AP STATS: CHAPTER 1.1 PRACTICE

The graph shows the percent of surveys returned and not returned for each delivery method. Which statement about delivery method and rate of survey return is supported by the graph?

The In Class delivery method had the greatest rate of return, and the Dining Hall delivery method had the least rate of return.

The back-to-back stem-and-leaf plot below gives the percentage of students who dropped out of school at each of the 49 high schools in a large metropolitan school district. Which of the following statements is NOT justified by these data?

The drop-out rate decreased in each of the 49 schools between the 1989-90 and 1992-1993 school years.

The prices, in thousands of dollars, of 304 homes recently sold in a city are summarized in the histogram below. Based on the histogram, which of the following statements must be true?

The median price is not greater than $750,000.

A child psychologist asked 100 five year olds and 50 ten year olds to name their favorite color. Their results are shown in the following table. Which of the following statements is supported by the table?

The percentage of five year olds who selected red or blue as their favorite color is greater than the percentage of ten year olds who selected red or blue as their favorite color.

As part of a community service program, students in three middle school grades (grade 6, grade 7, grade 8) each chose to participate in one of three school-sponsored volunteer activities. The graph below shows the distribution for each class for the three activities. Based on the graph, which statement must be true?

For students in grade 7, the number who chose activity C was greater than the number who chose activity B.

The following pie chart summarizes the results of a survey given to airlines about the primary reason for flight delays. Which of the following statements is supported by the pie chart?

More delays were caused by weather than by all other reasons combined.

The following list shows the number of video games sold at a game store each day for one week. Which of the following is the best classification of the data in the list?

Quantitative and discrete

The figure above summarizes the heights, in centimeters, of approximately 400 pine seedlings six years after they were planted at a center for environmental study. Approximately half of the trees were fertilized yearly, and the remaining trees were never fertilized. Which of the following statements about the medians and interquartile ranges (IQRs) of the heights of the two groups of trees 6 years after being planted is true?

The median for the unfertilized trees is less than the median for the fertilized trees, and the IQR is greater for the unfertilized trees.

Grain moisture is a characteristic of grain that affects the price paid for the grain. A random sample of 28 loads of corn was evaluated for moisture as a percent of the total weight. A different random sample of 28 loads of soybeans was also evaluated for moisture. The data are displayed in the dot plots below. Based on the dot plots, which of the following is greater for the percent moisture of corn than for the percent moisture of soybeans?

The range

Which of the following statements must be true about the data sets A and B displayed in the histograms above?

The standard deviation of data set A is greater than the standard deviation of data set B.

Researchers conducted a telephone survey of 427 adults living in a large city. The adults were asked whether they planned to purchase a smart watch in the next year. The table shows the responses categorized by the region of the city in which the residents live. Which of the following graphical displays is most appropriate for comparing the proportions of those surveyed who plan to purchase a smart watch within the four regions?

A segmented bar chart

A sample of 100 students from Liberty High School and a sample of 60 students from Central High School were asked what they planned to do after graduation. Responses fell into five categories: four-year university (4Y)(4Y), community college (CC)(CC), join the workforce (W)(W), join the military (M)(M), or undecided (UD)(UD). The results are shown in the following bar chart. Which of the following statements is supported by the bar chart?

For the category undecided, the number of students from Liberty High School was 4 greater than the number of students from Central High School.

In a certain school district, students from grade 6 through grade 12 can participate in a school-sponsored community service activity. The following bar chart shows the relative frequencies of students from each grade who participate in the community service activity. Which of the following statements is supported by the bar chart?

Grade 12 had the least relative frequency of participating students.

The following bar chart shows the relative frequency of days of rain for 30 days in four regions of a certain state. Which of the following statements is not supported by the bar chart?

Region C had more than 25 days of rain.

A veterinarian collected data on the weights of 1,000 cats and dogs treated at a veterinary clinic. The weight of each animal was classified as either healthy, underweight, or overweight. The data are summarized in the table. Based on the data in the table, which of the following is the most appropriate type of graph to visually show whether a relationship exists between the type of animal and the weight classification?

Segmented bar chart