Unit 6: Statistic Review for Test

• The range in shelter A is 11, and the range in shelter B is 4.

• The range in shelter A is 20, and the range in shelter B is 10.

• The range in shelter A is 13, and the range in shelter B is 8.

• The range in shelter A is 22, and the range in shelter B is 18.

• There is a gap in both plots.

• There is a gap in Anika's scores, but not in Lorenzo's scores.

• The data is widely spread across both plots.

• The data is more widely spread for Lorenzo's scores than for Anika's.

• Most of the data in each plot are greater than 48.

• Most of the data in each plot are less than 48.

• Most of the data in each plot are around 41.

• Most of the data in each plot is around 60.

When Henry surveyed 45 7th grade students at random in the school cafeteria, he found that 3 out of 15 liked reggae music. Using proportional reasoning, about how many of the 180 7th grader students in his school like reggae?

• About 12 seventh-grade students like reggae music.

• About 36 seventh-grade students like reggae music.

• About 60 seventh-grade students like reggae music.

• About 108 seventh-grade students like reggae music.

Which best describes a random sample?

• a sample in which the elements are chosen by chance

• a sample in which the chosen elements are predetermined

• a sample in which each element of the population is chosen

• a sample in which the chosen elements are removed from the population once they are chosen

A professor wants to determine information about the Internet usage of middle school students in one state. A sample of 500 boys and girls from middle schools across the state were asked, "How do you access the Internet when you are not at school?" Which best explains why the sample can be used to determine statistics that apply to the population?

• The sample is larger than the population.

• The sample represents the population.

• Each person in the population knows at least one person included in the sample.

• Each person in the sample has Internet access while they are not at school.

A survey of a group of 7th graders and a group of teachers at a local middle school asked how many siblings they each have. The dot plots below show the results:

Based on the shape of the two dot plots, which statements correctly compare them? Select three choices.

• The center of the data for students has a value less than that of the center of the data for teachers.

• The center of the data is to the right of the dot plot for both teachers and students.

• There is a greater variation in the data for teachers than for students.

• Both sets of data cluster around 2.

• The same number of teachers as students were surveyed.

Li designed a survey to determine how comfortable student at her middle school are with fractions. There are 600 students in her middle school. The students are equally distributed among grade levels. She selected a sample of 28 students in her first-period class. Which best explains Li's sample?

• random and biased

• random and unbiased

• nonrandom and biased

• nonrandom and unbiased

• No, it is not representative because literature books were chosen much more often than the other types.

• Yes, it is representative because each type of book was chosen a unique numbers of times.

• Yes, it is representative each type of book was represented in the approximate proportions that exists in the library.

• Yes, it is representative because each type of book was selected as part of the sample.

A nutritionist wants to know how the taste of artificial sweeteners impacts food choices of diabetic patients. From which groups would it be best to take a sample?

• all patients

• both type 1 and type 2 diabetic patients

• patients who do not eat any artificial sweeteners

• patients who eat mostly artificially sweetened foods