Exam 3: Statistical Concepts

A research team designed a demographic questionnaire to collect information about participants.Which of the following variables identified on the questionnaire provides an example of an ordinal scale variable?

A student conducting a research study was told by her professor to use a scatterplot in conjunction with calculating the correlation coefficient.She discovered that the data points clustered along a straight line.This means:

A researcher determines that there is a positive correlation between sleep and test scores.This means as the amount of sleep is increased then test scores:

There are 12 participants who agree to take the test for a study focused on wellness.The total of all the participants' scores is 96.What is the mean?

A student is assisting her professor with analyzing data,but cannot remember the difference between regression,factor analysis,and Spearman's rho.Explain how you would determine which analysis to conduct and provide an example for each one.

The variance is determined to be 36.What would be the standard deviation?

The teacher has a small class with only 7 students.The teacher grades their homework and reports scores of: 10,7,8,12,9,11,and 13.What is the median?

A group of researchers is attempting to design an instrument that will measure self-esteem.The researchers have an extensive list of traits that may contribute to this construct.Which analysis may assist the research team in narrowing the list of traits into a few dimensions?

A teacher determines that the correlation between eating breakfast and doing well on the test is zero.This means:

A teacher reports that the class scores are generally distributed according to a bell curve.This means:

A teacher analyzes the scores from a recent test and determines a positively skewed curve.She infers that the majority of students knew:

When looking at a list of students' test scores,the teacher notices that one test score is extremely lower than the majority of the scores.This is known as aan):

The teacher grades the papers and determines the following set of scores: 90,85,87,85,92,90,83,85,98 What is the mode?

In a follow-up study,a researcher reported that the correlation is .85.In the initial study,the correlation was .78.This means there is aan):

When comparing the four scales of measurement,what distinguishes the interval scale from the ratio scale?

If the researcher knows that the mean is 60 and the standard deviation is 6,then the majority of the scores falling between +1 or -1 standard deviation of the mean fall between:

A researcher wants to know if IQ predicts success in college.Which analysis is most appropriate?

The teacher calculates the highest score as being 97 and the lowest score as being 75.What is the range?

In studying the correlation between the number of hours studied and scores on the comprehensive exam,the researcher found a correlation of .30.According to Cohen's guidelines,what would this mean regarding the strength of the relationship?

You are assigned to create a demographic questionnaire for a study.You have the freedom to determine what variables to include;however,you must gather information in 5 questions/statements that includes the following scales: 2 nominal,1 ratio,1 ordinal,and 1 interval.Additionally,you must distinguish which statements/questions are in each scale.