Question(d), the free response one please. Thanks 2. Prep Course. SAT like that

Question

Question(d), the free response one please. Thanks

2. Prep Course. SAT like that taking their course, you can increase prep courses to market by really your SAT Some statisticians were curious how effective these courses ore. were. They decided to investigate the truth of the claim. (a) Identify u in this scenario. (Choose one) Average increase in score by all people in the sample. ue increase in score of all people in the population. average True average score of all people in the population. Average score of all people in the sample.

Explanation / Answer

1) No, we can not make inferences about the score of a specific individual. As these statistical tests are based on means. So we are talking about the averages here.

2) When sample size is very large, then SE is very small. As n increases, SE decreases, which means t value will increase, and as the t value increases, the p-value will decrease. So even a small observed difference may be statistically significant. And Small sample size can increase the probability of type 2 error, not type 1. And Large sample sizes can increase the probability of type 1 error.

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