Aproposed null hypothesis states that there is no difference between the mean weights of the population of two neighboring districts. the sample mean difference is 12 kilograms, and the standard deviation of the distribution of the difference between sample means is 9 kilograms. which statement is true?
a. the null hypothesis must be accepted if we choose the 68% confidence level.
b. the null hypothesis must be accepted if we choose the 95% confidence level.
c. the null hypothesis must be rejected if we choose the 99.7 % confidence level.
d. the null hypothesis must be rejected if we choose the 100% confidence level.
e. the null hypothesis must be rejected if we choose the 95% confidence level.

answer: i don't understand it

step-by-step explanation: sorry

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.