Mathematics, 05.05.2020 04:16 elricardo34
Martin wants to sell an illegal exam service on GroupMe, but business isn’t so good. Martin would like to know why! He collects two samples of exam scores for the same midterm: students who are using his service (Group 1), and students who are not using his service (Group 2). He notices that exams scores were actually lower for students using his service! :( Now, Martin wants to test if this difference is significant or not. He compiles the following summary statistics: Group 1: = 24, = 89.005. = 3.438 Group 2: = 34, = 91.864. = 3.305. (2 points) Perform a t-test to determine if this difference is significant, using Welch’s formula for degrees of freedom. Please show all work. Identify your test statistic, calculate its value and distribution under (show your work for the df calculation), p-value, and decision at . α = 0.001 α = 0.001 α = 0.01 151.8, 154.5, 154.5, 155.8, 156.7, 157.3, 159.1, 159.5, 160.4, 161.2, 161.8, 164.0, 164.9, 165.4, 170.2 α = 0.05 H0 α = 0.05 α = 0.05 α = 0.001 n1 x¯ sX n2 y¯ sY H0 α = 0.0
Answers: 3
Mathematics, 21.06.2019 18:20
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?
Answers: 2
Mathematics, 21.06.2019 21:50
Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?
Answers: 3
Martin wants to sell an illegal exam service on GroupMe, but business isn’t so good. Martin would li...
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