ch 8 review

Choose the term that best matches the given definition.

A sample where the population is divided into groups that are similar to the population. Data is collected from every member of the selected groups.

• Random Sample

• Convenience Sample

• Stratified Sample

• Cluster Sample

Identify the population, the sample, and any population parameters or sample statistics in the given scenario. 1000 students at a local college were asked whether they voted in the last election. 77% said yes.

• Population: the student body at a local college; Sample: 1000 students surveyed; Sample Statistic: 77%

• Population: the student body at a local college; Sample: none given; Population Parameter: 77%

• Population: none given; Sample: 1000 students surveyed; Sample Statistic: 77%

Identify the sampling technique used in the given scenario.

The English department is interested in overall performance in its entry-level 101 course. The department chair randomly selects 10 students' final grades from each of the 30 sections offered and calculates the average final grade.

• Random

• Stratified

• Cluster

• Systematic

• Convenience

Identify the sampling technique used in the given scenario.

The English department is interested in overall performance in its entry-level 101 course. The department chair randomly selects 300 students' final grades and calculates the average.

• Random

• Stratified

• Cluster

• Systematic

• Convenience

Identify the sampling technique used in the given scenario.

The financial aid office at a nearby university publishes data about the type and amount of aid offered annually by collecting information from 250 randomly selected students.

• Random

• Systematic

• Convenience

• Cluster

The following table represents a grouped frequency distribution of the number of hours spent at the library per week for 50 students. What is the class width?

The following table represents a grouped frequency distribution of the number of hours spent sleeping per week for 54 students. What is the class width?

The following table represents a grouped frequency distribution of the number of hours spent on the computer per week for 52 students. What is the value of the lower class limit of the 3rd class?

The following table represents a grouped frequency distribution of the number of hours spent on the computer per week for 51 students. What percentage of students used the computer between 14 and 17.4 hours per week? Round your answer to one decimal place, if necessary.

The following table represents a grouped frequency distribution of the number of hours spent on the computer per week for 54 students. What percentage of students used the computer less than 7 hours per week? Round your answer to the nearest tenth, if necessary.