spss

1. SORT CASES BY Practice.
SPLIT FILE SEPARATE BY Practice.
EXAMINE VARIABLES=Comprehension BY Noise
/PLOT NPPLOT
/STATISTICS DESCRIPTIVES
/CINTERVAL 95
/MISSING LISTWISE
/NOTOTAL.
Explore
Notes
Output Created 19-DEC-2021 16:22:13
Comments
Input Active Dataset DataSet0
Filter <none>
Weight <none>
Split File Practice
N of Rows in Working
Data File
30
Missing Value
Handling
Definition of Missing User-defined missing
values for dependent
variables are treated as
missing.
Cases Used Statistics are based on
cases with no missing
values for any
dependent variable or
factor used.
Syntax EXAMINE
VARIABLES=Comprehe
nsion BY Noise
/PLOT NPPLOT
/STATISTICS
DESCRIPTIVES
/CINTERVAL 95
/MISSING LISTWISE
/NOTOTAL.
Resources Processor Time 00:00:04.69
Elapsed Time 00:00:05.78
[DataSet0]

2. Practice = No practice
Level of background
Case Processing Summarya
Level of
background
Cases
Valid Missing Total
N Percent N Percent N Percent
Reading
comprehension
No noice 5 100.0% 0 0.0% 5 100.0%
Low noice 5 100.0% 0 0.0% 5 100.0%
High noice 5 100.0% 0 0.0% 5 100.0%
a. Practice = No practice
Descriptivesa
Level of background Statistic Std. Error
Reading
comprehension
No noice Mean 13.80 .663
95% Confidence
Interval for Mean
Lower Bound 11.96
Upper Bound 15.64
5% Trimmed Mean 13.78
Median 14.00
Variance 2.200
Std. Deviation 1.483
Minimum 12
Maximum 16
Range 4
Interquartile Range 3
Skewness .552 .913
Kurtosis .868 2.000
Low noice Mean 12.60 .600
95% Confidence
Interval for Mean
Lower Bound 10.93
Upper Bound 14.27
5% Trimmed Mean 12.61
Median 12.00
Variance 1.800
Std. Deviation 1.342
Minimum 11
Maximum 14
Range 3
Interquartile Range 3
Skewness .166 .913
Kurtosis -2.407 2.000
High noice Mean 11.40 .872

3. 95% Confidence
Interval for Mean
Lower Bound 8.98
Upper Bound 13.82
5% Trimmed Mean 11.39
Median 12.00
Variance 3.800
Std. Deviation 1.949
Minimum 9
Maximum 14
Range 5
Interquartile Range 4
Skewness .081 .913
Kurtosis -.817 2.000
a. Practice = No practice
Tests of Normalitya
Level of
background
Kolmogorov-Smirnovb Shapiro-Wilk
Statistic df Sig. Statistic df Sig.
Reading
comprehension
No noice .246 5 .200* .956 5 .777
Low noice .273 5 .200* .852 5 .201
High noice .221 5 .200* .953 5 .758
*. This is a lower bound of the true significance.
a. Practice = No practice
b. Lilliefors Significance Correction

4. Reading comprehension
Normal Q-Q Plots

5. Detrended Normal Q-Q Plots

6. Practice = Practice

7. Level of background
Case Processing Summarya
Level of
background
Cases
Valid Missing Total
N Percent N Percent N Percent
Reading
comprehension
No noice 5 100.0% 0 0.0% 5 100.0%
Low noice 5 100.0% 0 0.0% 5 100.0%
High noice 5 100.0% 0 0.0% 5 100.0%
a. Practice = Practice
Descriptivesa
Level of background Statistic Std. Error
Reading
comprehension
No noice Mean 18.00 .548
95% Confidence
Interval for Mean
Lower Bound 16.48
Upper Bound 19.52
5% Trimmed Mean 17.94
Median 18.00
Variance 1.500
Std. Deviation 1.225
Minimum 17
Maximum 20
Range 3
Interquartile Range 2
Skewness 1.361 .913
Kurtosis 2.000 2.000
Low noice Mean 16.80 .583
95% Confidence
Interval for Mean
Lower Bound 15.18
Upper Bound 18.42
5% Trimmed Mean 16.83
Median 17.00
Variance 1.700
Std. Deviation 1.304
Minimum 15
Maximum 18
Range 3
Interquartile Range 3
Skewness -.541 .913
Kurtosis -1.488 2.000
High noice Mean 12.20 .917
95% Confidence
Interval for Mean
Lower Bound 9.66
Upper Bound 14.74
5% Trimmed Mean 12.22
Median 13.00
Variance 4.200

8. Std. Deviation 2.049
Minimum 10
Maximum 14
Range 4
Interquartile Range 4
Skewness -.441 .913
Kurtosis -3.163 2.000
a. Practice = Practice
Tests of Normalitya
Level of
background
Kolmogorov-Smirnovb Shapiro-Wilk
Statistic df Sig. Statistic df Sig.
Reading
comprehension
No noice .300 5 .161 .833 5 .146
Low noice .221 5 .200* .902 5 .421
High noice .258 5 .200* .782 5 .057
*. This is a lower bound of the true significance.
a. Practice = Practice
b. Lilliefors Significance Correction
Reading comprehension
Normal Q-Q Plots

10. Detrended Normal Q-Q Plots

11. SPLIT FILE OFF.
DATASET ACTIVATE DataSet0.
UNIANOVA Comprehension BY Practice Noise
/METHOD=SSTYPE(3)
/INTERCEPT=INCLUDE
/PLOT=PROFILE(Practice*Noise) TYPE=LINE ERRORBAR=NO MEANREFERENCE=NO YAXIS=AUTO
/EMMEANS=TABLES(Practice) COMPARE ADJ(LSD)
/EMMEANS=TABLES(Noise) COMPARE ADJ(LSD)
/EMMEANS=TABLES(Practice*Noise) COMPARE(Practice)/EMMEANS=TABLES(Practice*Noise)
COMPARE(Noise)
/EMMEANS=TABLES(Practice*Noise)
/PRINT ETASQ DESCRIPTIVE HOMOGENEITY
/CRITERIA=ALPHA(.05)
/DESIGN=Practice Noise Practice*Noise.

12. Univariate Analysis of Variance
Notes
Output Created 19-DEC-2021 16:51:43
Comments
Input Active Dataset DataSet0
Filter <none>
Weight <none>
Split File <none>
N of Rows in Working
Data File
30
Missing Value
Handling
Definition of Missing User-defined missing
values are treated as
missing.
Cases Used Statistics are based on
all cases with valid data
for all variables in the
model.

13. Syntax UNIANOVA
Comprehension BY
Practice Noise
/METHOD=SSTYPE(3)
/INTERCEPT=INCLUDE
/PLOT=PROFILE(Practi
ce*Noise) TYPE=LINE
ERRORBAR=NO
MEANREFERENCE=N
O YAXIS=AUTO
/EMMEANS=TABLES(Pr
actice) COMPARE
ADJ(LSD)
/EMMEANS=TABLES(N
oise) COMPARE
ADJ(LSD)
/EMMEANS=TABLES(Pr
actice*Noise)
COMPARE(Practice)/EM
MEANS=TABLES(Practi
ce*Noise)
COMPARE(Noise)
/EMMEANS=TABLES(Pr
actice*Noise)
/PRINT ETASQ
DESCRIPTIVE
HOMOGENEITY
/CRITERIA=ALPHA(.05)
/DESIGN=Practice
Noise Practice*Noise.
Resources Processor Time 00:00:00.61
Elapsed Time 00:00:00.70
Between-Subjects Factors
Value Label N
Practice 0 No practice 15
1 Practice 15
Level of
background
0 No noice 10
1 Low noice 10
2 High noice 10

14. Descriptive Statistics
Dependent Variable: Reading comprehension
Practice
Level of
background Mean
Std.
Deviation N
No practice No noice 13.80 1.483 5
Low noice 12.60 1.342 5
High noice 11.40 1.949 5
Total 12.60 1.805 15
Practice No noice 18.00 1.225 5
Low noice 16.80 1.304 5
High noice 12.20 2.049 5
Total 15.67 2.968 15
Total No noice 15.90 2.558 10
Low noice 14.70 2.541 10
High noice 11.80 1.932 10
Total 14.13 2.874 30
Levene's Test of Equality of Error Variancesa,b
Levene
Statistic df1 df2 Sig.
Reading
comprehension
Based on Mean 1.127 5 24 .373
Based on Median .400 5 24 .844
Based on Median and
with adjusted df
.400 5 20.061 .843
Based on trimmed
mean
1.107 5 24 .383
Tests the null hypothesis that the error variance of the dependent variable is equal across
groups.
a. Dependent variable: Reading comprehension
b. Design: Intercept + Practice + Noise + Practice * Noise
Tests of Between-Subjects Effects
Dependent Variable: Reading comprehension
Source
Type III Sum
of Squares df
Mean
Square F Sig.
Partial Eta
Squared
Corrected
Model
178.667a 5 35.733 14.105 .000 .746
Intercept 5992.533 1 5992.533 2365.474 .000 .990
Practice 70.533 1 70.533 27.842 .000 .537
Noise 88.867 2 44.433 17.539 .000 .594
Practice * Noise 19.267 2 9.633 3.803 .037 .241
Error 60.800 24 2.533
Total 6232.000 30
Corrected Total 239.467 29
a. R Squared = .746 (Adjusted R Squared = .693)

15. Estimated Marginal Means
1. Practice
Estimates
Dependent Variable: Reading comprehension
Practice Mean Std. Error
95% Confidence Interval
Lower Bound Upper Bound
No practice 12.600 .411 11.752 13.448
Practice 15.667 .411 14.818 16.515
Pairwise Comparisons
Dependent Variable: Reading comprehension
(I) Practice (J) Practice
Mean
Difference (I-
J) Std. Error Sig.b
95% Confidence Interval for
Differenceb
Lower Bound Upper Bound
No practice Practice -3.067* .581 .000 -4.266 -1.867
Practice No practice 3.067* .581 .000 1.867 4.266
Based on estimated marginal means
*. The mean difference is significant at the .05 level.
b. Adjustment for multiple comparisons: Least Significant Difference (equivalent to no
adjustments).
Univariate Tests
Dependent Variable: Reading comprehension
Sum of
Squares df
Mean
Square F Sig.
Partial Eta
Squared
Contrast 70.533 1 70.533 27.842 .000 .537
Error 60.800 24 2.533
The F tests the effect of Practice. This test is based on the linearly independent
pairwise comparisons among the estimated marginal means.

16. 2. Level of background
Estimates
Dependent Variable: Reading comprehension
Level of
background Mean Std. Error
95% Confidence Interval
Lower Bound Upper Bound
No noice 15.900 .503 14.861 16.939
Low noice 14.700 .503 13.661 15.739
High noice 11.800 .503 10.761 12.839
Pairwise Comparisons
Dependent Variable: Reading comprehension
(I) Level of
background
(J) Level of
background
Mean
Difference (I-
J) Std. Error Sig.b
95% Confidence Interval for
Differenceb
Lower Bound Upper Bound
No noice Low noice 1.200 .712 .105 -.269 2.669
High noice 4.100* .712 .000 2.631 5.569
Low noice No noice -1.200 .712 .105 -2.669 .269
High noice 2.900* .712 .000 1.431 4.369
High noice No noice -4.100* .712 .000 -5.569 -2.631
Low noice -2.900* .712 .000 -4.369 -1.431
Based on estimated marginal means
*. The mean difference is significant at the .05 level.
b. Adjustment for multiple comparisons: Least Significant Difference (equivalent to no adjustments).
Univariate Tests
Dependent Variable: Reading comprehension
Sum of
Squares df
Mean
Square F Sig.
Partial Eta
Squared
Contrast 88.867 2 44.433 17.539 .000 .594
Error 60.800 24 2.533
The F tests the effect of Level of background. This test is based on the linearly
independent pairwise comparisons among the estimated marginal means.

17. 3. Practice * Level of background
Estimates
Dependent Variable: Reading comprehension
Practice
Level of
background Mean Std. Error
95% Confidence Interval
Lower Bound Upper Bound
No practice No noice 13.800 .712 12.331 15.269
Low noice 12.600 .712 11.131 14.069
High noice 11.400 .712 9.931 12.869
Practice No noice 18.000 .712 16.531 19.469
Low noice 16.800 .712 15.331 18.269
High noice 12.200 .712 10.731 13.669
Pairwise Comparisons
Dependent Variable: Reading comprehension
Level of
background (I) Practice (J) Practice
Mean
Difference (I-
J) Std. Error Sig.b
95% Confidence Interval for
Differenceb
Lower Bound Upper Bound
No noice No practice Practice -4.200* 1.007 .000 -6.278 -2.122
Practice No practice 4.200* 1.007 .000 2.122 6.278
Low noice No practice Practice -4.200* 1.007 .000 -6.278 -2.122
Practice No practice 4.200* 1.007 .000 2.122 6.278
High noice No practice Practice -.800 1.007 .435 -2.878 1.278
Practice No practice .800 1.007 .435 -1.278 2.878
Based on estimated marginal means
*. The mean difference is significant at the .05 level.
b. Adjustment for multiple comparisons: Least Significant Difference (equivalent to no adjustments).
Univariate Tests
Dependent Variable: Reading comprehension
Level of background
Sum of
Squares df
Mean
Square F Sig.
Partial Eta
Squared
No noice Contrast 44.100 1 44.100 17.408 .000 .420
Error 60.800 24 2.533
Low noice Contrast 44.100 1 44.100 17.408 .000 .420
Error 60.800 24 2.533
High noice Contrast 1.600 1 1.600 .632 .435 .026
Error 60.800 24 2.533
Each F tests the simple effects of Practice within each level combination of the other effects shown.
These tests are based on the linearly independent pairwise comparisons among the estimated
marginal means.

18. 4. Practice * Level of background
Estimates
Dependent Variable: Reading comprehension
Practice
Level of
background Mean Std. Error
95% Confidence Interval
Lower Bound Upper Bound
No practice No noice 13.800 .712 12.331 15.269
Low noice 12.600 .712 11.131 14.069
High noice 11.400 .712 9.931 12.869
Practice No noice 18.000 .712 16.531 19.469
Low noice 16.800 .712 15.331 18.269
High noice 12.200 .712 10.731 13.669
Pairwise Comparisons
Dependent Variable: Reading comprehension
Practice
(I) Level of
background
(J) Level of
background
Mean
Difference (I-
J) Std. Error Sig.b
95% Confidence Interval for
Differenceb
Lower Bound Upper Bound
No practice No noice Low noice 1.200 1.007 .245 -.878 3.278
High noice 2.400* 1.007 .025 .322 4.478
Low noice No noice -1.200 1.007 .245 -3.278 .878
High noice 1.200 1.007 .245 -.878 3.278
High noice No noice -2.400* 1.007 .025 -4.478 -.322
Low noice -1.200 1.007 .245 -3.278 .878
Practice No noice Low noice 1.200 1.007 .245 -.878 3.278
High noice 5.800* 1.007 .000 3.722 7.878
Low noice No noice -1.200 1.007 .245 -3.278 .878
High noice 4.600* 1.007 .000 2.522 6.678
High noice No noice -5.800* 1.007 .000 -7.878 -3.722
Low noice -4.600* 1.007 .000 -6.678 -2.522
Based on estimated marginal means
*. The mean difference is significant at the .05 level.
b. Adjustment for multiple comparisons: Least Significant Difference (equivalent to no adjustments).
Univariate Tests
Dependent Variable: Reading comprehension
Practice
Sum of
Squares df
Mean
Square F Sig.
Partial Eta
Squared
No practice Contrast 14.400 2 7.200 2.842 .078 .191
Error 60.800 24 2.533
Practice Contrast 93.733 2 46.867 18.500 .000 .607
Error 60.800 24 2.533

19. Each F tests the simple effects of Level of background within each level combination of the other
effects shown. These tests are based on the linearly independent pairwise comparisons among the
estimated marginal means.
5. Practice * Level of background
Dependent Variable: Reading comprehension
Practice
Level of
background Mean Std. Error
95% Confidence Interval
Lower Bound Upper Bound
No practice No noice 13.800 .712 12.331 15.269
Low noice 12.600 .712 11.131 14.069
High noice 11.400 .712 9.931 12.869
Practice No noice 18.000 .712 16.531 19.469
Low noice 16.800 .712 15.331 18.269
High noice 12.200 .712 10.731 13.669
Profile Plots