What is NOT a factor that influences researcher degrees of freedom?   A. Deciding how large the sample size will be   B. Adding a covariate to an analysis   C. Choosing which dependent variables will be analyzed   D. Using convenience sampling from the population

What is the primary use of the One - Way ANOVA model? a. To compare variance of groups b. To test linearity of group mean c. To compare group means d. To test variance of the overall mean

Lightning Deaths Refer to the sample data in Cumulative Review Exercise 1. a. What is the level of measurement of the data (nominal, ordinal, interval, ratio)?  b. Are the values discrete or continuous? c. Are the data categorical or quantitative? d. Is the sample a simple random sample?

The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.

Sample Size. How does the sample size affect how close to a normal distribution of either sample means or sample proportion will be?

Suppose you are asked to toss a coin 16 times and calculate the proportion of the tosses that were heads. a.    What shape would you expect this histogram to be and why? b.    Where you do expect the histogram to be centered? c.    How much variability would you expect among these proportions? d.    Explain why a Normal model should not be used here.

If you have a study design that requires two different samples, what sort of test might you consider?    Matched samples test    Independent samples test

Which of the following are the names commonly used for the variable Y in sample regression?   1. covariate variable   2. independent variable   3. predictor variable   4. Explained variable   5. Response variable   6. explanatory variable   7. Predicted variable   8. Dependent variable   9. Criterion variable

Please define the following statistical procedures: -what is an independent samples t-test -what is a dependent samples t-test -what is a one-sample t-test

Consider the following research questions/study scenarios. For each study, discuss the most appropriate methods for describing the data (graphically and numerically).  What statistical method would be most appropriate for addressing the research questions?  Be sure to provide a justification of the statistical method.  What statistical test is needed, provide appropriate null and research hypotheses. An investigation of the association between drink preferences and the color of teeth is proposed. Subjects will be surveyed as to the type of drink most often consumed (coffee/tea. Juice, caramel-colored soda, water, or milk).  A clinical exam will be performed after dental cleaning to determine the color of the teeth (reddish brown, reddish yellow, gray, reddish gray).