1
00:00:00,000 --> 00:00:08,320
Before R.J. speaks with Dr. Sagnier, I think it's time for you to strengthen your muscles

2
00:00:08,320 --> 00:00:10,720
and increase your muscle stamina.

3
00:00:10,720 --> 00:00:15,720
The students at Oxon Hill Middle School will preview this program's hands-on activity,

4
00:00:15,720 --> 00:00:17,720
entitled Good Stress.

5
00:00:17,720 --> 00:00:18,720
Hi.

6
00:00:18,720 --> 00:00:22,640
NASA Connect asked us to show you this program's hands-on activity.

7
00:00:22,640 --> 00:00:28,920
In this activity, you will be exploring the effects of stress on the muscles in your hands.

8
00:00:28,920 --> 00:00:35,200
And you will gain experience collecting, analyzing, and visually representing data.

9
00:00:35,200 --> 00:00:39,920
You can download a copy of the Educator's Guide from the NASA Connect website.

10
00:00:39,920 --> 00:00:45,560
Before you begin the activity, it's a good idea to review how to make and interpret three

11
00:00:45,560 --> 00:00:47,580
types of plots.

12
00:00:47,580 --> 00:00:53,840
Scatter plots, box and whisker plots, and stem and leaf plots.

13
00:00:53,840 --> 00:00:57,120
Do you remember what a scatter plot is?

14
00:00:57,120 --> 00:01:02,720
A scatter plot is a graph that displays two variables as ordered pairs.

15
00:01:02,720 --> 00:01:07,960
You can use a scatter plot to determine how one variable relates to another.

16
00:01:07,960 --> 00:01:14,320
A box and whisker plot is a graph that summarizes a data set along a number line.

17
00:01:14,320 --> 00:01:19,600
There is a box in the middle and whiskers at either side.

18
00:01:19,600 --> 00:01:24,840
The least value of the data set determines the left whisker.

19
00:01:24,840 --> 00:01:29,520
The greatest value of the data set determines the right whisker.

20
00:01:29,520 --> 00:01:33,400
You form the box using quartiles.

21
00:01:33,400 --> 00:01:37,160
Quartiles divide the data into four equal parts.

22
00:01:37,160 --> 00:01:42,520
Box and whisker plots are useful with very large data sets or for making comparisons

23
00:01:42,520 --> 00:01:44,440
between data sets.

24
00:01:44,440 --> 00:01:50,240
A stem and leaf plot is a graph that uses the digits of each number to show the shape

25
00:01:50,240 --> 00:01:51,880
of the data.

26
00:01:51,920 --> 00:02:00,360
Each data value is broken into a stem, digit or digits on the left, and a leaf, digit or

27
00:02:00,360 --> 00:02:02,320
digits on the right.

28
00:02:02,320 --> 00:02:07,520
A key is needed to explain what your stems and leaves represent.

29
00:02:07,520 --> 00:02:13,160
A stem and leaf plot can quickly show the distribution of a data set and retains each

30
00:02:13,160 --> 00:02:14,720
data value.

31
00:02:14,720 --> 00:02:18,360
Your teacher can show you example problems using different plots.

32
00:02:18,360 --> 00:02:21,320
Now, are you ready to put your math skills to the test?

33
00:02:21,760 --> 00:02:22,760
Good.

34
00:02:22,760 --> 00:02:23,760
Now back to the activity.

35
00:02:23,760 --> 00:02:29,520
Working in groups of two, predict the number of times you will be able to click a clothes

36
00:02:29,520 --> 00:02:36,640
pin between your thumb and index finger in your non-dominant hand for a one minute period.

37
00:02:36,640 --> 00:02:39,040
Record your prediction.

38
00:02:39,040 --> 00:02:44,560
Hold the clothes pin in your non-dominant hand between your thumb and index finger.

39
00:02:44,560 --> 00:02:48,720
While your partner is watching the timer, count the number of times you are able to

40
00:02:48,720 --> 00:02:51,960
click the clothes pin in a one minute period.

41
00:02:51,960 --> 00:02:53,600
Record the result.

42
00:02:53,600 --> 00:02:59,120
Rest for one minute, then predict again and repeat clicking the clothes pin in a one minute

43
00:02:59,120 --> 00:03:00,400
period.

44
00:03:00,400 --> 00:03:03,280
You need to complete three trials.

45
00:03:03,280 --> 00:03:07,920
Be sure to hold the clothes pin the same way during every time trial.

46
00:03:07,920 --> 00:03:13,960
Now, switch roles with your partner and have him or her conduct the exact same experiment

47
00:03:13,960 --> 00:03:16,040
and record the results.

48
00:03:16,040 --> 00:03:22,320
Each group will need to repeat the experiment every other day for two weeks.

49
00:03:22,320 --> 00:03:24,680
Record your predictions and results.

50
00:03:24,680 --> 00:03:26,920
This is the conditioning period.

51
00:03:26,920 --> 00:03:32,160
The stress induced by the clothes pin on the muscles of the hand will cause the muscles

52
00:03:32,160 --> 00:03:35,480
to become stronger and gain stamina.

53
00:03:35,480 --> 00:03:40,220
Make sure you record all your data in a clear and organized way.

54
00:03:40,220 --> 00:03:45,800
This will help you to answer all the discussion questions and to produce visual representations

55
00:03:45,800 --> 00:03:46,800
of the data.

56
00:03:46,800 --> 00:03:49,880
And don't forget to check out the web activity for this program.

57
00:03:49,880 --> 00:03:52,480
It can be downloaded from the NASA Connect website.