Students were given a pre-test. Then after they listened to a certain type of music they were given a similar post test. If we define the difference as the post test score minus the pre test score and we find a 95% confidence interval for the mean of the differences to be [-1.34, 4.56]. Which of the following is true?

a. It seems like music has affected the scores and the post test scores are significantly higher.
b. It seems like music has affected the scores and the post test scores are significantly lower.
c. There seems to be insufficient evidence to show that music affected the scores since zero is in the confidence interval.
d. The average scores in the post test were on average about 4.56 points higher than the pre-test.

the line of

“a term can be a signed number, a variable, or a constant multiplied by a + sign or j sign. in , the terms are 5x , 3y and 8. when a term is made up of a constant multiplied by a variable or variables, that constant is called a coefficient.” i hope this you.

hello,

as we don't know if g(x) is continue,

answer b

f(x)=2x²-8x+1=2(x²-4x+4)+1-8=2(x-2)²-7

vertex is (2,-7) ( a minimum since coefficient of x² is > 0)

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