A)

A nationally representative survey of students in grades F to 12 asked about the experience of these students with respect to bullying. Cine question asked how many times the student had witnessed bullying in school. Following table contains the standardised residuals for this data. Examine the residuals and select where the association is from the following choices. ? You may select more than one answers. Boys Girls More 4.153 9 2.145 Neve r - 1.3?1 - 2.559 Dnce 43.315 -2.315 E] Between Girls and Once C] Between Girls and More E] Between Boys and More C] Between Boys and Once E] Between Boys and Never E] Between Girls and Never A lecturer wants to determine whether there is a relationship between the stream of the student and the class he/she attends. Following is the contigency table for the number of students who attend each class from each stream. The null hypothesis that stream and class are independent was tested. Calculate the degrees of freedom of the distribution of the appropriate test statistic if the null hypothesis is true. Class_A Class_B Class_C Class_D Stream_1 50 83 55 59 Stream_2 70 86 79 65 Stream_3 69 90 81 98 Stream_4 67 75 58 85We compared the number of returned or not returned lost wallets with no money and with money. The following table summarizes the data used in that comparison: Money No_Money Returned 47 97 Not_returned 103 55 Calculate the Chi-square contribution of the cell for [Money, Returned] if the money in the wallet and returning the wallet are independent. Consider the expected cell count for [Money, Returned] as 71.523 for your caculations. Round your final answer to 3 decimal places