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 | 5 | 2 |
| 11 | 4 | 5 |
| 5 | 9 | 7 |
| 7 | 7 | 3 |
| 6 | 3 | 4 |
| 10 | 8 | 3 |
(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 pairwisecomparison.
