Biostats final

Indicators of multi-colinearity

-Large charge in estimated regression coefficient when a variable is added or deleted. -high correlation coefficient between variables -negative sign on variables parameter estimate.

To test the null hypothesis that the parameter of the slope is zero, the test statistic value is

12.525

The estimate of the standard deviation of fire damage for all homes the same distance from the fire station is

2.31635

means

Analysis of variance is a statistical method of comparing the ______ of several populations

There is no interaction

For one way ANOVA, which of the following statements are true?

response or dependent variable

In regression analysis, the variable that is being predicted is the

One response and one or more independent variables are related

Regression modeling is a statistical framework for developing a mathematical equation that describes how

two independent and one dependent variable

The two way analysis of variance has:

The interpretation of 0.9235, the value of R-square is

92.35% of the sample variability in fire damage can be attributed to a linear relationship with the distance to the fire station.

12

Prior to introducing a new cake mix to the public, a food company wishes to determine the combination of baking temperature and baking time will result in the best tasting cake. In their experiment, cakes made from the next cake mix are baked at 325 degrees F, 350 degrees F, and 400 degrees F for 50 minutes, 60 minutes, 70 minutes, and 80 minutes. taste is rated for each combination of baking temperature and baking time. How many treatments are in the experiment?

true

The F* or test statistic in an ANOVA is the ratio of the variation between samples to the variation within

As a test for differences in pairwise means

The Tukey's test can be used for what purpose?

You will find the value 4.919331 in the print out under parameter estimates. This is interpreted as

The mean fire damage will be estimated to increase 4,919.33 for each mile from the fire station

F=MSB/MSE

There are three distinct F tests to perform a two way ANOVA. Which of the following is one of these tests?

sample size, number of groups

To determine whether the test statistic of ANOVA is statistically significant at a given alpha, it can be compared to a critical value. What two pieces of information are needed to determine the critical value?`

Describe those groups that have reliable differences between group means.

What is the function of a post test in ANOVA?

between 0 and infinity

When conducting an ANOVA, F* will always fall within what range?

When you do not have a small set of comparisons

When would the bonferroni test not be advisable for Post Hoc test?

All of the above

Which of the following is an assumption of one way ANOVA when comparing samples from two or more experimental treatments?

the sample sizes are not equal

Which of the following is not required condition for one way ANOVA?

false

While conducting a two way ANOVA, you conclude that significant interaction does exist between factor 1 and factor 2. Your next step should be to test the significance of the main effects.

At least two treatments are different from each other in terms of their effect on the mean response.

You obtained a significant test statistic when comparing three treatments in a one way ANOVA. In words, how would you interpret the alternative hypothesis Ha?

The difference between the actual value of y and the predicted value of y (y-hat) is called

a residual

close to 1.00

if the true means of the k populations are equal, then MSTR/MSE should be