1. The correlation coefficient, r, must have a value between 0 and 1. Select one: a. true b. false c. not enough information given 2. If r has the value of 0.60, then 60% of the variability in y can be explained by the variability in x. Select one: a. true b. false c. not enough information given 3. A high correlation between two variables suggests that a change in the independent variable (x) will cause a change in the dependent variable (y). Select one: True False 4. The null hypothesis of no correlation between two variables can never be rejected if r is less than zero. Select one: a. true b. false c. not enough information given 5. If the slope of the regression line is negative, then the relationship between the independent and dependent variable is called _____________. Select one: a. direct b. abstract c. inverse d. platonic e. avuncular 6. The following constitute a random sample of 14 measurements for the temperature of an indoor pool: 84.2, 88.7, 85.1, 80.5, 83.4, 85.6, 76.2, 80.9, 79.3, 83.0, 83.7, 86.3, 88.3, 84.8 Use the onesample sign test to determine the pvalue for the null hypothesis the population median = 83.0 against the alternative hypothesis the population median is greater than 83.0. Express your answer rounded to 3 places of decimal. Note that you don't have to have a specific value of (alpha) in order to find the pvalue. 7. A sample of 12 patients had their lung capacity measured before and after a certain treatment with the following results: Patien t 1 2 3 4 5 6 7 8 9 10 11 12 Before 750 860 950 830 750 680 720 810 750 680 720 83 0 After 850 880 930 860 800 740 760 800 800 640 750 80 0 Use the Sign Test to test the hypothesis that the treatment provides an increase in lung capacity. State your p value rounded to 3 places of decimal. 8. The urinary fluoride concentration (PPM) was measured both for a sample of livestock grazing in an area previously exposed to fluoride pollution and for a similar sample grazing on an unpolluted region. Polluted: 21.3, 18.7, 23.0, 17.1, 16.8, 20.9, 19.7 Unpolluted: 14.2, 18.3, 17.2, 18.4, 20.0 Use the U test to see if there is evidence at the 5% level of significance to conclude the true average fluoride concentration for livestock grazing on the polluted region is larger than for the unpolluted region. For this question state the appropriate critical value of U as a whole number. 9. Same data as question 8, state the appropriate calculated value of U. 10. For the data below, find the W1 value which you would use if you were going to do a U test. Don't bother to do the test. Sample 1: 7, 12, 20, 21, 9 Sample 2: 25, 6, 11, 12, 20, 20