psych stats

Statistic

A characteristic, usually a numerical value, which describes a sample is called a ___.____

True

A correlational study is used to examine the relationship between two variables but cannot determine whether it is a cause-and-effect relationship.

A nominal or an ordinal scale

A discrete variable must be measured on?

5

A population of n = 8 scores has SX = 40. What is the population mean?

N=9

A population with a mean of m = 6 has SX = 54. How many scores are in the population?

Parameter

A researcher is curious about the average monthly cell phone bill for high school students in the state of Florida. If this average could be obtained, it would be an example of a ______.

The median

A researcher is measuring the amount of time needed to solve a set of anagrams for a sample of n = 15 students. However, one of the participants fails to solve the problems so the researcher has an undetermined score. What is the best measure of central tendency for these data?

Sample

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 _______.

9

A sample of n = 15 scores ranges from a high of X = 11 to a low of X = 3. If these scores are placed in a frequency distribution table, how many X values will be listed in the first column?

For the combined sample, n = 10, SX = 72, and M = 7.2.

A set of n = 3 scores has a mean of M = 10. Another set of scores has n = 7 and M = 6. If these two sets of scores are combined, what is the mean for the combined group?

24-25

A set of scores ranges from a high of X = 24 to a low of X = 5. If these scores were put in a frequency distribution table with an interval width of 2 points, which of the following would be the top interval in the table?

5 points

A set of scores ranges from a high of X = 72 to a low of X = 28. If these scores were put in a grouped frequency distribution table, what would be the best choice for the interval width?

Interval or ratio

After measuring two individuals, a researcher can say that Tom's score is 4 points higher than Bill's. The measurements must come from a(n) _______ scale.

Sample; population

Although a research study is typically conducted with a relatively small group of participants known as a _________, most researchers hope to generalize their results to a much larger group known as a _________.

Ordinal

Determining the class standing (1st, 2nd, and so on) for the graduating seniors at a high school would involve measurement on a(n) _____ scale of measurement.

teaching methods; the social skills that are learned

For an experiment comparing two methods of teaching social skills training to autistic children, the independent variable is _______ and the dependent variable is _______.

2 variables are measured and there is only 1 group of participants.

In a correlation study,

on the left side of the distribution

In a distribution with positive skew, scores with the highest frequencies are _____.

y axis; x axis

In a frequency distribution graph, frequencies are presented on the , and the scores (categories) are listed on the

it is below the mean by 5 points

In a population of N = 6, five of the individuals all have scores that are exactly 1 point above the mean. From this information, what can you determine about the score for the 6th individual?

1 variable is measured and 2 groups are compared.

In an experimental study,

Descriptive statistics

Organizing a set of scores in a table is an example of using _______.

Population

Parameter=

sample

Statistic=

Nominal

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?

Sampling error

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?

Ratio

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

Ratio

What scale of measurement is being used when a teacher measures the number of correct answers on a quiz for each student?

The gender of each student in a psychology class

Which of the following is a discrete variable

The amount of time to solve a problem

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

Histograms and polygons

Which types of graphs are used for data from an interval scale?