# Need done tomorrow!!!! | Statistics homework help

Question 1

Assume you have noted the following prices for paperback books and the number of pages that each book contains.

Question 2

The following data represent a company’s yearly sales volume and its advertising expenditure over a period of 8 years.

Develop a scatter diagram of sales versus advertising and explain what it shows regarding the relationship between sales and advertising. Use the method of least squares to compute an estimated regression line between sales and advertising OR just show it on the graph along with the r-squared value. If the company’s advertising expenditure is \$400,000, what are the predicted sales? Give the answer in dollars.  (This is algebra using the equation of the trendline / regression line – make sure to watch your units)What does the slope of the estimated regression line indicate?

For these project assignments throughout the course you will need to reference the data in the ROI Excel spreadsheet. Download it here.
Using the ROI data set:*** The step-by-step directions for the assignment may also be applied here.
For each of the two majors: Draw the scatter diagram of Y = Annual % ROI against X = Cost.  Include the trendline (regression line) and the r-squared value (coefficient of determination).Obtain b0 and b1 of the regression equation defined as y Ì‚ = b0 + b1X.  (y intercept and slope)Calculate the estimated ˜Annual % ROI when the Cost(X) is \$160,000. (Algebra using the equation of the line) Test the hypothesis:   You will need to follow and show work for the steps you are taking – there are t tests, F tests… see the end of chapter 12 to make sure you are doing a comprehensive analysis…
H0: Î²1 = 0Ha: Î²1 â‰  0

Write a paragraph or more on any observations you make about the regression estimates, coefficient of determination, the plots, and the results of your hypothesis tests.  Please note the plural nature – paragraph or MORE, hypothesis tests….  One of the ways to help do this is to present the test, tell what it determines (what is the test for?) and then present your work and conclusions for that test.  Repeat this for each test.

Present the final summary of all you have determined at the end.