Use the following data to compute a 98% upper confidence bound for μ1 − μ2: m = 41
x = 42,700
s1 = 2030
n = 41
y = 36,275
s2 = 1360.

Step-by-step explanation:

For this case we have the following info given:

And for this case we want a 98% confidence interval. The significance would be:

The degrees of freedom are:

And the critical value for this case is:

And the confidence interval would be given by:

And replacing we got:

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

step-by-step explanation: