A psychology professor wants to know whether confidence in memory skills 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 five new words that are conceptually similar to words 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 new but conceptually similar words that were mistakenly thought to be on the original list as his measure of memory quality. He also asks the students to report several characteristics such as their age, their gender, and a self-assessment of their memory skills.Each of the 1,000 first-year students (543 males and 457 females) at his school volunteered to participate. The professor chose 100 students at random to complete the memory task and answer the questions. The average percentage of new but conceptually similar words that were mistakenly thought to be on the original list was 34%. The professor infers that if all 1,000 first-year students had completed the study, the results would show that an average of 34% (plus or minus sampling error) of new words were mistakenly identified as original words because they were conceptually similar.

Which of the following are variablesin the study?Check all that apply.

a. The students' self-assessment of their memory skills

b. The 1,000 students

c. The 100 students

d. The students' percentage of new but conceptually similar words that were mistakenly thought to be on the original list

What is the populationin the study?

a. The 1,000 first-year students at the college

b. The 100 students who participated in the study

c. The 34% of new words mistakenly identified as original words because they were conceptually similar

What is the samplein the study?

a. The 34% of new words mistakenly identified as original words because they were conceptually similar

b. The 100 students who participated in the study

c. The 1,000 student volunteers

What is an example of a statisticin the study?

a. 34%, the average percentage of the conceptually similar words expected to be mistaken as being on the original list by the 1,000 students

b. 457 females and 543 males

c. 34%, the average percentage of conceptually similar words mistakenly thought to be on the original list by the 100 students

What is an example of a parameterin the study?

a. 100 students

b. The actual average percentage of conceptually similar words that would be mistakenly recognized as being from the original list by the 1,000 first-year students

c. 34% of new but conceptually similar words that were mistakenly thought to be on the original list by the 100 first-year students

What is an example of the professor using descriptive statistics?

a. He infers that if all 1,000 students had done the experiment, the results would show that an average of 34% (plus or minus sampling error) of new words were mistakenly identified as original words because they were conceptually similar.

b. He randomly chooses the 100 students to represent the 1,000 volunteers.

c. He reports that the average percentage of new but conceptually similar words that were mistakenly thought to be on the original list was 34%.

What is an example of the professor using inferential statistics?

a. He infers that if all 1,000 students had done the experiment, the results would show that an average of 34% (plus or minus sampling error) of new words were mistakenly identified as original words because they were conceptually similar.

b. He characterizes the first-year students at the college as consisting of 543 males and 457 females.

c. He reports that the average percentage of new but conceptually similar words that were mistakenly thought to be on the original list was 34%.