Wks 01
_____________,_______________
Surname(e.g. Straayer),
Given Name(e.g. Dave)
In this worksheet we are going to learn how to do an S.R.S. First, we need to “serial number” everyone in the
classroom. Get names from everyone in class and fill in the table below.
#
Name like "Jim S." #
Name like "Jim S." #
Name like "Jim S." #
Name like "Jim S."
1
9
17
25
2
10
18
26
3
11
19
27
4
12
20
28
5
13
21
29
6
14
22
30
7
15
23
31
8
16
24
32
Now we are going to select a sample of 5 students as an S.R.S. Use your calculator’s random number generator to
pick 5 students. MATH/PROB/randInt( with three arguments, separated by commas. The first is the lower limit (1,
because the lowest number above is 1). The second number will be the
number of students in class today, probably around 30 or so. The third
number will be “n”, the sample size of 5. It should look like the top picture on the right ,
but you may see a “form fill-out” if you have a newer calculator that looks like the
second picture at the right. If you have the “form fill-out”, when you select Paste and
press enter, you’ll see a line like the top one. Press ENTER to get 5 random numbers. What to do if the same student
was selected more than once? Just do the randInt again (just press ENTER to repeat) and take the first one or more
until you have 5 different students. Record them below:
____________, ___________, ___________, ___________, __________
Check around with your fellow students. Do you all have the same 5 numbers? Y / N (circle)
Now, “seed the random number generator”. We’ll roll the “digit dice” at the front of the room and record the digits
in the order: Blue, Green, Burgundy, Yellow to get this 4-digit number: _____________
Enter the 4 digits followed by the “STO>” key, followed by MATH/PROB/rand. It should look like:
, except that the digits probably won’t be “1234”. Repeat the randInt command by pressing
2 /ENTRY until it appears. Now record the results:
nd
____________, ___________, ___________, ___________, __________
Check around with your fellow students. Do you all have the same 5 numbers? Y / N (circle)