A researcher conducts a study to investigate the influence of the amount of noise in the environment on the number of errors a person makes. The following means were obtained. What conclusion should be drawn from this experiment?

A researcher conducts a study to investigate the influence of the amount of noise in the environment on the number of errors a person makes. The following means were obtained. What conclusion should be drawn from this experiment?

Low | Med | High
x̄=7 | x̄=11 | x̄=14

A. Apparently, there is no relationship between noise level and number of errors.
B. Apparently, there is a relationship: as number of errors increases, the noise level also increases from around 7 to around 11 to around 14.
C. Apparently, there is a relationship: As the number of errors increases. the noise level also increases from low to medium to high.
D. Apparently there is a relationship: As the noise level increases, the number of errors also increases from around 7 to around 11 to around 14.


Answer: Apparently there is a relationship: As the noise level increases, the number of errors also increases from around 7 to around 11 to around 14.

An experimenter investigated the ability to concentrate as a function of eye color. Eye color was classified as having either, brown eye, or other eye color. which type of graph should the experimenter use to display the results?

An experimenter investigated the ability to concentrate as a function of eye color. Eye color was classified as having either, brown eye, or other eye color. which type of graph should the experimenter use to display the results?

A. X and Y
B. Histogram
C. Bar
D. Line


Answer: Bar

When we graph results from an experiment where the independent variable is on a nominal scale, which type of graph is appropriate

When we graph results from an experiment where the independent variable is on a nominal scale, which type of graph is appropriate

A. line graph
B. Histogram
C. Normal curve
D. Bar Graph.


Answer: Bar Graph

On any graph a horizontal line of data points indicates that

On any graph a horizontal line of data points indicates that

A. the Y scores are changing as the X scores change, and there is a relationship present.
B. The Y score are not changing as the X scores change, and there is no relationship present.
C. the independent and dependent variables have been placed on the wrong axes and should be reversed.
D. every score is occurring with a different frequency


Answer: The Y score are not changing as the X scores change, and there is no relationship present.

When we graph results from an Experiment, a line graph is appropriate when

When we graph results from an Experiment, a line graph is appropriate when

A. The independent variable is interval or ratio
B. The independent variable is nominal or ordinal
C. The dependent variable is nominal or ordinal.
D. The dependent variable is interval or ratio


Answer: The independent variable is interval or ratio

When we graph the results of an experiment, the Y axis indicates the

When we graph the results of an experiment, the Y axis indicates the

A. measure of central tendency we have used for the dependent variable.
B. Raw score values for each subject on the dependent variable.
C. Raw scores for each of the independent variable.
D. Levels of the independent variable.


Answer: measure of central tendency we have used for the dependent variable.

When deciding which type of graph (bar, line, histogram, etc.) is appropriate, we consider the characteristics of the

When deciding which type of graph (bar, line, histogram, etc.) is appropriate, we consider the characteristics of the

A. Variability of the distribution
B. Mean.
C. Independent variable.
D. Dependent variable.


Answer: Independent variable.

In a graph of the relationship between the level of nose in a environment and the number of errors a person makes, the ____ is on the X axis and the ____ is on the Y axis.

In a graph of the relationship between the level of nose in a environment and the number of errors a person makes, the ____ is on the X axis and the ____ is on the Y axis.

A. Number of errors; frequency of errors
B. level of noise; number of errors
C. level of noise; frequency of noise
D. number of errors; level of noise


Answer: level of noise; number of errors

A researcher has conducted an experiment in which the independent variable is room temperature. Two conditions (a hot room and a cold room) were used. The dependent variable was the length of time required to complete a jigsaw puzzle. What is the best way to state the there is a relationship?

A researcher has conducted an experiment in which the independent variable is room temperature. Two conditions (a hot room and a cold room) were used. The dependent variable was the length of time required to complete a jigsaw puzzle. What is the best way to state the there is a relationship?

A. The mean times to complete the puzzle are not different fro the two room conditions.
B. The mean room temperatures are not different for the length of time required to complete the jigsaw puzzle.
C. The mean times complete the puzzle are different for the two room conditions.
D.The mean room temperatures are different for the length of time required to complete the jigsaw puzzle.


Answer: The mean times complete the puzzle are different for the two room conditions.

When deciding which type of measure of central tendency is appropriate, we consider the scale of measurement used to measure the.

When deciding which type of measure of central tendency is appropriate, we consider the scale of measurement used to measure the.

A. variability of the distribution.
B. Mean.
C. Independent variable.
D. Dependent variable.


Answer: Dependent variable.

The population mean is estimated by

The population mean is estimated by

A. calculation the mean of as many scores as we can get from the population.
B. calculation the mean of a random sample drawn from the population.
C. calculating the mean of a random sample drawn from the population.
D. calculating all measures of central tendency for a random sample from the population.


Answer: calculation the mean of a random sample drawn from the population.

When it is impossible to obtain all the scores in a depopulation, the best estimate of the population mean is the

When it is impossible to obtain all the scores in a depopulation, the best estimate of the population mean is the

A. population median.
B. sample mean.
C. sample mode.
D. sample median.


Answer: sample mean.

μ is the symbol for the

μ is the symbol for the

A. population median.
B. population mode.
C. population mean.
D. sample mean.


Answer: population mean.

Five students took a personality test. Their deviation scores were -4 +3 +1 -2 +2. Assuming that these scores form a normal distribution, which of the following orders represents their ranking in terms if frequency, from highest to lowest?

Five students took a personality test. Their deviation scores were -4 +3 +1 -2 +2. Assuming that these scores form a normal distribution, which of the following orders represents their ranking in terms if frequency, from highest to lowest?

A. +1, +2 and -2, +3, -4
B. -4, +3, +2 and -2, +1
C. -4, -2, +1, +2, +3
D. +3, +2, +1, -2, -4


Answer: +1, +2 and -2, +3, -4

Five students took a personality test. Their deviation scores were -4 +3 +1 -2 +2. Assuming that these scores form a normal distribution, which score(s) would have the highest frequency?

Five students took a personality test. Their deviation scores were -4 +3 +1 -2 +2. Assuming that these scores form a normal distribution, which score(s) would have the highest frequency?

A. -4
B. +3
C. -2, and +2
D. +1


Answer: +1

Five students took a personality test. Their deviation scores were -4 +3 +1 -2 +2. Assuming that these scores form a normal distribution, which deviation represents the highest raw score?

Five students took a personality test. Their deviation scores were -4 +3 +1 -2 +2. Assuming that these scores form a normal distribution, which deviation represents the highest raw score?

A. -4
B. +3
C. +2
D. +1


Answer: +3

With respect to a graph of a frequency distribution, a positive deviation score

With respect to a graph of a frequency distribution, a positive deviation score

A. will be located to the right of the mean.
B. will be located to the left of the mean.
C. cannot be found.
D. indicated the raw score's location relative to the median.


Answer: will be located to the right of the mean.

A deviation score is more informative than a raw score because it

A deviation score is more informative than a raw score because it

A. describes the shape of the distribution.
B. has a greater numeric value.
C.. is a transformation of the raw score.
D. gives the score's location relative to the mean.


Answer: gives the score's location relative to the mean.

When the mean is used to predict scores, a deviation (x - x̄) indicates

When the mean is used to predict scores, a deviation (x - x̄) indicates

A. the sample is representative of the population.
B. the difference between the x̄ we predict and the score an individual actually gets.
C. the sum of all the deviations.
D. the individual's observed score.


Answer: the difference between the x̄ we predict and the score an individual actually gets.

For the following set of scores, what is (are) (x - x̄)? 7,8,10,10,11,12,13,13,15

For the following set of scores,
what is (are) (x - x̄)?
7,8,10,10,11,12,13,13,15

A. 4,3,2,1,0,-1,-2,-2,-4
B. -4,-3,-1,-1,0,1,2,2,3,
C. 4,3,1,1,0,1,2,2,4
D. 0


Answer: -4,-3,-1,-1,0,1,2,2,3,