To find confidence interval on calculator press STAT key and use option A:1- PropZInt under TESTS

Many types of error will cause a computer program to terminate or give incorrect results. One type of error is punctuation. For instance, if a comma is inserted in the wrong place, the program might not run. A study of programs written by students in an introductory programming course showed that 75 out of 300 errors selected at random were punctuation errors. (a) Find a 99% confidence interval for the proportion of errors made by beginning programming students that are punctuation errors. Interpret the results in a clear sentence. (b) Find a 95% confidence interval. Is this interval longer or shorter? (c) Find the margin of error for each confidence interval. (Hint: you do have enough information from the calculator output!) (d) Compare the margin of error from part (b) with the quick method we learned early in the semester. Is it the same? Why or why not