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2:12 PM Tue Dec 13 293% 5. Given the least squares regression line =3-X (^=3-X. Which of the following is true? A. As x increases, so does y. B. The coefficient of determination is negative. C. The correlation coefficient is negative. D. As x decreases, so does y 6. Given all the other variables are held constant, what effect would increasing the sample size have on a confidence interval? A. The confidence interval would increase in size. B. The confidence interval would decrease in size. C. The confidence interval is unaffected by sample size. D. The confidence interval could either increase or decrease in size. 7. The average life span in Ontario in 2009 was 81.3 years. A random sample of 17 obituaries from newspapers in Ontario showed x = 82.5 and s = 2.6. If lifespan is assumed to be normally distributed, does this sample provide sufficient evidence to support that the average lifespan in Ontario has increased at the 1% significance level. A. What are the null and alternative hypotheses? (Type "mu" for the symbol u, "xbar" for the symbol x , "p" for the symbol p, or "phat" for the symbol p^, e.g. mu > 0.5 for the mean is greater than 0.5, xbar 30 observations C. 10+ observed successes and failures D. equal or constant variance E. observations must be normally distributed F. normally distributed residuals G. no extreme skew or outliers H. observations should come from a symmetric distribution I. linearity J. heteroskedasticity K. 10+ expected successes and failures L. independence (sample size