T-Test
Notes
Output Created 07-JUN-2013 11:20:55
Comments
Input Data C:\Users\donn\Documents\GCU Lead fac\Project with Judy for modifying PSY845 to introduce SPSS\drinks database -revised for course applications DH.sav
Active Dataset DataSet1
File Label SPSS/PC+
Filter
Weight
Split File
N of Rows in Working Data File 35
Missing Value Handling Definition of Missing User defined missing values are treated as missing.
Cases Used Statistics for each analysis are based on the cases with no missing or out-of-range data for any variable in the analysis.
Syntax T-TEST GROUPS=Reducedcals(0 1)
/MISSING=ANALYSIS
/VARIABLES=price
/CRITERIA=CI(.95).
Resources Processor Time 00:00:00.02
Elapsed Time 00:00:00.01
[DataSet1] C:\Users\donn\Documents\GCU Lead fac\Project with Judy for modifying PSY845 to introduce SPSS\drinks database -revised for course applications DH.sav
Group Statistics
Regular or reduced calorie for brand N Mean Std. Deviation
Price per 6-pack for brand Regular 28 3.1154 1.24040
Reduced Calories 7 2.6757 .21870
Group Statistics
Regular or reduced calorie for brand Std. Error Mean
Price per 6-pack for brand Regular .23441
Reduced Calories .08266
Levene's Test for Equality of Variances
F Sig.
Price per 6-pack for brand Equal variances assumed 6.987 .012
Equal variances not assumed
Independent Samples Test
t-test for Equality of Means
df Sig. (2-tailed) Mean Difference t
Price per 6-pack for brand Equal variances assumed 33 .362 .43964 .924
Equal variances not assumed 31.912 .086 .43964 1.769
Independent Samples Test
t-test for Equality of Means
Std. Error Difference 95% Confidence Interval of the Difference
Lower Upper
Price per 6-pack for brand Equal variances assumed .47576 -.52829 1.40758
Equal variances not assumed .24856 -.06671 .94600
1.Is the F-value for Levene's Test for Equality of Variances significant (that is, is the p < .05)?
2. What is the exact significance level? Note: if the Levene's Test for Equality of Variances is significant, then equal variances cannot be assumed.
3. Which t-value should you use now that you know whether or not equal variances can be assumed? What is that t-value? What is the two-tailed significance level for that t-value? State the exact significance value. Report the results of the t-test as follows: t(df value) = ___, and p-value
4. Is there a statistically significant difference between the price per 6-pack of regular beers versus reduced calorie beers?