A teacher wants to compare scores on a geology exam for two classes. The difference between the sample means is 21.4. If the standard deviation of the distribution of the difference between sample means is 16.66, and she is testing the hypothesis at the 68% confidence level,
which statement is true?
ОА. The difference between the two means is significant, so the null hypothesis must be accepted.
OB. The difference between the two means is not significant, so the alternative hypothesis must be rejected.
OC. The difference between the two means is not significant, so the null hypothesis must be rejected.
OD The difference between the two means is not significant, so the alternative hypothesis must be accepted.
OE. The difference between the two means is significant, so the alternative hypothesis must be accepted.

step-by-step explanation:

always plug in x. in this case, x equals 4.

i'm going to first solve 4(2+3x)

1) 4(2+3(4)) use pemdas to solve.

i'm going to multiply whats in the parenthesis first, so 3 times 4=12.

2)4 (2+12) i'm then going to multiply 4 by both numbers in the parenthesis (because multiplying comes before adding)

4 times 2= 8.   4 times 12= 48

4) (8+48)= 56 (answer)

i'm then going to solve 8+12x and plug in 4 for x.

1) 8 +12(4)

multiplying comes before adding, so i'm gonna multiply 12 and 4.

12 times 4= 48.

2) 8+48=56

both equal the same!

take it another

5050

hope this !

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step-by-step explanation: