Before you solve Problems 5–14, first classify the problem as one of the following:
Chi-square test of independence or homogeneity
Chi-square goodness of fit
Chi-square for testing or estimating σ2 or σ
F test for two variances
One-way ANOVA
Two-way ANOVA
Then, in each of the problems when a test is to be performed, do the following:
- (i) Give the value of the level of significance. State the null and alternate hypotheses.
- (ii) Find the sample test statistic.
- (iii) Find or estimate the P-value of the sample test statistic.
- (iv) Conclude the test.
- (v) Interpret the conclusion in the context of the application.
- (vi) In the case of one-way ANOVA, make a summary table.
Education: Exams Professor Fair believes that extra time does not improve grades on exams. He randomly divided a group of 300 students into two groups and gave them all the same test. One group had exactly 1 hour in which to finish the test, and the other group could stay as long as desired. The results are shown in the following table. Test at the 0.01 level of significance that time to complete a test and test results are independent.
Want to see the full answer?
Check out a sample textbook solutionChapter 10 Solutions
Understandable Statistics: Concepts and Methods
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill