Solve the following problems:

1. Find the sample size of 2000 with the margin of error of 5%, using Sloven's formula.

2 Find the sample size of 1200 with the margin of error of 1%, using Sloven's formula.

3. We know from experience that intensive coaching increases reading skill. Therefore if a class has been coached, or hypothesis is that it will gain in reading comprehension. At the end of the school year, a sample class of 25 which had received special coaching average 85 with standard deviation of which is 5 points higher on a reading test than the other classes in general in general which had received no coaching with level of significance of 5%

a. Create a Null Hypothesis and Alternative Hypothesis.

b. Solve using T-test

c What is the critical value?

d Draw a conclusion.