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D Question 18 3 pts A high school teacher was interested in seeing if a math help video improved exam scores. She had the students take a test, watch the video and then take another test. She had ten students participate. What value of t should be used for a 95% confidence interval? O 2.086 O 2.093 O 2.228 O 2.262 O 1.6 D Question 19 3 pts In 1998, the General Social Survey asked participants if they had felt sad more than 1 day this week. Out of 776 females, 330 said yes. Out of 678 males, 238 said yes. For the hypothesis, Ho:p1-P2=0 versus Ha: P1-P2 >0, what is the value of the pooled proportion? O 0.41 O 0.42 O 0.39 O 0.40 Unknown