Exam 12: Understanding Research Results: Description and Correlation

A researcher obtains a -.87 correlation between the age of job applicants and their likelihood to be hired.However,she thinks that job skills may be an important influence.In this case,she should calculate:

The difference between an interval and a ratio scale is that a ratio scale _____,while an interval scale does not.

The principal of a school conducts a survey to compare the number of third grade and sixth grade students who buy their lunch at school.The most appropriate way to describe the results of this survey would be to compare:

A correlation coefficient is always used _____.

How does restricting the range of a variable affect the correlation coefficient?

A regression equation is used to:

A teacher displays her students' test grades on a notice board.As per the results,seven students received grade A,10 students received grade B,18 students received grade C,four students received grade D,and one student received grade E.In statistical terms,this is a _____.

A researcher measures the time taken by subjects to press a button following a signal.This measure is an example of a(n)_____ scale.

When studying the effect of temperature on the sale of ice cream,a researcher records the number of ice cream cones sold on cold days versus those sold on hot days.In this case,the researcher would most likely compare _____ to describe the results.

Which of the following statements is true about ratio scales?

Anastasia finds the relationship between alcohol consumption and reaction time as -.63.However,the relationship between coffee consumption and reaction time is +.52.What can she conclude from this data?

The general form of a regression equation is Y = a + bX.In this equation,Y is the score we wish to predict and X is the known score.What is "a"?

The grades received by 10 college sophomores in a test are A,B,D,A,A,A,C,B,C,and A.From this data,it can be inferred that the mode is _____.

Which of the following would be an appropriate measure of central tendency to summarize data on an ordinal scale?

_____ are calculations used to predict a person's score on one variable when that person's score on another variable is already known.

An interval scale is preferable to an ordinal scale because:

Which of the following examples best represents the use of an interval scale?

With respect to Pearson r,the absolute size of r is the coefficient that indicates the:

When a line graph is employed to represent the number of subjects who received each possible score on a variable,the graph is called a _____.

A teacher displays the results of a test on a notice board.As per the results,half the students scored more than 70 percent in the test,while the remaining scored less than 70 percent.Which measure of central tendency does this scenario represent?