The table contains a subset of data reported by Barasch and colleagues (2017). I

Question

The table contains a subset of data reported by Barasch and colleagues (2017). Identify the appropriate test to determine if taking photos of objects influences visual recognition (memory) of the objects compared with those who did not have a camera (and did not take take photos).

Table: Memory Scores for Photo and No Photo Groups

Note: Memory scores represent number of correct responses out of 9 total visual recognition questions

Photo

No Photo

5

7

7

4

8

4

7

5

6

4

7

4

6

6

7

Upload a .doc or .pdf file containing the following information (label each portion as "1," "2," etc):

1) Identify the appropriate hypothesis test needed to test for statistical significance and state WHY you chose that test.

Photo

No Photo

5

7

7

4

8

4

7

5

6

4

7

4

6

6

7

Explanation / Answer

here we use t-test with null hypothesis H0:mean1=mean2 and alternate hypothesis H1:mean1mean2

t=(mean1-mean2)/((sp*(1/n1 +1/n2)1/2) and sp2=((n1-1)s12+(n2-1)s22)/n and with df is n=n1+n2-2

let level of significance alpha=0.05 is more than two tailed p-value , so we fail to accept H0 and conclude that taking photos of objects influences visual recognition (memory) of the objects compared with those who did not have a camera

sample mean s s2 n (n-1)s2 photo 6.63 0.9161 0.83923921 8 5.87467447 no photo 4.86 1.2149 1.47598201 7 8.85589206 difference= 1.77 2.31522122 15 14.73056653 sp2= 1.133120502 sp= 1.06448133 t= 3.212799337 one tailed p-value= 0.003399003 two tailed p-value= 0.006798005

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