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Q 134.

Expert-verifiedFound in: Page 589

Book edition
9th

Author(s)
Weiss, Neil

Pages
590 pages

ISBN
9780321989505

** Birdies and Score**. The data from Exercise 14.34 for number of birdies during a tournament and final score of 63 women golfers are on the WeissStats site. Do the data provide sufficient evidence to conclude that, for women golfers, number of birdies and score are negatively linearly correlated?

the data provide sufficient evidence to conclude that for women golfers number of birdies and score are negatively linearly correlated.

The data from Exercise 14.34 for number of birdies during a tournament and final score of 63 women golfers are on the WeissStats site.

Check whether reasonably to apply the correlation $t$-test procedure to data by using Exercise 14.34.

- From the residual plot, it is clear that the residuals are fall in the horizontal band.

- From the normal probability plot of residuals, it is clear that the residuals are in the linear pattern.

Hence, the assumptions for the regression inferences are not violated for the variables birdies and scores.

The test hypotheses are as follows:

Null hypothesis:

${H}_{0}:\rho =0$

That is, the data does not provide sufficient evidence to conclude that for women golfers number of birdies and score are negatively linearly correlated.

Alternative hypothesis:

${H}_{a}:\rho <0$

That is, the data provide sufficient evidence to conclude that for women golfers number of birdies and score are negatively linearly correlated.

Obtain the correlation and $p$-value between BIRDIES and SCORE by using **MINITAB.**

MINITAB procedure:

Step 1: Select** Stat >Basic Statistics > Correlation.**

Step 2: In Variables, select **BIRDIES and SCORE **from the box on the left.

Step 3: Click **OK.**

** MINITAB output: **

**Conclusion:**

Use the significance level, $\alpha =0.05$

Here, $p$-value is less than the level of significance.

That is, $p$-value $(=0.000)<\alpha (=0.05)$.

Therefore, by the rejection rule, it can be concluded that there is evidence to reject the null hypothesis $\left({H}_{0}\right)$ at $\alpha =0.05$.

That is, the data provide sufficient evidence to conclude that for women golfers number of birdies and score are negatively linearly correlated.

14.94 Custom Homes. Following are the size and price data for custom homes from Exercise 14.24.

x | 26 | 27 | 33 | 29 | 29 | 34 | 30 | 40 | 22 |

y | 540 | 555 | 575 | 577 | 606 | 661 | 738 | 804 | 496 |

a. Determine a point estimate for the mean price of all $2800-sq.ft.$Equestrian Estate homes.b. Find a $99\%$ confidence interval for the mean price of al $2800-sq.ft.$Equestrian Estate homes.c. Find the predicted price of a $2800-sq.ft.$Equestrian Estate homed. Determine a $99\%$prediction interval for the price of a $2800-sq.ft$ Equestrian Estate home.

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