A standardized test is given to a sixth grade class. Historically the mean score has been 126126 with a variance of 1212. The superintendent believes that the variance of performance may have recently decreased. She randomly sampled 2323 students and found a mean of 116116 with a standard deviation of 2.06772.0677. Is there evidence that the standard deviation has decreased at the α=0.05α=0.05 level?

answer: sorry i can't you.

step-by-step explanation:

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b

14

step-by-step explanation: