The distribution of the IQ (Intelligence Quotient) is approximately normal in shape with a mean of 100 and a standard deviation of 15. According to the standard deviation rule, what range of IQ scores do many (68%) people have? Between 85 and 115 Between 70 and 130 Between 55 and 145 Less than 85 or more than 115 Above 100Question 2Select one answer.10 pointsThe distribution of the IQ (Intelligence Quotient) is approximately normal in shape with a mean of 100 and a standard deviation of 15. According to the standard deviation rule, only 0.15% of people have an IQ over what score? 55 100 115 130 145Question 3Select one answer.10 pointsThe histogram below shows the times, in minutes, required for 25 rats in an animal behavior experiment to successfully navigate a maze.Which of the following are the appropriate numerical measures to describe the center and spread of the above distribution? The IQR and the standard deviation The median and the IQR The mean and the median The mean and the standard deviationQuestion 4Select one answer.10 pointsA student survey was conducted at a major university, and data were collected from a random sample of 750 undergraduate students. One variable that was recorded for each student was the student's answer to the question: “What region of the country did you live in just prior to enrolling in this university? Northeast/Southeast/Northwest/Southwest/Midwest/Outside the U.S.”These data would be best displayed using which of the following? IQR Histogram Pie chart Boxplot StemplotQuestion 5Select one answer.10 pointsThe boxplots below show the real estate values of single-family homes in two neighboring cities (in thousands of dollars).Which city has more households? Statstown Medianville Both cities have the same number of households. It is impossible to tell from the boxplots.Question 6Select one answer.10 pointsThe boxplots below show the number of marshmallows in a bag, as estimated by students in two elementary school classes.Which class has greater variability in students’ estimate of the number of marshmallows? Ms. Apple’s class Ms. Banana’s class Both classes have the same variability in students’ estimates. It is impossible to tell from the boxplots.Question 7Select one answer.10 pointsThe boxplots below show the number of marshmallows in a bag, as estimated by students in two elementary school classes.Which class has the greater percentage of estimates over 100? Ms. Apple’s class Ms. Banana’s class Both classes have the same percentage of estimates over 100. It is impossible to tell from the boxplots.Question 8Select one answer.10 pointsThe boxplots below show the number of marshmallows in a bag, as estimated by students in two elementary school classes.Which class has a greater percentage of estimates between 50 and 100 marshmallows? Ms. Apple’s class Ms. Banana’s class Both classes have the same percentage of estimates between 50 and 100. It is impossible to tell from the boxplots.Question 9Select one answer.10 pointsBased on the results of a nation-wide study, the number of contacts programmed into cell phones are summarized on the following boxplot:Which of the following is true about this data? The lowest observation is an outlier. The highest observation is an outlier. The data is skewed left. The data is skewed right. There are no outliers.Question 10Select one answer.10 pointsBased on the results of a nationwide study, the number of contacts programmed into cell phones are summarized on the following boxplot:Which interval contains the greatest amount of data? 0–50 50–100 100–150 150–200 It is impossible to tell.