The following table shows retail sales in drug stores in billions of dollars in the U.S. for years since 1995. Year Retail Sales 0 85.851 3 108.426 6 141.781 9 169.256 12 202.297 15 222.266 Let S(t)S(t) be the retails sales in billions of dollars in t years since 1995. A linear model for the data is F(t)=9.44t+84.182F(t)=9.44t+84.182. 36912158090100110120130140150160170180190200210220 Use the above scatter plot to decide whether the linear model fits the data well. The function is not a good model for the data The function is a good model for the data. Estimate the retails sales in the U. S. in 2012. billions of dollars. Use the model to predict the year that corresponds to retails sales of $239 billion.
Question 5.
The following table shows retail sales in drug stores in billions of dollars in the U.S. for years since 1995.
| Year | Retail Sales |
|---|---|
| 0 | 85.851 |
| 3 | 108.426 |
| 6 | 141.781 |
| 9 | 169.256 |
| 12 | 202.297 |
| 15 | 222.266 |
Let S(t)S(t) be the retails sales in billions of dollars in t years since 1995. A linear model for the data is F(t)=9.44t+84.182F(t)=9.44t+84.182.
36912158090100110120130140150160170180190200210220
Use the above
- The
function is not a good model for the data - The function is a good model for the data.
Estimate the retails sales in the U. S. in 2012. billions of dollars.
Use the model to predict the year that corresponds to retails sales of $239 billion.
Question 7
Statistics students in Oxnard College sampled 9 textbooks in the Condor bookstore and recorded the number of pages in each textbook and its cost. The bivariate data are shown below:
| Number of Pages (xx) | Cost(yy) |
|---|---|
| 645 | 69.15 |
| 539 | 54.73 |
| 386 | 49.02 |
| 744 | 66.08 |
| 509 | 45.63 |
| 677 | 60.39 |
| 866 | 70.62 |
| 659 | 58.13 |
| 603 | 58.21 |
A student calculates a linear model
yy = xx + . (Please show your answers to two decimal places)
Use the model to estimate the cost when number of pages is 516.
Cost = $ (Please show your answer to 2 decimal places.)
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