An Ohio university wishes to demonstrate that car ownership is detrimental to academic achievement. A random sample of 100 students who do not own cars had a mean GPA of 2.68 with a standard deviation of 0.6, while the same size of sample who own cars had a mean GPA of 2.55 with a standard deviation of 0.7. Can the university justify that the mean GPA for non-car owners is greater than the mean GPA for car owners at a 99% confidence?
Solution Summary
Step by step method for testing the hypothesis under 5 step approach is discussed here. Excel template for each problem is also included. This template can be used to obtain the answers of similar problems.
... of 9 non-smokers and a sample of 16 smokers is shown in Table 1. Using independent-samples t-test procedure in Excel ... Page 1 t-Test: Two-Sample Assuming ...
The answer to Hypothesis Testing: Independent sample t test. ... Use a two sample t-test to do the comparison at the .05 ... Answer The null hypothesis tested is. ...
... d. According to SPSS, the actual p value for the test statistic is .687 ... The following posting helps with various problems involving independent samples t-tests. ...
...Independent samples. ... The test statistic used is. (n1 − 1) S12 + (n2 − 1) S 2 2 X − X2 n1n2 t= 1 ~ tn1 + n1 − 2 Where S = S n1 + n2 n1 + n2 − 2. ...
Independent sample t test .. ... men Sample size 50 70 Mean spending 260 185 Sample variance 4500 ... the interval (-1.96, 1.96) D) Yes, because the test value 2.00 is ...
... Assume that independent samples show the following delivery time ... 83 Pooled Variance 16 Difference in Sample Means 31.5 t Test Statistic 36.23909572. ...
