Reference no: EM131703

Problem 1

A researcher is interested in evaluating whether there is a relationship between number of packs of cigarettes smoked per day and longevity (in years). n=10.

# packs of cigarettes smoked (X)		Longevity (Y)
0		80
0		70
1		72
1		70
2		68
2		65
3		69
3		60
4		58
4		55

1. Evaluate the correlation coefficient.

2. Evaluate the coefficient of determination

3. Evaluate the regression coefficient b₁

4. Evaluate the regression coefficient b₀

5. The regression equation

6. Excel regression analysis

Problem 2:  A researcher is interested in determining whether there is a relationship between advertising and sales for her firm.

advertising in $thousands(X)	Sales in millions(Y)
1	0
1	1
2	4
4	5
5	5
6	7
6	8
6	7
7	8
10	11
11	12

Problem 3: 

A researcher is interested in determining whether there is a relationship between price and quantity demanded for her firm.

Price(X)	Q-demanded(Y)
2	95
3	90
4	80
5	78
6	72
7	69
8	71
9	70
10	60
11	50
12	44

Problem 4: 

A researcher is interested in determining whether there is a relationship between grades and hours studied for statistics.

Hours studied(X)	Grade on final(Y)
1	20
2	25
4	40
7	60
6	62
7	72
8	83
9	95