WorksheetsAP Stats Experimental and Sampling Design
Total questions: 27
Worksheet time: 54mins
She selects the five closest to her desk.
Is this a random sample of the drivers in the city?
Is this sample of the jelly beans in the jar likely to be biased?
Wicomico County Public Schools randomly selected 230 teachers to find out which technology resource it's teachers feel is the most effective.
A restaurant wants to know if their customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The restaurant concluded that most customers do not order dessert.
An AP Statistics class starts a project to estimate the average number of hours a student at their high school sleeps per night. Their high school has 1200 students, and they take a sample of the first 120 students that arrive at school on a particular day. They ask each of the 120 students how many hours of sleep they got the night before and then calculate an average. Which of the following statements is an accurate description of the elements of this survey?
Population: the 120 students surveyed. Parameter of interest: the average number of hours a student at this high school sleeps per night.
Sample: the 1200 students of the school. Population: all high school students in the United States. Statistic: the average number of hours a student at this high school sleeps per night.
Sample: the 120 students surveyed. Population: the 1200 students at the high school. Parameter of interest: the average number of hours a student at this high school sleeps per night
Sample: the 120 students surveyed. Population: the 1200 students at the high school. Statistic: The average number of hours a student at this high school sleeps per night.
This is not a survey because a convenience sample was used.
Major League Baseball (MLB) has recently been evaluating the timing of various events during games in an effort to improve the pace of a game. MLB wants to know how long a mound visit, defined as when a coach pauses the game to visit the pitcher on the mound, takes on average. MLB randomly selects 100 games over the course of a season, and records the length, in seconds, of every mound visit that occurs in that game. This sample of mound visits can be best described as a
simple random sample.
systematic sample.
stratified sample.
cluster sample.
block sample.
Twenty volunteers with high cholesterol were selected for a trial to determine whether a new diet reduces cholesterol. The volunteers were given a low-carb, low-calorie diet. After 8 weeks of the diet, the average cholesterol of the volunteers dropped a significant amount. This study is an example of
A controlled experiment.
An uncontrolled experiment.
A double blind experiment.
A blocked design experiment.
An observational study.
The DNR is planning a study to determine whether breakwaters help decrease erosion at a large lake. They divide the shoreline into 100-foot plots, installing some with breakwaters and some without. However, the east and west shorelines of this lake receive very different wave patterns due to the wind. The DNR suspects this will affect the responses to the breakwaters. Because of this, the DNR plans to treat each shoreline as a different group. This study is an example of
An uncontrolled experiment
A blocked design experiment.
A matched pairs experiment.
A stratified random sample.
A randomized observational study
Which of the following are sampling methods? (select all that apply)
SRS
Blocking
Cluster
Convenience
Matched Pairs
Which of the following are types of experiments? (select all that apply)
SRS
Blocking
Cluster
Convenience
Matched Pairs
Suppose the state decides to randomly test high school wrestlers for steroid use. There are 16 teams in the league, and each team has 20 wrestlers. State investigators plan to test 32 of these athletes by randomly choosing two wrestlers from each team. Is this a simple random sample?
Yes, because the wrestlers were chosen at random.
Yes because each wrestler is equally likely to be chosen.
Yes, because stratified samples are a type of simple random sample.
No, because not all possible groups of 32 wrestlers could have been the sample.
No, because a random sample of teams was not first chosen.
An airline that wants to assess customer satisfaction chooses a random sample of 10 of its flights during a single month and asks all of the passengers on those flights to fill out a survey. This is an example of a
convenience sample.
stratified sample.
cluster sample.
simple random sample.
voluntary response sample.
