A growing body of studies challenges conventional assumptions that genetics or cultural differences lead some students such as indigenous or girls to do poorly on standardised academic tests and other academic performances. To examine the phenomenon associated with "stereotype threat", researchers gave two groups of 40 randomly selected indigenous students a standardised test, asking students in group A to indicate their ethnicity before taking the test. In contrast, students in group B started the test without revealing their race. On a \"IOUpoint scale, students' test scores were recorded in the EXCEL file TestScores.xlsx. Use EXCEL and an appropriate hypothesis test to help researchers to answer the following research question. Research Question: Was a negative stereotype activated simply by calling attention to one's race that might impact students' test performance? 1. [1 mark) The most appropriate test for these data is: 2. {1 mark) Which graphical display would be useful to check normality assumption for this hypothesis? A V . Figure 1 . Figure 2 . Figure 3 . Figure 4 . Figure 1 8L 2 . Figure 3 81 4 m-nI'I'IUUJP . No need to check normality assumption H. All four figures are needed 3. [1 mark) How can you check the assumption of equal variances? 0 A. Comparative boxplots could be used (e.g. if the sizes of boxes are similar or not) B. Descriptive statistics such as variance, standard deviation and range could be used C. Descriptive statistics such as mean and median could be used D. The histogram of differences could be used E. Both A 8: B could be used F. No need to check the assumption of equal variances For the remaining questions you may assume that any relevant assumptions have been met. 4. [2 marks) The absolute value of the test statistic is equal to {3dp} 5. (1 mark) The degrees of freedom is equal to (Integer) 6. (1 mark) The pvalue is larger than 0.05 7'. [2 marks) The test shows that the test scores were A. significantly different between Group A and Group B, possibly higher for Group A. B. significantly different between Group A and Group B, possibly higher for Group B. C. not significantly different between the two groups of students. 0