Discussion:
Q1: A teacher claims that a grammar seminar will help students reduce the number of grammatical errors they make when writing a 1000-word essay. The table shows the number of grammatical errors made by seven students before participating in the seminar and after participating in the seminar.
Student 1 2 3 4 5 6 7
Errors (before) 15 10 12 8 5 4 9
Errors (after) 11 9 6 5 1 0 9
Q2: Which two-sample test should you use for this situation?
Q3: Is there enough evidence to conclude that the seminar reduced the number of errors? Use a significance level of ±=0.05. You must state the hypotheses, determine the test statistic, and either the P-value(s) or critical value(s). Finally, you must clearly state your conclusion.