The Excel file STATISTICSSTUDENTSSURVEYFORR contains the column YRAGE (a numerical variable that measures student age in years) and the column RNGOOD (a categorical variable that measures whether the student feels Rachel Notley is doing a good job (No, Yes) ). For education purposes, assume that the two groups are two independent samples from a much larger normal population for statistics students and that the populations have unequal variances . Using the difference µNo- µYes, calculate the appropriate 90% two sided confidence interval for the difference, on average, of the student ages in years for the No and Yes groups. Choose the most correct (closest) answer.
a. Your confidence interval is (-2.6357319, 0.1268033) and there is significant evidence that no and yes groups have significantly different ages, on average.
b. Your confidence interval is (-2.6357319, 0.1268033) and there is no significant evidence that no and yes groups have significantly different ages, on average.
c. Your confidence interval is (-2.9108604, 0.4019318) and there is significant evidence that no and yes groups have significantly different ages, on average.
d. Your confidence interval is (-2.9108604, 0.4019318) and there is no significant evidence that no and yes groups have significantly different ages on average.