The U. S. Energy Information Administration surveys households to obtain data on residential energy consumption and expenditures and find out the mean residential energy expenditure of all U. S. families in 1995 was $1,123. That same year, 15 randomly selected upper-income families reported their energy expenditures. Their mean energy expenditures was $1,344.27 and the standard deviation was $231.
At the 5% significance level, do the data indicate that in 1995, upper-income families spent more on the average, for energy than the national average of $1,123?

the anwser is d) 75°

step-by-step explanation:

0.0076, if you meant 4.125 divided by 0.03125 it would be 132

step-by-step explanation:

first you have to move the decimal in 0.03125 over until its behind the 5 which is 5 places over. now the number is 3125

then you have to move the decimal in 4.125, 5 places over. now the number is 4,112,500.

now you divide like you would normally would and get 0.0076

hence, the required result is

step-by-step explanation:

suppose we have two matrices a and b

we will assume the two matrices

we have to compute b-a which means subtracting corresponding elements of a from b.

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