Iconic memory is a type of memory that holds visual information for about half a
ID: 3358781 • Letter: I
Question
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 of 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.
(a) Complete the F-table. (Round your values for MS and F to two decimal places.)
(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 for each pairwise comparison.
Which of the comparisons had significant differences? (Select all that apply.)
Recall following a half second delay was significantly different from recall following a one second delay.
Recall following no delay was significantly different from recall following a one second delay.
Recall following no delay was significantly different from recall following a half second delay.
The null hypothesis of no difference should be retained because none of the pairwise comparisons demonstrate a significant difference.
Delay Before Recall 0 0.5 1 7 3 7 7 11 5 10 8 3 8 4 2 11 4 3 11 6 4Explanation / Answer
The hypotheses of interest in an ANOVA are as follows:
anova calculation table is given is,
Source
SS
df
MS
Between-treatments
60.92
2
30.46
F = 2.99
Within-treatments
183.07
18
10.17
Total
244
20
B) Tukey's HSD post hoc test
k=3 groups
degrees of freedom for the error term =18
Critical values of the Studentized Range QQ statistic:
Tukey HSD results
treatments
pair
Tukey HSD
Q statistic
Tukey HSD
p-value
Tukey HSD
inferfence
A vs B
2.0740
0.3300572
insignificant
A vs C
3.4370
0.0634286
insignificant
B vs C
1.3629
0.6037013
insignificant
for the above result we can say that, the memory recall for all three time point are same.
Which of the comparisons had significant differences? (Select all that apply.)
-> The null hypothesis of no difference should be retained because none of the pairwise comparisons demonstrate a significant difference.
thanks
Source
SS
df
MS
Between-treatments
60.92
2
30.46
F = 2.99
Within-treatments
183.07
18
10.17
Total
244
20
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