Question 28 (1.5 points) In doing paired-samples t-test for a pretest-posttest e

Question

Question 28 (1.5 points) In doing paired-samples t-test for a pretest-posttest evaluation study involving 25 clients, a researcher first calculates the the difference of scores from the pretest to the posttest for each client. Suppose that the standard deviation of the difference scores is 5. Also suppose that the difference of sample means is t.5. Answer the following two questions: (a) What is the estimated standard error that is needed to calculate the t-statistic? (b) what is the t-statistic? 1, 1.5 2, 1.5 O 0.4, 1 Save Question 29 (1,5 points)

Explanation / Answer

a)

estimated std error =std deviation/sqrt(n)=5/sqrt(25)=1

b)test statistic =(X-mean)/std error =(1.5-0)/1 =1.5

correct option is : 1 , 1.5

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