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Question 1
The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. According to the standard deviation rule, almost 2.5% of the students spent more than what amount of money on textbooks in a semester?
Question 2
The 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?
Question 3
A 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 "With whom do you find it easiest to make friends? Opposite sex/same sex/no difference."
These data would be best displayed using which of the following?
The next four questions relate to the same boxplot graph, shown below.
Question 4
The boxplots below display annual incomes (in thousands of dollars) of households in two cities.
Which city has more households?
Question 5
The boxplots below display annual incomes (in thousands of dollars) of households in two cities.
Which city has greater variability in income?
Question 6
The boxplots below display annual incomes (in thousands of dollars) of households in two cities.
Which city has a greater percentage of households with annual incomes above $80,000?
Question 7
The boxplots below display annual incomes (in thousands of dollars) for households in two cities.
Which city has a greater percentage of households with annual incomes between $50,000 and $80,000?
Please answer the question below. Your response will not be graded, but will be available for your instructor to read.
Question 8
What determines which numerical measures of center and spread are appropriate for describing a given distribution of a quantitative variable?
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