Psych 310- Statistics Exam

A researcher is looking for a specific study report, in which he knows the kurtosis value. He reads the following kurtosis value in various reports. Which one supports a mesokurtic distribution?

0

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?

10

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

100% of the scores fall between -3 and +3 standard deviations from the mean

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

22

99.7% of the scores in a distribution fall

3 sds of the mean

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:

54 and 66

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

6

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?

8

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?

85

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

Absolute zero

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?

Factor Analysis

The larger the standard deviation, the more scores will tend to cluster around the mean.

False

In comparing Spearman's Rho to Phi Coefficient, one would generally prefer to use Spearman's Rho when correlating:

Likert scale responses

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?

Medium

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?

Rank in the military

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

Regression

_________________ is the most frequently used measure of variability

Standard deviation

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 a(an):

Stronger correlation between the variables in the follow-up study

A good example of an interval scale of measurement is temperature.

True

A histogram is a type of graph that uses vertical lines and bars to portray the distribution of test scores.

True

Pearson Product Moment Correlation (r) is used for measuring a linear relationship between two continuous variables.

True

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 linear relationship exists between variables

The mean is the ________ of an array of test scores

average

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:

increase

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

only a few of the answers due to low scores

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 a(an):

outlier

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

there is an absence of correlation