shape of the quantile plot affect your interpretation of the results?
A proposal has been made to design and implement physical modifications to the existing bus transit system infrastructure in a major city by providing new buses and terminals. Discuss some of the efficiency, effectiveness, and equity issues associ..
Calculate the correlation, and find and report the equation of the regression line, using height as the predictor and weight as the response.
If appropriate, use the Marascuilo procedure and α = .01 to determine which, if any, year groups are significantly different in the proportion of passengers who book tickets online.
Describe the assumptions that must hold true to apply the one-way analysis of variance procedure to test hypotheses.
suppose a sample of 19 scores has a mean of 67.43. two additional scores are added to the sample with values of 64.4
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