1) Using the sample calculate a 95% two-sided confidence interval for the following.

A. Mean of TOTAL Score

B. Mean of INCOME

C. Proportion of "HIGH" performers among Male learners

D. Proportion of "HIGH" performers among Female Learners.

2) If we want to estimate a 95% confidence interval for the population mean of "TOTAL" marks within 5 marks, what is the sample size required? Please note that you do not know . You may use your present sample of 1000 as a pilot sample.

3) If we want to estimate a 95% confidence interval for the proportion of "HIGH" performers within 0.05, what is the appropriate sample size?

Please suggest how should I share excel data file?