QUESTION 1 1. A researcher tests whether cocaine use increases impulsive behavior, which is measured as the number of impulsive events per hour. The researcher gives either 0 ng, 10 ng, 15 ng, or 20 ng to each group of mice. What is the dependent variable? The dosage supplied to the mice What is the independent variable? the number of impulsive events per hour Is the dependent variable continuous or discrete? Discrete because there are only four dosages (0 ng, 10 ng, 15 ng, or 20 ng) that can be given to the mice o Is the independent variable continuous or discrete? Discrete because the mice can only take on at certain intervals (number of impulsive events per hour) 0 What is the level-of-measurement of the dependent variable? The level of measurement is a ratio because you can categorize, rank and infer equal intervals and there is a true zero point QUESTION 2 1. In a study conducted in 2008, Salska recorded height minimums and maximums that participants indicated they would be comfortable dating. The data are summarized below. Shortest Acceptable Height Tallest Acceptable Height 0 Which group, men or women, showed more variation for their shortest acceptable heights? 0 For the layperson, explain what the standard deviation of 2.2 means compared to the standard deviation of 2.7 as seen in the data for tallest acceptable heights. QUESTION 3 1. Interpret the z-soore of 1.45 in terms of its relationship to standard deviation as well as the proportion of those observations that will be higher in a normal distribution of data