Topic 1
Topic 2
Topic 3
100
A distribution where mean = median = mode
What is a normal Distribution?
100
In a non-normal or normal distribution, the percentage of, at least this much data, found within 1 standard deviation of the mean
What is 75%?
100
If a min =18 = 39 Med = 62 = 76 Max = 100 and there is a total of 416 students that took the exam. The students that had a score of 39 above were
What is 312 students?
200
The name of the distribution you get from taking samples of equal size from a original distribution and plotting it
What is a Sampling Distribution?
200
A recent study showed that teenagers who had night lights in their rooms as babies are more likely to suffer from myopia (near sightedness) than teenagers who had not used night lights. But genetic factors are known to play a role, and near-sighted parents are more likely to install a night light in their children’s room. This makes it hard to tell if the night light caused the myopia. This is an example of
What is a confounding variable?
200
A random sample survey interviewed 3,800 U.S. adults nationwide by telephone. One question asked was whether they agreed with this statement: "Some people say we should have a third major political party in this country in addition to the Democrats and Republicans." In this sample, 53% of the people asked responded, “Yes, we should have a third political party.”
The population for this sample survey appears to be
What is all adult residents of the U.S.
300
The purpose of the random assignment of treatments to subjects in an experiment
What is to create roughly equivalent groups before treatments are administered?
300
One group received a placebo. Why not just give this group no treatment at all?
Just thinking you are getting a treatment may have an effect on whether or not you stop smoking.
300
A random sample survey interviewed 3,800 U.S. adults nationwide by telephone. One question asked was whether they agreed with this statement: "Some people say we should have a third major political party in this country in addition to the Democrats and Republicans." In this sample, 53% of the people asked responded, “Yes, we should have a third political party.”
The news article that reports the poll results says, "The margin of error is plus or minus two percentage points." This means that
What is it is expected that between 51% and 55% of all adult Americans think they should have a third party.
400
The most important advantage of experiments over observational studies is that
What is experiments can give better evidence of causation?
400
Students in a large statistics class were randomly divided into two groups of 20 each. The first group took the midterm exam with soft music playing in the background while the second group took the exam with no music playing. The average scores of the two groups on the exam were compared.
Describe how random assignment could be done using slips of paper or technology. Be specific.
Label each student with a different integer from 1 to 40. Then, randomly generate 20 different integers from 1 to 40 ignoring repeats. The students with these labels will be assigned to the group that listens to soft music. The remaining 20 volunteers will have no music playing.
400
Sixty volunteers agree to have their reaction times tested in a driving simulator. Thirty of the drivers were randomly assigned to talk on the phone during the simulation, while the other drivers do not talk on the phone. During the simulation, a surprise event occurred which required each subject to step on the brake. The time it took them to react is recorded. The mean response time of those talking on the phone was 4.3 seconds. The mean response time of those not talking on a cell phone was 2.9 seconds.
Describe how you would randomly assign the participants to each treatment using a random number generator.
Label each volunteer with a different integer from 1 to 60, then, randomly generate 30 different integers from 1 to 60 ignoring repeats. The volunteers with these labels will be assigned to the group that talks on the cell phone while driving. The remaining 30 volunteers will not talk on the phone while driving.
500
A local community organizer is considering running for city council. She wants to measure her name recognition by doing a survey in the council district in which she intends to run. Which of the survey methods would produce unbiased results?
Gathering a random sample of eligible voters in her district, a pollster visits each of the voter’s homes, and asks the voter if he or she recognizes the organizer’s name?
500
Students in a large statistics class were randomly divided into two groups of 20 each. The first group took the midterm exam with soft music playing in the background while the second group took the exam with no music playing. The average scores of the two groups on the exam were compared.
Create an outline showing how the researchers could carry out a completely randomized design for this experiment
500
Sixty volunteers agree to have their reaction times tested in a driving simulator. Thirty of the drivers were randomly assigned to talk on the phone during the simulation, while the other drivers do not talk on the phone. During the simulation, a surprise event occurred which required each subject to step on the brake. The time it took them to react is recorded. The mean response time of those talking on the phone was 4.3 seconds. The mean response time of those not talking on a cell phone was 2.9 seconds.
Outline a completely randomized design for this experiment.
