Solve the following problems with the corresponding formulas where they apply.

If the reliability level is 90%, the variable of interest represents 15% of the population and the accepted margin of error is 3%. Determine the sample size:

a. When the size of the population is unknown.

b. If the population size is 50 units.

Use MS Excel or OpenStat to make a scatter plot with the following data that seeks to relate the defective units of a drug with the milligrams of the active ingredient. You must attach the file in your answer.