Connect 20

Identify the scales of measurement that are associated with parametric statistics. (Check all that apply.)

Ratio scales Interval scales

Which of the following is a ratio of the difference between two sample means and the standard error?

The t value

Identify a true statement about bar charts.

They are excellent tools to display both relative and absolute magnitudes, differences, and change.

Which of the following is true of mean, median, and mode?

They locate the center of a distribution.

An unproven supposition or proposition that temporarily explains certain facts or phenomena is called a(n) _____.

hypothesis

The most common value in the set of responses to a question is called the

mode

The value that represents the highest peak in a distribution's graph is called the _____.

mode

Linda, a researcher, wants to conduct a study to understand the impact of a discount in a client's apparel store on customers who are 20 years old, 40 years old, and 60 years old. In order to do this, Linda must use _____.

one-way analysis of variance (ANOVA)

Similar to the univariate t-test, the bivariate t-test _____.

requires ratio or interval data

Sometimes, the _____ is also used as a distribution's measure of dispersion.

variance

Calculate the mean for the following distribution: 3, 4, 4, 9, 7, 6, 2, 5, 5.

5

Which of the following describes how close to a measure of central tendency the rest of the values in the distribution fall?

A measure of dispersion

The test used to statistically evaluate the differences between the group means in analysis of variance (ANOVA) is called the

F Test

Identify the true statements about the mean as a measure of central tendency. (Check all that apply.)

It can be calculated when the data scale is either ratio or interval. It is fairly insensitive to the addition or deletion of data values.

Which of the following is true of analysis of variance (ANOVA)?

It does not identify which pairs of means are significantly different from one another.

A statistical technique that determines whether three or more means are statistically different from one another is called _____.

analysis of variance (ANOVA)

A(n) shows tabulated data in the form of bars that may be horizontally or vertically oriented.

bar chart

Measures that are directly obtained from a sample or determined from the data in the sample are called _____.

sample statistics

VariancebetweengroupsVariancewithingroups is the formula for calculating _____.

the F ratio

True or false: If one assumes two or more groups are from separate populations then the different groups are considered related samples for conducting statistical tests.

False

True or false: The analysis of variance (ANOVA) technique enables researchers to identify which pairs of means are significantly different from each other.

False

A(n) - test is a test that flags the means that are statistically different from each other; it is performed after an analysis of variance (ANOVA) determines there are differences between means.

Follow up

Identify the features of cross-tabulation. (Check all that apply.)

It gives research analysts a strong tool to summarize survey data. It is easy to create an endless variety of cross-tabulation tables.

Identify the true statements about the Scheffé procedure. (Check all that apply.)

It identifies differences between all pairs of means at low and high ranges of confidence intervals. It holds experimental error rate to α, which causes wider confidence intervals than in other methods.

Identify a true statement about cross-tabulation.

It is used to determine if there is a difference between subgroups of the total sample.

Identify the true statements about the median as a measure of central tendency. (Check all that apply.)

It is useful for data values that are distorted to either the left or the right. It is particularly helpful as a central tendency measure for ordinal data.

Identify the measures of central tendency. (Check all that apply.)

Mean Median Mode

Which of the following measures are appropriate when outliers are present in interval or ratio data? (Check all that apply.)

Mode Median

Identify the measures of dispersion.

Standard deviation Range

Identify the measures of dispersion. (Check all that apply.)

Standard deviation Range

A hypothesis test that utilizes the t distribution and is used when the sample size is smaller than 30 and the standard deviation is unknown is called a(n)

T test

Which of the following provides a mathematical means of calculating if the difference between two sample means occurred by chance?

T test

X1-X2SX1-X2 is the formula to calculate _____, where X1 = mean of sample 1, X2 = mean of sample 2, and SX1 - X2= standard error of the difference between the two means.

T value

True or false: Sample statistics are useful in drawing inferences about a population's parameters.

True

True or false: Unlike the univariate test, in the bivariate test, researchers assume that samples are taken from populations with normal distributions and that there are equal variances in the populations.

True

The method of examining three or more group means that involve only a single independent variable is called _____.

one-way analysis of variance (ANOVA)