In June, you bought 14.5 gallons of gasoline for $3.18 per gallon. The following February, you bought the same amount of gasolin
e for $1.88 per gallon. Select the expression(s) that you can use to find how much more you paid in June than in February. Then find this amount
14.5 (3.18 - 1.88)
14.5 x 1.88 - 14.5 x 3.18
14.5 x 3.18 - 14.5 x 1.88
14.5 x 1.88 +14.5 x 3.18
You paid $
more in June than in February???
The pooled variance method is used to estimate the variance of several different population with different means, but are assume to have the same variance.