1. Press STAT and select the default Edit by pressing ENTER
2. Press up arrow (^).
You should see L1 = on the bottom of the screen. (If you see NAME=, then you should key in L1 (L1 is 2nd– 1, right above the number 1 button.).
3. Press MATH and select PRB and randBin(
‘ L1 = randBin( ’ should appear at the bottom of the screen.
4. Complete the entries to read L1 = randBin(25 , .60 , 100)/25. (This randomly finds the number of successes in 25 trials, when the probability of success is pi = .60, and repeats this 100 times. Then each entry is divided by the number of trials 25, to obtain the proportion of successes p. )
5. After you complete the entry in step 4, hit the ENTER button and wait a couple of minutes. You will see list L1 fill up with 100 simulated p’s.
6. To get the mean value of these p’s, hit STAT and select CALC and 1-Var Stats and ENTER. You will see descriptive statistics for the list L1, including the mean denoted by x-bar.
7. To compute the average value of the random sampling error for part (b) of the exercise, press STAT, select Edit, the hit up arrow (^) followed by right arrow (>). You will see ‘L2 =’ at the bottom of the screen. Enter L1 – .6. (Recall the L1 button is the second function for the number 1 button). You will see the 100 sampling errors in the list L2.
8. To get the average value of the random sampling errors, hit STAT, select CALC and
1-Var Stats, type in L2, and the hit ENTER.
9. Part (c) and (d) can be completed using the same techniques given above.