I am stuck on this.

A psychology professor wants to know whether age is related to memory quality in current first-year students at his small college. Participants in the study (first-year students at his college) complete an online memory task. The students are first shown a list of 60 words. Next they are shown a list that includes 10 words that were on the original list. Then they are asked to identify the words on the second list that appeared on the original list. He uses the percentage of words that were correctly recognized on the original list as his measure of memory quality. He also asks the students to report several characteristics such as their age, gender, and verbal SAT score.

Each of the 750 first-year students (338 males and 412 females) at his school volunteered to participate. The professor chose 75 students at random to complete the memory task and answer the questions. The average percentage of words that were correctly recognized on the original list was 68%. The professor infers that if all 750 first-year students had completed the study, the results would show that an average of 68% (plus or minus sampling error) of the words were correctly recognized as being on the original list.

Which of the following arevariablesin the study?

The students' ages

The students' percentage of words that were correctly recognized on the original list

The 75 students

The 750 students

What is thepopulationin the study?

The 75 students who participated in the study

The 750 first-year students at the college

The 68% of words correctly recognized as being on the original list

What is thesamplein the study?

The 750 student volunteers

The 75 students who participated in the study

The 68% of words correctly recognized as being on the original list

What is an example of astatisticin the study?

412 females and 338 males

68%, the average percentage of words that were correctly recognized as being from the original list by the 75 students

68%, the average percentage of the original list expected to be correctly recognized by the 750 students

What is an example of aparameterin the study?

The actual average percentage of words that would be correctly recognized as being from the original list by the 750 first-year students

75 students

68% of words that were correctly recognized on the original list by the 75 first-year students

What is an example of the professor usingdescriptive statistics?

He randomly chooses the 75 students to represent the 750 volunteers.

He characterizes the first-year students at the college as consisting of 338 males and 412 females.

He infers that if all 750 students had done the experiment, the results would show that an average of 68% (plus or minus sampling error) of the words were correctly recognized as being on the original list.

What is an example of the professor usinginferential statistics?

He reports that the average percentage of words that were correctly recognized on the original list was 68%.

He characterizes the first-year students at the college as consisting of 338 males and 412 females.

He infers that if all 750 students had done the experiment, the results would show that an average of 68% (plus or minus sampling error) of the words were correctly recognized as being on the original list.