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QUESTION 2 In a study of memory recall, 12 students were given ten minutes to memories a list of 20 word. Each student was then asked to list as many of the words as he or she could remember in two periods; Period 1 (one hour later) and Period 2 (24 hours later). The numbers of words listed correctly for each student are shown below. Paired Sample Statistics N Std. Deviation Std. Error Mean Pair 1 Period 1 12 3.962 1.144 Period 2 12 3.215 .928 Paired Samples Test Paired Differences Mean Std. Deviation | Std. Error Mean Pair 1 Period 1 - Period 2 4.5 1.446 Y Z 11 @ Hak Cipta Universiti Teknologi MARA CONFIDENTIAL CONFIDENTIAL 3 CS/JULY 2022/STA404 Based on SPSS output, a) Find the value of Y and Z (2 marks) b) At 5% level of significance, do the data provide sufficient evidence that the mean number of words correctly listed in Period 1 exceeds Period 2 by 2 words