Now, the same researcher in Question 1 is about to estimate the average life expectancy for Wisconsinites from a sample of 50 Wisconsinites. From the same sample, she still finds that the average life expectancy is 76.7. For this time, however, she has no information about the population standard deviation. Now, find the value on the t-distribution that should be used in constructing the 95% confidence interval. The number is t0.025,49. (Hint: See the recording of Exercise 1 on slide 14 in the part 2 lecture. Use =T.INV(cumulativeprobability, df) formula in Excel.)