The scores for 21 students on an exam are summarized in the stemplot below. The teacher realizes that a mistake was made and the student whose score was recorded as 49% should have been 94%. If the mistake is corrected, what effect will this have on the mean and median scores? Exam Scores 4. 9 O The mean and median will both increase. O Neither the mean nor the median will change. O The mean will increase but the median will decrease. The mean will increase but the median will be unchanged. 5 О) Ол 6 1 9 7 1 2 5 5 6 7 8. 0 1 2 4 5 5 699 9 0 1 4 7 Key: 9|0 = 90% on the exam

Do social recommendations increase ad effectiveness? a study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media recommendation link to viewers who arrived at the same video by web browsing. data were collected on whether the viewer could correctly recall the brand being advertised after seeing the video. the results are given below.correctly recalled the brandarrival 409153browsing20484b. conduct the hypothesis test, using the 0.025 level of significance.what is the value of the test statistic? χ2stat=what is the p-value? p-value=is this value significant atα=0.025?