32. When a set of numbers is heterogeneous, you can place more trust in the measure of central tendency as representing the typical person or unit. a. True b. False 33. Non-overlapping categories or intervals are known as ______. 34. To interpret the relationship between two categorical variables, a contingency table should be constructed with either column or row percentages, and ----. a. If the percentages are calculated down the columns, then comparisons should be made across the rows b. If the percentages are calculated across the rows, comparisons should be made down the columns c. Both a and b are correct d. Neither a nor b is correct A random sample of data was collected on residential sales in a large city. Blood pressure on average was significantly higher among individuals who lived in houses with more than two bathrooms than individuals who lived in houses with two or fewer bathrooms. What types of inferences can we make? a) We can make causal inferences but not population inferences.
b) We cannot make causal inferences but we can make population inferences. c) We can make both causal and population inferences. d) We cannot make either causal or population inferences. Consider the following scatterplot of gas mileage vs. weight of cars (in thousands of pounds). Which is true: a) The correlation is about 0.7 and the point (*) has a positive residual. b) The correlation is about -0.7 and the point (*) has a negative residual. c) The correlation is about -0.7 and the point (*) has a positive residual. d) The correlation is about 0.7 and the point (*) has a negative residual. Suppose you have a 2.5 grade point average in 3 courses. What is the minimum average you can have in your fourth and fifth courses to ensure your overall grade point average is at least 3? a) 2.25 b) 3.75 c) 3.5 d) 2.75 What is true for a distribution that is skewed left? a) The mean is larger than the median and the sum of deviations is negative. b) The mean is larger than the median and the sum of deviations is zero. c) The mean is less than the median and the sum of deviations is negative. d) The mean is less than the median and the sum of deviations is zero. 39-40 . The grade point averages of a large population of university students are approximately normally distributed with mean 2.2 and standard deviation 0.6. If you need to finish in the top 25% of your class to earn a certain scholarship, what must your grade point average be? a) 2.605 b) 3.376 c) 1.795 d) 2.441Suppose that 4 students are randomly selected from the student body. What is the probability their average grade point average is above 3.0? Pick the closest one. a) 0.0918 b) 0.0038 c) 0.000071 d) 0.25 A measure calculated from a population to describe one of its characteristics is called a) A statistic b) a residual c) an estimate d) a parameter 42-43. A newspaper article reports that in a poll of 120 randomly selected eligible voters, 55% said they will support candidate A in the election. There are only two candidates running.