i dont understand how to do these questions. this is just homework and homework for this class is not graded only the tests. im just trying to learn how to do it before the test

Provided below are summary statistics for independent simple random samples from two populations. Preliminary data analyses indicate that the variable under consideration is normally distributed on each population. Decide whether use of the pooled t-test and pooled t-interval procedure is reasonable. x1=173,s1=13.8,n1=17,)_(2 =169, 52 =41.5, n2 =7 ls use of the pooled ttest and pooled t-interval procedure reasonable or not reasonable? 0 Not reasonable 0 Reasonable A group of 8 students were given the same standardized test twice to see whether retaking the test affected the score. The table gives the score differences for the 8 students. Use the paired t-interval procedure to determine a 98_% condence interval for the difference between the mean scores on the first test and the second test (retake). (Note: d = 17.5 and sd = 52.03.) The 98% condence interval is from to (Round to two decimal places as needed.) -40 40 80 20 20 '3 - 50 90 20