Fill in the blank. Some research has indicated that as people age they need less sleep. A random sample of adults was selected and the number of hours that they slept last night was recorded. Simple regression analysis was performed on this sample and the results are given. According to these regression results, the average number of hours that a person who is 40 years old is . Round to one decimal place as needed. Click the icon to view the summary output. Summary Output - X O A. 6.8 O B. 7.7 SUMMARY OUTPUT O C. 7.1 O D. 8.4 Regression Statistics Multiple R 0.390730855 R Square 0.152670601 Adjusted R Square 0.112321582 Standard Error 0.8419499 Observations 23 ANOVA of SS MS F Significance F Regression 1 2.68222332 2.682223 3.78375 0.06526371 Residual 21 14.88647233 0.70888 Total 22 17.56869565 Coefficients Standard Error t Stat P-value Lower 90.0% Upper 90.0% Intercept 8.7660 0.659009748 13.30179 1.07E-11 7.632021559 9.899994251 Age -0.0257 0.013233234 -1.94519 0.065264 -0.048512101 -0.002970113 Print DoneFill in the blank. Costco sells paperback books in their retail stores and wanted to examine the relationship between price and demand. The price of a particular novel was adjusted each week and the weekly sales were recorded in the given table. Management would like to use simple regression analysis to estimate weekly demand for this novel using the price of the novel. The coefficient of determination for this sample is . Round to three decimal places as needed. Click the icon to view the sales data. X i Sales Data O A. 0.336 O B. 0.881 Sales Price O C. 0.830 3 $12 $11 O D. 0.624 6 $10 10 $9 $8 10 $7