Chapter 1 quiz STATS

A recent study reports that students who just finished playing a prosocial video game were more likely to help others than students who had played a neutral or antisocial game. For this study, what is the independent variable?

The kind of game given to the student

You are instructed to subtract 4 points from each score, square the resulting value, and find the sum of the squared numbers. How would this set of instructions be expressed in summation notation?

Σ(X - 4)^2

A doctor is measuring children's heights to the nearest ½ inch and obtains scores such as 40.0, 40.5, 41.0, and so on. What are the real limits for a score of X = 42?

41.75 and 42.25

What is the value of (ΣX)^2 for the scores 1, 0, 2, 4?

49

What is the value of (ΣX)^2 for the scores 1, 5, 2?

64

A researcher uses an anonymous survey to investigate the television-viewing habits of American adolescents. Based on the set of 356 surveys that were completed and returned, the researcher finds that these students spend an average of 3.1 hours each day watching television. For this study, the set of 356 students who returned surveys is an example of a _______.

Sample

A researcher conducts an experiment to determine whether moderate doses of St. Johns Wort have any effect of memory for college students. For this study, what is the independent variable?

The amount of St. Johns Wort given to each participant

Students in an introductory art class are classified as art majors and non-art majors. What scale of measurement is being used to classify the students?

nominal

The participants in a research study are classified as high, medium, or low in self-esteem. What measurement scale is being used to classify self-esteem?

ordinal

Using letter grades (A, B, C, D, and E) to classify student performance on an exam is an example of measurement on a(n) _______ scale of measurement.

ordinal, it is ranking them

A researcher uses an anonymous survey to investigate the television-viewing habits of American adolescents. The entire group of American adolescents is an example of a _________.

population

What kind of measurement scale is necessary to conclude that one score is twice a big as another?

ratio

The average verbal SAT score for the entire class of entering freshmen is 530. However, if you select a sample of 20 freshmen and compute their average verbal SAT score you probably will not get exactly 530. What statistical concept is used to explain the natural difference that exists between a sample mean and the corresponding population mean?

sampling error

What is the first step to be performed in the following mathematical expression, ΣX^2

square each score

Which of the following is an example of a continuous variable?

the amount of time to solve a problem

Which of the following is an example of a discrete variable?

the gender of each student in a psychology class