A statistics instructor wants to know if an expensive computer program will help

Question

A statistics instructor wants to know if an expensive computer program will help his students learn. He tries the program on a section of 35 students one semester and finds a P-value of 0.078 when comparing the class' average grade to that of the semester before. The vendor, still confident about the program's potential success, lets him try it again. That time, the P-value for the test was 0.006 with a class of 150 students, indicating the students did better on average, with the program. What's the difference? 1. The second class had more students — a larger sample size.2. There were probably some outliers that affected the analysis. 3. The second class was smarter.

Explanation / Answer

as econd class has larger sample size; which will give lower value of std error and if mean differnece is same will give lower p value

hence  1. The second class had more students — a larger sample size.

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