2. Chi-square test contributing 2 marks of the final sam A professor wants to know if students who regularly attend lecture and read the extbook performs differently in her introductory statistics course than the talents who only sad the textbook. The results are as follows Grade Textbook caly Textbook and lecture A 11 20 B 18 19 C 23 22 D 21 17 16 F Based on the results, the professor would like to conduct a chi-square testing a level of significance of 0.05. 3) Hypothesis Ha There is H. There is (some/ho) association between grade and atending lecture or not (some no) association between grade and atiending lecture or not b) Sampling distribution: If the null hypothesis is true, the sampling distribution of chi-square statistics is approximately the chi-square distribution with ((row-1) (column-1) degrees of freedom Two-way table (observed counts) Grade Testbook only Textbook total and lecture A 11 20 B 18 19 C 23 22 D 21 17 F total 16 5. - Page 3 of 5 $ & 3 4 tinn 6 7 C 9 E R T Y U T 0 P D F G H 3 C V B