A University of Illinois study on aggressive behavior surveyed a random sample of 558 middle school students. When asked to describe their behavior in the last 30 days, 445 students said their behavior included physical aggression, social ridicule, teasing, name-calling, and issuing threats. This behavior was not defined as bullying in the questionnaire. Is this evidence that more than three-quarters of middle school students engage in bullying behavior?

Yes

Step-by-step explanation:

Bullying can be categorized as physical, verbal, social bullying, and cyber bullying.In the above listed behaviors, they fall under one or more of these categories of bullying.

445 students out of 558 , is 445/558 =0.7975 .Putting this as a percentage gives; 0.7975 *100= 79.57 which is more than 3/4 of the middle school students.

a 10 percent increase

answer: a

step-by-step explanation:

if xy ~ yz therefore xy would be the same length as yz