Discuss the below:
Q1. Why do you use N-1 rather than just N when calculating the standard deviation as estimated from a sample? How does the t-statistic differ from the z-statistic? When would you use a single-sample t-test?
Q2. What is an independent-sample test? How does it differ from a single-sample t-test and a paired-sample test?Why do you need to calculate the pooled variance in an independent-sample t-test?
Q3. Why do you need to calculate the pooled variance in an independent-samples t-test?