Iconic memory is a type of memory that holds visual information for about half a
ID: 3181343 • 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.)
A)The null hypothesis of no difference should be retained because none of the pairwise comparisons demonstrate a significant difference.
B)Recall following a half second delay was significantly different from recall following a one second delay.
C)Recall following no delay was significantly different from recall following a half second delay.
D)Recall following no delay was significantly different from recall following a one second delay.
Delay Before Recall 0 0.5 1 6 10 5 11 7 5 10 4 4 8 4 1 6 8 7 13 3 2Explanation / Answer
Answer:
a).
One factor ANOVA
Mean
n
Std. Dev
9.0
6
2.83
Delay 0
6.0
6
2.76
Before 0.5
4.0
6
2.19
Recall 1
6.3
18
3.24
Total
ANOVA table
Source
SS
df
MS
F
p-value
Treatment
76.00
2
38.00
5.59
.0154
Error
102.00
15
6.80
Total
178.00
17
Post hoc analysis
Tukey simultaneous comparison t-values (d.f. = 15)
Recall 1
Before 0.5
Delay 0
4.0
6.0
9.0
Recall 1
4.0
Before 0.5
6.0
1.33
Delay 0
9.0
3.32
1.99
critical values for experimentwise error rate:
0.05
2.60
0.01
3.42
(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 2.60 for each pairwise comparison.
Which of the comparisons had significant differences? (Select all that apply.)
Answer:
A)The null hypothesis of no difference should be retained because none of the pairwise comparisons demonstrate a significant difference.
D)Recall following no delay was significantly different from recall following a one second delay.
One factor ANOVA
Mean
n
Std. Dev
9.0
6
2.83
Delay 0
6.0
6
2.76
Before 0.5
4.0
6
2.19
Recall 1
6.3
18
3.24
Total
ANOVA table
Source
SS
df
MS
F
p-value
Treatment
76.00
2
38.00
5.59
.0154
Error
102.00
15
6.80
Total
178.00
17
Post hoc analysis
Tukey simultaneous comparison t-values (d.f. = 15)
Recall 1
Before 0.5
Delay 0
4.0
6.0
9.0
Recall 1
4.0
Before 0.5
6.0
1.33
Delay 0
9.0
3.32
1.99
critical values for experimentwise error rate:
0.05
2.60
0.01
3.42
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.