#### Linear Regression #2

```THE DATA ARE THE PERCENTAGE EXAMINATION MARKS (Y) AND TH
PERCENTAGE
ATTENDANCE AT CLASSES (X) FOR A GROUP OF 40 STUDENTS,

PERFORM A LINEAR REGRESSION OF Y ON X AND USE THIS TO DETERMINE TH
FOLLOWING
AMOUNTS.

INTERCEPT (a)				12.60463992
PREDICTED VALUE OF Y WHEN X = 60%
PREDICTED VALUE OF Y WHEN X = 0%
CORRELATION COEFFICIENT				0.81440364
COEFFICIENT OF DETERMINATION
ESTIMATED ATTENDANCE WHEN MARK =  50%

MARK %	ATTENDANCE %	WORKING AREA IF NEEDED
45	48
55	40
65	90
89	90
100	100
20	5
35	15
25	10
45	50
55	45
69	80
75	70
86	80
79	85
25	12
10	89
0	2
56	70
68	80
78	80
50	60
45	55
90	85
100	95
95	80
75	90
40	85
20	10
25	15
30	20
0	10
50	60
40	67
57	89
68	78
58	60
30	20
21	12
25	25
78	9

--
stura
-----------------------------------------------------------------------
sturae's Profile: http://www.excelforum.com/member.php?action=getinfo&userid=2998

```
 0
1/10/2006 4:24:25 PM
excel 39879 articles. 2 followers.

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```Look in HELP for the following functions:

LINEST
TREND
FORECAST

and also look at some of the other statistical functions.

That should provide all the information you need for your assignment.

On Tue, 10 Jan 2006 10:24:25 -0600, sturae
<sturae.21ffzn_1136910301.2812@excelforum-nospam.com> wrote:

>
>THE DATA ARE THE PERCENTAGE EXAMINATION MARKS (Y) AND THE
>PERCENTAGE
>ATTENDANCE AT CLASSES (X) FOR A GROUP OF 40 STUDENTS,
>
>PERFORM A LINEAR REGRESSION OF Y ON X AND USE THIS TO DETERMINE THE
>FOLLOWING
>AMOUNTS.
>
>INTERCEPT (a)				12.60463992
>PREDICTED VALUE OF Y WHEN X = 60%
>PREDICTED VALUE OF Y WHEN X = 0%
>CORRELATION COEFFICIENT				0.81440364
>COEFFICIENT OF DETERMINATION
>ESTIMATED ATTENDANCE WHEN MARK =  50%
>
>MARK %	ATTENDANCE %	WORKING AREA IF NEEDED
>45	48
>55	40
>65	90
>89	90
>100	100
>20	5
>35	15
>25	10
>45	50
>55	45
>69	80
>75	70
>86	80
>79	85
>25	12
>10	89
>0	2
>56	70
>68	80
>78	80
>50	60
>45	55
>90	85
>100	95
>95	80
>75	90
>40	85
>20	10
>25	15
>30	20
>0	10
>50	60
>40	67
>57	89
>68	78
>58	60
>30	20
>21	12
>25	25
>78	90

--ron
```
 0
ronrosenfeld (3122)
1/10/2006 5:26:26 PM

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