1
00:00:02,070 --> 00:00:02,903
[Presenter] Hello, students.

2
00:00:02,903 --> 00:00:04,230
Today, in this short video,

3
00:00:04,230 --> 00:00:06,600
we will learn how to use a z-table.

4
00:00:06,600 --> 00:00:08,700
The z-table is from the back of our book,

5
00:00:08,700 --> 00:00:12,358
and this is the one that
we will use for our class.

6
00:00:12,358 --> 00:00:15,060
Z-values have three numbers,

7
00:00:15,060 --> 00:00:17,100
and two of them come from the column,

8
00:00:17,100 --> 00:00:19,500
and the third one comes from the row.

9
00:00:19,500 --> 00:00:22,830
So let's work with a simple z-value,

10
00:00:22,830 --> 00:00:25,920
and we will start with 1.00.

11
00:00:25,920 --> 00:00:30,890
So first we will go down the
column until we reach 1.0,

12
00:00:31,740 --> 00:00:33,570
and then we will go across,

13
00:00:33,570 --> 00:00:36,450
and, this time, the first entry

14
00:00:36,450 --> 00:00:38,250
is the number we are looking for.

15
00:00:38,250 --> 00:00:42,393
So it's going to be 0.8413.

16
00:00:44,700 --> 00:00:46,770
Now, let's look at another z-value,

17
00:00:46,770 --> 00:00:48,570
a more commonly used one,

18
00:00:48,570 --> 00:00:51,270
and that would be 1.96.

19
00:00:51,270 --> 00:00:54,370
So again, we are going
to go down this column

20
00:00:55,230 --> 00:00:57,840
until we reach 1.9,

21
00:00:57,840 --> 00:01:00,480
and then we are going to go across,

22
00:01:00,480 --> 00:01:04,860
and, basically, the
intersection provides us

23
00:01:04,860 --> 00:01:06,360
the number we are looking for,

24
00:01:06,360 --> 00:01:09,663
and that number here is 0.9750.

25
00:01:10,950 --> 00:01:14,010
I have highlighted both of these numbers

26
00:01:14,010 --> 00:01:16,800
with the yellow for your convenience.

27
00:01:16,800 --> 00:01:19,680
I hope this short video was helpful,

28
00:01:19,680 --> 00:01:21,240
and if you have any questions,

29
00:01:21,240 --> 00:01:23,523
please let know because I'm here to help.