Biostatistics

What is regression in statistics?

• A value that indicates the dispersion of the data

• A technique for investigating and modeling the relationship between variables

• A method for determining causality between variables

• The measure of the average relationship between two or more variables

What is the range of correlations?

• From -1 to 0

• From 0 to 1

• From +1 to -1

• From 0 to -1

What does the value F represent in ANOVA?

• The value that indicates the trend of the data towards a central point

• The proportion of the total variation in the dependent variable explained by the variation in the independent variable

• The measure of the dispersion of the data around the mean

• The test statistic that indicates if the samples are significantly different from each other

What is the null hypothesis in ANOVA?

• There is no significant difference between the groups; any observed difference may be due to chance and sampling error

• The proportion of total variation in the dependent variable explained by the variation in the independent variable

• There is a significant difference between the groups; the observed differences are likely not due to chance or sampling error

• The measure of the dispersion of the data around the mean

What is the purpose of regression in statistics?

• Investigate and model the relationship between variables

• Determine the causality between variables

• Measure the dispersion of the data around the mean

• Indicate the trend of the data towards a central point

What does the value b represent in the regression equation?

• The proportion of the total variation in the dependent variable explained by the variation in the independent variable

• The expected change in Y per unit of X

• The measure of the dispersion of the data around the mean

• The test statistic that indicates if the samples are significantly different from each other

What is the alternative hypothesis in ANOVA?

• The proportion of the total variation in the dependent variable explained by the variation in the independent variable

• The measure of the dispersion of the data around the mean

• There is no significant difference between the groups; any observed difference may be due to chance and sampling error

• There is a significant difference between the groups; the observed differences are likely not due to chance or sampling error

The ANOVA test is a statistical test that can be done in place of multiple T-tests

• True

• False

 In IB ESS, if given a choice, you will want to select "____ way ANOVA"

• simple

• two

• one

• both

If critical F < Obtained F then...

• Accept the null hypothesis

• Accept the alternative hypothesis