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1. Given the following sample data:
x
420
610
625
500
400
450
550
650
480
565
y
2.80
3.60
3.75
3.00
2.50
2.70
3.50
3.90
2.95
3.30
a. Calculate the covariance and the correlation coefficient.
b. Comment on the relationship between X and Y.
c. Determine the least-squares regression line (Use Excel data analysis toolpak).
d. Draw the scatter diagram and plot the least-squares line.
2. A car dealer wants to find the relationship between the odometer reading and the selling price of used cars. A random sample of 100 cars is selected and the data are recorded in the Excel file XM18-03. Estimate a linear relationship between price and odometer reading. Calculate the standard error of estimate and describe what it tells you about the model fit. Find the coefficient of determination. What does this statistic tell you about the model?
Respond to the following to describe a scenario where a researcher might use a Goodness of Fit Test, a Test for Independence, or an Analysis of Variance to investigate a research question.
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Characteristics on patients participating in a clinical trial.
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A survey of people in Iowa showed that 40 out of 400 prefer watching TV comedy shows. Another survey in Colorado showed that 90 out of 600 prefer watching TV comedy shows. At a 1% significance level, would it seem that the true proportions of p..
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Use these data to develop an estimated regression equation that could be used topredict the total cost for a given production volume and what is the variable cost per unit produced
Let's say we have a population comprised of four typists with the following numbers of errors per page of a manuscript: Stephanie X1=3
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Can you please show me step by step how to solve Statistics for Business and Economics, 12 edition, Case Studies: Air Force Training Program (pg. 503-504) and Wentworth Medical Center (pg. 591-592)?
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