Iconic memory is a type of memory that holds visual information for about half a second (0.5 seconds). To demonstrate this type of memory, participants were shown three rows f four letters for 50 milliseconds. They were then asked to recall as many letters as possible,
with a 0., 0.5-, or 1.0-second delay before responding. Researchers hypothesized that longer delays would result in poorer recall. The
number of letters correctly recalled is given in the table.
Delay Before Recall
0 0.5 1
6
2
8
11
4
5
11
10
2
6
4
10
8
8
5
4
9
1
(a) Complete the F-table. (Round your values for MS and Fto two decimal places.)
SS
df
MS
Source of Variation
Between groups
Within groups (error)
15
Total
17
(b) Compute Tukey's HSD post hoc test and interpret the results. (Assume alpha equal to 0.05. Round your answer to two decimal
places.)
The critical value is 4 X for each pairwise comparison