6. Which of the following statement indicates that the regression line is a good
ID: 3317381 • Letter: 6
Question
6. Which of the following statement indicates that the regression line is a good fit a. Residuals are randomly scattered around a unit circle. b. There is no any pattern in the scatter plot of the two variables c. The slope is positive. d. The residual plot shows an unstructured horizontal band centered at zero e. Both (b) and (d). 7. Which of the following is needed to compute a confidence interval for the population mean? The median a. b. The confidence level The 2nd quartile d. c. The population mean e. Both (b) and (d) 8. If a significance test gives a P-value of 0.0125, we do have good evidence against the null hypothesis at the 1% significance level. b, we do not have good evidence against the null hypothesis at the 1% significance level. c, we accept the alternative hypothesis at the 1% significance level. d. the do not accept the alternative hypothesis at the 1% significance level. e. None of the above 9. Which of the following is not an appropriate statement about the p-value: a. P-value could be less than zero. b, P-value can never be greater than 100%. P-value could be close to 1, but it is always less than or equal to 1 . c. The P-value is the area under the sampling distribution for values at least as extreme, in the direction of Ha, as that of our random sample. Both (c) and (d) d. e. A test of the null hypothesis Hai verse alternative hypothesis Hai > 0 gives test statistic z =-2.34. a. we conclude that the null hypothesis and the alternative hypothesis are the same. b, we reject the null hypothesis at the 5% significance level. c, we fail to reject the null hypothesis at the 5% significance level. d, were ect the alternative hypothesis at the 5% significance level. e. None of the above The margin of error of a confidence interval for the population mean decreases as a. the confidence level C increases. b. the sample size n increases. c, the population standard deviation increases. d. Population proportion decreases. e. None of the above. 11.Explanation / Answer
6) OPTION D
7) OPTION E
8) OPTION B
9) OPTION D
10) OPTION B
11) AS SAMPLE SIZE INCREASES.
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