Iconic memory is a type of memory that holds visual informationfor about half a second (0.5 seconds). To demonstrate this type ofmemory, participants were shown three rows of four letters for 50milliseconds. They were then asked to recall as many letters aspossible, with a 0-, 0.5-, or 1.0-second delay before responding.Researchers hypothesized that longer delays would result in poorerrecall. The number of letters correctly recalled is given in thetable.

Delay BeforeRecall
0	0.5	1
9	4	7
8	5	2
10	5	4
5	9	4
6	3	2
10	10	5

(a) Complete the F-table. (Round your values forMS and F to two decimal places.)

Source ofVariation	SS	df	MS	F
Betweengroups
Withingroups (error)
Total

(b) Compute Tukey's HSD post hoc test and interpret the results.(Assume alpha equal to 0.05. Round your answer to two decimalplaces.)

The critical value is _____ for each pairwise comparison.

Which of the comparisons had significant differences? (Select allthat apply.)

a) The null hypothesis of no difference should be retainedbecause none of the pairwise comparisons demonstrate a significantdifference.

b) Recall following a half second delay was significantlydifferent from recall following a one second delay.

c) Recall following no delay was significantly different fromrecall following a half second delay.

d) Recall following no delay was significantly different fromrecall following a one second delay.