c. What kind of test could she use to compare the time to event in the two treatment groups? 4. (20 pts) True or false: a)ln a regression of y on x, if the p- value for the intercept is 0.01, then there is a statistically significant association between x and y. b)Rank tests should not be used if data are not normally distributed. c)The standard error helps us determine how far off an estimator might be from what it is trying to estimate. d)An outlier tends to cause more problems in a rank test than in a t- test. e)An F-test should not be used to compare more than 4 groups. f) if the sensitivity of a screening test is 95% and the disease is very rare, then the probability you have the disease, given that you got a positive test, will also be close to 95%. g) A condence interval for a single mean gives a range of plausible values for the sample mean. h) In logistic regression of y on x, the regression coefcient is the odds ratio for a 1 unit increase in x. i) In survival analysis, censored observations should be eliminated before any analyses are conducted. j) If a 95% condence interval for a difference in mean blood pressure between treatment and placebo groups is (-3.68, -0.93), then a 2-tailed test at alpha=.05 would reject the null hypothesis that the groups are thesame