Biostatistics

________ is a collection from the subset of the population

• raw data

• random sample

• population sample

• random data

What kind of relationship does this scatter diagram indicate?

• Negative

• Positive

• No relationship

• It cannot be determined since there are no definite variables.

What kind of relationship does this scatter diagram indicate?

• No relationship

• Positive

• Negative

• Negatively askewed

• r = 0.89, direct relationship

• r = -0.96, inverse relationship

• r = -0.69, inverse relationship

• r = 0.72, direct relationship

It measures the strength and direction of association between two ranked variables.

• ANOVA correlation

• Spearman's rank-order correlation coefficient

• Chi-square correlation

• Kendall's tau

Use the Spearman Rank-Order Correlation to determine whether if there is a relationship between these two variables and find the correlation coefficient. (Click the image to view) The critical value is 0.538. \(p=1-\frac{6\ \Sigma\ d^2}{n\ \left(n^2-1\right)}\)

• p = 0.8868, there is a relationship between the two variables.

• p = 0.8624, there is a relationship between the two variables

• p = 0.4432, there is NO relationship between the two variables

• p = 0.5219, there is NO relationship between the two variables

• x = 0.7617, high direct relationship

• x = -0.2424, negligible inverse relationship

• x = -0.4922, low inverse relationship

• Cannot be determined.

It is a measure of association between two binary variables.

• Correlation Coefficient

• Regression Coefficient

• Chi-Square Statistic

• Phi Coefficient

It is a statistical test that compares the averages or means and standard deviations of two related groups to determine if there is a significant difference between the two groups.

Also known as a dependent t-test

• Nonparametric t-test

• Paired t-test

• Independent t-test

• Unpaired t-test

A gym instructor wants to find out if his training program is statistically significant. In the table are the measured scores of the students before and after the program. Find also the test statistic. The critical value is 2.262. t=\frac{mean\ of\ D\ \times\sqrt[]{n}}{\sqrt[]{\frac{n\ \Sigma\ D^2-\left(\Sigma\ D\right)^2}{n\left(n-1\right)}}}

• t = -0.234, not statistically significant

• t = -3.11, statistically significant

• t = -2.58, statistically significant

• t = 1.24, not statistically significant