Question

A video game player insists that the longer he plays a certain computer game, the higher his scores are. The table shows the total number of minutes played and the high score (in thousands of points) achieved after each 5-minute interval. Use α = .01 .

# Min   5   10    15   20    25    30    35    40    45   50   55   60
Score  48.0 53.3 101.9 72.5 121.5 146.0 196.1 118.5 150.5 80.7 36.0 64.8

What game score do you predict after 47 minutes of play? (Round to the nearest hundredth.)

Answer 1

	Min (x)	Score (y)	x^2	xy
	5	48	25	240
	10	53.3	100	533
	15	101.9	225	1528.5
	20	72.5	400	1450
	25	121.5	625	3037.5
	30	146	900	4380
	35	196.1	1225	6863.5
	40	118.5	1600	4740
	45	150.5	2025	6772.5
	50	80.7	2500	4035
	55	36	3025	1980
	60	64.8	3600	3888
Total	390	1189.8	16250	39448