indicate whether the sample is a probability sample or a nonprobability and provide a brief description of the sampling method. stratified random sample

A researcher was interested in evaluating the effects of  frequency of social skills training (3 times a week vs. 5 times a week) on preschool children’s social skills.     What is the dependent variable in the above study?      

A researcher found that a high protein breakfast for children resulted in children being more alert in the classroom which resulted in higher academic achievement. What type of variable is children’s alertness in the classroom?

A student is using the addition (or elimination) method to solve a system of two linear equations. After combining the equations, the student arrives at the statement: Based on this result, which of the following statements must be true regarding the graphs of these two equations?

A client with known peptic ulcer disease suddenly reports severe abdominal pain, states “it feels like something ripped,” and is now lying still with shallow respirations. On assessment, the abdomen is rigid and boardlike. Which action is the priority?

A client with myasthenia gravis reports difficulty chewing during meals and “feeling weaker by dinnertime.” Which instruction is most appropriate?

The main pattern of organization of the passage is  

Sentences 4 and 5 state: 

Which statement best expresses the central point of the passage? 

In sentence 11, the word empathy means