class 1 Flashcards
A psychologist wants to study a small population of 40 students in a local private school. If the
researcher was interested in selecting the entire population of students for this study, then how
many students must the psychologist include?
a. None, since it is not possible to study an entire population in this case.
b. At least half, since this would constitute the majority of the population.
c. All 40 students, since all students constitute the population.
d. No matter how many, the important is that they represent a random sample.
c
True or false. On occasion, a sample can be larger than the population from which it was selected.
false
Inferential statistics are used:
a. To describe whether a sample has more females or males.
b. To make predictions about populations by using sample data.
c. When we can’t use statistical software to analyse data.
d. To predict the sample data we will get when we know the population.
b
4) Procedures that allow researchers to infer or generalize observations made with samples to the
larger population from which they were selected best describes ______.
a. inferential statistics
b. sample statistics
c. descriptive statistics
d. population statistics
a
Descriptive statistics are procedures used to ______.
a. summarize a set of scores or observations
b. organize a set of scores or observations
c. make sense of a set of scores or observations
d. all the above answers are correct
d
Which of the following describes a descriptive statistic?
a. summarize
b. infer
c. generalize
d. predict
a
Suppose that a researcher is interested in a group of 10 million people who paid to see a movie
playing in theatres. In this example, the 10 million moviegoers would be regarded as ______.
a. a sample of moviegoers who paid to see the movie in a theatre
b. a population of moviegoers who paid to see the movie in a theatre
b
Researchers measure data in a ______ to learn more about individuals in the larger ______ of
interest.
a. sample; population
b. statistic; inference
c. population; sample
d. inference; statistic
a
Researchers rarely have access to entire populations. How do researchers resolve this limitation?
a. They do not need to resolve this; it is not a limitation at all.
b. They record data from an entire population of people to make inferences concerning
characteristics in a sample.
c. They record data from as many persons in a population as possible to draw conclusions concerning only those individuals.
d. They record data from a sample of people in the larger population in order to make inferences concerning characteristics in that larger population.
d
A researcher records the time it takes to complete a memory task in a sample of 25 participants.
He finds that the average participant completed the test in 43 s. The average time to complete this
task is called a ______.
a. population parameter
b. sample statistic
c. inferential statistic
d. time trial
b
A researcher identifies college students as a group of interest to test her hypothesis. She then
identifies a few local college students and selects a small group of the local college students to be
observed. In this example, the sample is ______.
a. not clearly identified
b. all college students
c. the few local college students
d. the small group of college students who here observed
d
True or false. Descriptive statistics are typically presented graphically, in tables, or as summary
statistics.
true
True or false. Descriptive statistics is a branch of mathematics used to make inferences about
populations’ given samples of data.
false
True or false. Two branches of statistics are independent and dependent statistics.
false
True or false. Descriptive statistics and inferential statistics are used for precisely the same
purposes.
false
