With this date answer these questions please Group Statistics regular N Mean Std
ID: 3218557 • Letter: W
Question
With this date answer these questions please
Group Statistics
regular
N
Mean
Std. Deviation
Std. Error Mean
postlet
control
54
16.91
9.481
1.290
treatment
186
29.60
12.997
.953
Independent Samples Test
Levene's Test for Equality of Variances
t-test for Equality of Means
F
Sig.
t
df
Sig. (2-tailed)
Mean Difference
Std. Error Difference
95% Confidence Interval of the Difference
Lower
Upper
postlet
Equal variances assumed
32.696
.000
-6.673
238
.000
-12.689
1.902
-16.435
-8.943
Equal variances not assumed
-7.911
116.658
.000
-12.689
1.604
-15.866
-9.513
1.State the null and alternative hypothesis and state the critical t* value ( = .05; two-tail test).
2.According to Levene’s test for Equality of Variances – can you assume the treatment vs. control group have equal variances for the postlet scores? Explain why or why not. Discuss which row you should look at for the correct test statistics in the output.
3.Write an APA style conclusion including the t-statistic, df, and 95% confidence interval. This is for psychology statistics course.
Group Statistics
regular
N
Mean
Std. Deviation
Std. Error Mean
postlet
control
54
16.91
9.481
1.290
treatment
186
29.60
12.997
.953
Explanation / Answer
a) H0 : The control and treatment groups variances are equal
H1: The control and treatment groups variances are not equal
b)
P-value = 0.000 which is less than alpha 0.05, we reject H0
Thus, we conclude that the treatment vs. control group have not equal variances for the postlet scores
3. t-statistic = -6.673 for assumed equal varaince and df = 238
= -7.911for assumed unequal variances and df = 116.658
The 95% confidence that the difference between the two population variances (Control and treatment groups) is lies between -16.435 and -8.943.
i.e. the 95% chance that the difference between the two population variances (Control and treatment groups) will be lies between -16.435 and -8.943.
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