1) Balancing the sample size in a data set where you wish to test the mean thumbnail size between men with red hair and men with brown hair, is important because:

a) It is aesthetically more pleasing to have this balance in your graph

b) It reduces the standard error of the estimate

c) it is good to have differences in your estimate quality for the two groups being compared

d) It increases the standard error of the estimate

2) Which of the following should you use an ANOVA to test?

a) You wish to test whether recovery rate from a disease is faster for those given a placebo or those given a new drug

b) You wish to test whether height is more variable for humans on any of three different islands

c) You wish to test whether height increases across a gradient of foot size

d) You wish to test whether spiders in any of three size classes are faster

3) You wish to test whether there is a positive correlation between redness of the nose and the average amount of alcohol consumed per week.Your null hypothesis is:

a) The correlation coefficient for nose-redness and alcohol consumption is greater than zero

b) The correlation coefficient for nose-redness and alcohol consumption is not zero

c) There is a correlation between alcohol consumption and nose-redness

d) The correlation coefficient for nose-redness and alcohol consumption is zero

4) You wish to test whether you can predict how green a person's skin will become based on the level of gamma radiation they have been exposed to (the Incredible Hulk effect). You conduct this highly unethical experiment on 30 randomly selected individuals. Which of the following is your alternative hypothesis?

a) The slope of the relationship between skin greenness and gamma radiation exposure is not equal to zero

b) The slope of the relationship between skin greenness and gamma radiation exposure is greater than zero

c) The slope of the relationship between skin greenness and gamma radiation exposure is equal to zero

d) The slope of the relationship between skin greenness and gamma radiation exposure is less than zero