QUESTION 5 Here is a link to a data set concerning treatment groups A and B Befo

Question

QUESTION 5 Here is a link to a data set concerning treatment groups A and B Before performing a t-test to determine if the two groups are different, researchers must first ascertain if the variance in the two groups is the same using an F test Indicate whether the hypothesis below is the null or alternate hypothesis for the F test. The variance in group A is equal to the variance in group B Calculate the F statistic for this data set and report it in the box below, rounded to two decimal places Use the formula =(1-(f dist(F df1 df2true) in Excel to calculate the P value for the F statistic and report it in the box below. Do not use the rounded value for F when calculating the P value. Use the value in the spreadsheet that has not been rounded Based on this p value, would you recommend using a Student's t test or a Welch's t test to determine if the two treatment groups have different means? Enter either Student's or Welch's in the box below.

Explanation / Answer

1. Null hypothesis is rejected and alternate hypothesis is accepted. Variance of group A and B are not equal.

2. F statistic = variance 2/ variance 1 = 1.731

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