Select the correct answer.Mateo teaches a continuing education class at the library on Tuesday nights. He estimates that 75% of his students are satisfied or very satisfied with the class.Last week, he asked a random sample of students to take a survey on their experience in the class. However, the results showed that only 70% indicated that they are satisfied or very satisfied with the class. He decides to randomly survey more of his students. How will Mateo know whether his model is valid or not? A. It is valid if the result from all the surveys and the model stay the same. B. It is valid if the result from all the surveys and the model get farther apart. C. It is valid if the result from all the surveys and the model get closer together. D. It is impossible to determine whether the model is valid.

Mariam and Mateo are performing an experiment involving electric circuits. They are discussing what it means for an experiment to be valid. Mariam states that for an experiment to be valid, it needs to measure what it intends to measure. Mateo believes that it needs to be performed using a valid report template. Evaluate the two students’ claims and list the stages of experimentation which affect validity.

Which of the following scenarios is LEAST likely to produce valid data from which to draw an inference?Report an ErrorA set of field interview notes telling about people's experiencesA generalizable sample size of survey participantsA well designed study following the scientific methodA data set of statistics produced by a special interest group

Think of all employees at a company as a population of interest. All employees are emailed a link to a survey and it up to them whether they choose to respond. We can consider the employees that respond to the survey a random sample. True or false? Question 9Select one:TrueFalse

A researcher asks 250 students (from a school with 1000 pupils) to complete a survey about the cafereria. The 250 students are a:a. populationb. case studyc. sampled. variable

Which research design has the highest population validity for a study whose population of interest is students enrolled at a certain university?1 分Visit the campus recreation center and ask every other person who passes to participate.Ask the registrar for a list of all the students enrolled at the university and randomly select participants.Stand outside the university’s career center and recruit participants as they enter the building.Visit each dorm and recruit a certain number of students from each floor.