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?
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.
... the calculation of test statistic for a independent sample t test . ... 78 Pooled Variance 1.020288 Difference in Sample Means 1.09 t Test Statistic 1.457532. ...
... That is, we are testing. ... Develop the null and the alternative hypothesis. The null hypothesis tested is. ... Use the SPSS to calculate an independent-samples t test. ...
... Perform two t-tests to determine if there is a difference in ... by step method for the calculation of testing of hypothesis using independent sample t test. ...
... is the dependent variable and X is the independent variable, a ... Freedom 6 Pooled Variance 9.25 Difference in Sample Means -7 t Test Statistic -3.254933885. ...
... check the bias by testing whether the sample mean ... significant and hence we should use Independent sample t-test assuming unequal. ... The null hypothesis tested is. ...
...sample t-test is used for testing, when measurements are ... On the other hand, an independent sample t-test is used ... damage for an automobile was tested before and ...
... The null hypothesis tested is. ... f. Decide which statistical test is appropriate and compute the test statistic (independent samples t-test or dependent ...
... by one another; highly skewed Question 19 of 25 The effect size for the t test for independent means is the difference between the sample means divided ...
... hypothesis testing with with different sample sizes. ... between monthly salary and three independent variables: length ... Coefficients Standard Error t Stat P-Value ...
