stats review semester

Which of the following is the best estimate of the standard deviation of the distribution in the figure?

• 18

• 9

• 54

• 97

• 106

Tags

CCSS.HSS.ID.A.3

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.4

A company determines the mean and standard deviation of the employees' salaries in one year. What is the best description of the standard deviation?

• Approximately the median distance between the individual salaries of employees and the mean of every employee's salary.

• The amount of money separating the highest salary from the lowest salary when considering the middle 50% of the distribution.

• The amount of money separating the highest salary from the lowest salary when considering all employees.

• The distance between the salary of an employee and the mean salary of all the employees.

• Approximately the mean distance between the individual salaries of employees and the mean of all employees' salaries.

Tags

CCSS.HSS.ID.A.3

CCSS.HSS.ID.A.4

The equation of the LSRL for the points on a scatterplot is ŷ = 5.3-0.23x. What is the residual for the point (5, 4)?

• -0.15

• 0.15

• 1

• 0.62

• 0.85

The graph shows the distribution of scores of 30 students on a mathematics test. Based on the histogram, which statement must be true?

• The lowest test score is 41%.

• The highest test score is 100%.

• The mean test score is between 81% and 90%.

• The median test score is not greater than 80%.

• The lower quartile of the test scores is greater than 60%.

Tags

CCSS.HSS.ID.A.3

CCSS.HSS.ID.A.1

CCSS.HSS.ID.A.2

In a certain school, students can choose whether to eat in the school’s cafeteria. A reporter working for the school’s newspaper polled students on their reactions to changes in the menu at the cafeteria. For each student leaving the cafeteria in one 20-minute time period, the reporter used a die to determine whether to stop the student and ask how he or she felt about the new menu. In the reporter’s article it was stated that a random sample of the students showed that 23% of the school’s student population was happy with the new menu. Which of the following statements is true?

• Because each student leaving the cafeteria was randomly selected and could choose to answer or not, this is a random sample of the student population, and the 23% is an accurate measurement of the school population’s view of the new menu.

• Because students self-selected whether to eat in the cafeteria, the sampling method might be biased and the sample might not be representative of all students in the school.

• The survey would have been more effective if the reporter had collected the data in one 10-minute time period rather than in one 20-minute time period.

• The survey would have been more effective if students who cared about the food could have called the reporter to tell how they felt about the new menu, so that only students with opinions on the subject would have been surveyed.

• Because no treatment was imposed on the students eating in the cafeteria, one cannot make any conclusions about the new menu.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

CCSS.HSS.IC.B.6

The student government at a high school wants to conduct a survey of student opinion. It wants to begin with a simple random sample of 80 students. Which of the following survey methods will produce a simple random sample?

• Survey the first 80 students to arrive at school in the morning

• Survey every 5th student entering the school library until 80 students are surveyed.

• Use random numbers to choose 20 each of first-year, second-year, third-year, and fourth-year students.

• Number the students in the official school roster. Use a table of random numbers to choose 80 students from this roster for the survey.

• Number the cafeteria seats. Use a table of random numbers to choose seats and interview the students until 80 have been interviewed.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

The segmented bar charts below depict the data from the NAAL (National Assessment of Adult Literacy) conducted in 2003. Based on the graph, which statement must be true.

• The prose literacy level with the greatest percentage of people who volunteered once per week or more was below basic.

• For people with proficient prose literacy level, the number who volunteered once per week or more was greater than the number who volunteered less than once per week.

• Intermediate and proficient prose level had the same number of students who volunteered less than once per week.

• Of all the students that never volunteered, the greatest number were in the below basic level of prose literacy.

• For students who had basic prose literacy level, the number who volunteered less than once per week was greater than those who never volunteered.

Tags

CCSS.HSS.ID.A.1

CCSS.HSS.ID.B.5

The boys and girls basketball teams at a high school had their heights measured at practice. The following data was recorded for their heights. What can you conclude from the distributions?

• The girls have a larger median and a larger range in heights.

• The boys had a smaller median height than the girls; however, the boys had a larger range of heights.

• The median height for the boys and the girls is the same; however, the girls have a larger range.

• The median height for the boys is larger; however, the girls have a larger range.

• No information can be concluded from the distribution since there is no key included.

Tags

CCSS.HSS.ID.A.3

CCSS.HSS.ID.A.1

CCSS.HSS.ID.A.2

The boxplots summarize two data sets, 1 and 2. Which of the following must be true?

I. Class #2 contains more data than Class #1.

II. The box of Class #2 contains more data than the box of Class #1.

III. The data in Class #1 has a smaller range than the data in Class #2.

• I only

• I and III only

• I and II only

• I, II, and III

• III only

Tags

CCSS.HSS.ID.A.3

CCSS.HSS.ID.A.1

CCSS.HSS.ID.A.2

Use the table to answer the following question. Of the male subjects in the study, what fraction drive a sports car?

• 39/84

• 39/240

• 39/60

• 60/240

• 84/240

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B