Mrs. Najjar is comparing the means of her two Chemistry class on their unit 1 postttest. Her null hypothesis is that there is no difference between the scores for the two classes. The difference in the sample means is 40 points with a standard deviation of the difference of the sample mean of 15 points. What is the 68% confidence interval – how much would you add or subject from the mean AND find the actual interval?

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step-by-step explanation:

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

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step-by-step explanation:

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