6) The mean IQ of statistics teachers is greater than 160. Write the null and alternative 6) hypotheses. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 7) The data below are the number of absences and the final grades of 9 randomly selected students 7) from a statistics class. Find the equation of the regression line for the given data. Number of absences, x 0 3 6 4 9 2 15 8 5 Final grade, y 98 86 80 82 71 92 55 76 82 A) y - -2.755x + 96.139 B) y - -96.139x + 2.755 C) y - -2.755x - 96.139 D) y - 96.139x - 2.755 8) The mean score of a placement exam for entrance into a math class is 80, with a standard deviation 8) of 10. Use the Empirical Rule to find the percentage of scores that lie between 60 and 80. (Assume the data set has a bell -shaped distribution.) A) 47.5% B) 34% C) 95% D) 68% 9) Sample annual salaries (in thousands of dollars) for public elementary school teachers are listed. 9) Find the sample standard deviation. 17.0 10.7 38.7 32.1 16.4 15.9 A) 10.97 B) 3453.36 C) 2851.44 D) 35.40 10) Which of the following values could not represent a correlation coefficient? 10) A) 0 B) -1 C) - 1.25 D) 0.927 11) The statement represents a claim. Write its complement and state which is Ho and which is HA. 11) a 8.2 B) Ho: 0