To nd a condence interval for a proportion, press the STAT key and use option Azl-Prolent under TESTS. Notice that the normal distribution will be used. EDIT CHLC STI'PPDPZ as m 6 2-Pr0P2Testm ZInterualm TInterualm 2-SENPZIHtm 2-SamPTIhtm :Bl-PPDPZIntm ? 3 9 B The letterx is used to count the number of successes. Enter 123 for x and 300 for 11. Use 0.95 for the Gm Highlight Calculate and press ENTER. Your Turn: 2. 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% condence 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% condence interval. Is this interval longer or shorter? (c) Find the margin of error for each condence interval. (Hint: you do have enough information