A study by Ruback & Juieng (1997) included information on the gender of drivers and the number of passengers each driver had in the car. Using this dataset, a t-test was conducted to compare the number of passengers across male and female drivers and the results (from SAS) are shown below. (a) Compute and interpret the effect size for the difference (between genders) in the number of nogg on

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A study by Ruback & Juieng (1997) included information on the gender of drivers and the number of
passengers each driver had in the car. Using this dataset, a t-test was conducted to compare the number
of passengers across male and female drivers and the results (from SAS) are shown below.
(a) Compute and interpret the effect size for the difference (between genders) in the number of
passengers.
(b) Fully interpret the results of the t-test, assuming homogeneity of variance.
Transcribed Image Text:A study by Ruback & Juieng (1997) included information on the gender of drivers and the number of passengers each driver had in the car. Using this dataset, a t-test was conducted to compare the number of passengers across male and female drivers and the results (from SAS) are shown below. (a) Compute and interpret the effect size for the difference (between genders) in the number of passengers. (b) Fully interpret the results of the t-test, assuming homogeneity of variance.
The TTEST Procedure
Variable:
passgrs
gender
N
Mean
Std Dev
Std Err
Minimum
Маximum
female
103
0.6796
0.8309
0.0819
3.0000
male
97
1.1031
1.0654
0.1082
7.0000
Diff (1-2)
-0.4235
0.9519
0.1347
gender
Method
Mean
95% CL Mean
Std Dev
95% CL Std Dev
female
0.6796
0.5172
0.8420
0.8309
0.7309
0.9630
male
1.1031
0.8884
1.3178
1.0654
0.9337
1.2408
Diff (1-2)
Diff (1-2)
Рooled
-0.4235
-0.6891
-0.1579
0.9519
0.8666
1.0558
Satterthwaite
-0.4235
-0.6912
-0.1558
Method
Variances
DF
t Value
Pr > |t|
Pooled
Equal
198
-3.14
0.0019
Satterthwaite
Unequal
181.45
-3.12
0.0021
Transcribed Image Text:The TTEST Procedure Variable: passgrs gender N Mean Std Dev Std Err Minimum Маximum female 103 0.6796 0.8309 0.0819 3.0000 male 97 1.1031 1.0654 0.1082 7.0000 Diff (1-2) -0.4235 0.9519 0.1347 gender Method Mean 95% CL Mean Std Dev 95% CL Std Dev female 0.6796 0.5172 0.8420 0.8309 0.7309 0.9630 male 1.1031 0.8884 1.3178 1.0654 0.9337 1.2408 Diff (1-2) Diff (1-2) Рooled -0.4235 -0.6891 -0.1579 0.9519 0.8666 1.0558 Satterthwaite -0.4235 -0.6912 -0.1558 Method Variances DF t Value Pr > |t| Pooled Equal 198 -3.14 0.0019 Satterthwaite Unequal 181.45 -3.12 0.0021
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