3) 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?

69.64%

step-by-step explanation:

total of apples - take away four

6-4 = 2

answer is 2 apples

1^3 + 2^3 + 3^3 +4^3 = (1+2+3+4)^2

step-by-step explanation:

i am only able to answer the first part. i am not sure about the second part. sorry

a.for lorena 14 hours makes $126   for 16 hours she makes 144

for julie 6 hours makes $72 for 21 hours its $252

b. julie makes more money than lorena julie makes $12 an hour and lorena makes $9  

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