To test the effectiveness of a business school preparation course, 8 students took a general business test before and after the course. if we are testing at the 5% significance level to see whether the business school preparation course is effective in improving exam scores, our critical value is 1.895. we should reject the null if the test statistic is

We should reject the null if the test statistic is greater than 1.895.

Step-by-step explanation:

We assume the population to be normally distributed.

Given:  Sample size : , which is asmall sample (n<30), so we use t-test.

We always reject the null hypothesis if the absolute t-value is greater than critical value.

Therefore, We should reject the null if the test statistic is greater than 1.895.

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last graph i believe

step-by-step explanation:

worked it out i believe

answer: 140

step-by-step explanation:

so just add all then it will be your answer but i am not pretty sur eif it is but hope this i am here to people