Question

In a study of memory recall, 8 students from a large psychology class were selected at random and given 10 minutes to memorize a list of 20 nonsensical words. Each was asked to list as many of the words as he or she could remember both 1 hour and 24 hours later. The data are as shown in the accompanying table B Student 1 2 3 4 5 6 7 1 hour later 15 13 10 12 15 24 hours later 10 - 13 10 13 11 Use these data to estimate the difference in mean number of words remembered after 1 hour and after 24 hours. Use a 90% confidence interval. (Use #=Mi hour later - My hours later Use a table or technology. Round your answers to two decimal places.) words

Answer 1

S.NO A(1 hr) B(24 hrs) d=A-B 1 5 15 13 10 4 N 3 13 18 8 9 5 2 3 st 6 10 (d-d BAR)^2 0.140625 19.140625 0.140625 6.890625 2.640625 0.390625 0.140625 0.390625 29.875 13 9 4 5 6 7 8 5 13 Ол 18 15 11 4 SUM 37 MEAN 4.625

8-1 n=8 Given data 29.875 a = 4.625 SS - 29.875 - If=n-1 8-1 =7 To 2.06588 90% = 0.9 dol-0.9 0.1 te= tal, df = tooor = 1.995 (From 7 table at:df: 76005) 90% EI I z te in 206588 = 4:625 I 1895 x x Ź 4.625 + 1.384 = 3,241 0 6.009 90% CI . 3.24.7 6.01