Write a function that takes a list as a parameter, converts every element in the list to integar and then returns a tuple comprising of these integar elements. If the function encounters a character such as 'p' that cannot be converted to an integar, it throws this error message on the screen: "Error. Please enter only integers."

Asample of 200 rom computer chips was selected on each of 30 consecutive days, and the number of nonconforming chips on each day was as follows: 8, 19, 27, 17, 38, 18, 4, 27, 9, 22, 30, 17, 14, 23, 15, 14, 12, 20, 13, 18, 14, 20, 9, 27, 30, 13, 10, 19, 12, 26. construct a p chart and examine it for any out-of-control points. (round your answers to four decimal places.)