Standardized measures seem to indicate that the average level of anxiety has increased over the past 50 years (Twenge, 2000). In the 1950s, the average score on the Child Manifest Anxiety Scale was u = 15.1. A sample of n = 16 of today’s children produces a mean score of M = 23.3 with SS = 240. (a) Based on the sample, has there been a significant change in the average level of anxiety since the 1950s? Use a two-tailed test with alpha = .01.

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

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

mia khalifa

step-by-step explanation: