Experimental design scenario practice

A highschol plans to offer two different SAT Prep courses this year: A traditional course classroom course and an online version. They want to determine which is more effective so only one version of the course will be offered in the future. A group pf 120 students have volunteered to take part in the experiment. If students are blocked by grade level ( Sophomores, Juniors and Seniors) and students within each block are randomly given a course which experimental design was used?

• completely randomized design

• randomized block design

• matched pair design

• Comparison design

You want to test whether a new cholesterol reducing drug works better than the current drug on the market. You have 500 volunteers that have a history of high cholesterol willing to participate in your study. You randomly choose participants that will take the new drug versus the current drug. Which experimental design was used?

• Completely randomized design

• randomized block design

• Matched pair design

• comparison design

Suppose researchers want to know how a new diet affects weight loss compared to a standard diet. They recruit 100 subjects, then group the subjects into 50 pairs based on their age and gender. A 25 year old male will be paired with a 25 year old male. A 50 year old female will be paired with a 50 year old female.Then, within each pair, one subject will randomly be assigned to follow the new diet for 30 days and the other subject will be assigned to follow the standard diet for 30 days. At the end of the 30 days, researchers will measure the total weight loss for each subject. Which experimental design was used for the experiment?

• completely randomized design

• randomized block design

• matched pairs design

• comparison design

A lumber company wants to estimate the proportion of trees in a large forest that are already to be cut down. They use an aerial map to divide the forest into 200 equal sized rectangles. Then they choose a random sample of 20 rectangles and examine every tree in the rectangles chosen. Which sampling method was used?

• simple random sample

• cluster sample

• stratified random sample

• systematic random sample

What is the average screen time of a high school student? To find out, you use a random generator to sample 100 students from each grade level. Which sampling method was used?

• simple random sample

• cluster sample

• stratified random sample

• systematic random sample

An advertisement said, " Should handgun control be tougher? Call 1-900-675-3788 to take the poll. Charge is 50 cents per minute." Over 90% of the people who called in said "Yes". Which method was used to find non -random sample?

• non- response

• cluster

• convenience

• voluntary response

We want to know how much the average student studies. We go the school library and ask the first 50 students we see about their study time. Which type of method was chosen to select this non-random sample.

• non response

• cluster

• convenience

• voluntary

An agency conducted a survey about unemployment by randomly dialing phone numbers until they gathered responses from 1000 adults in their state. In they survey, 19% of those responded said they were not currently employed. In reality, only 6% of the adults were not employed.

• response bias

• non response bias

• wording of the question

• undercoverage

A sample survey was given " In view of escalating environmental degradation and incipient resource depletion, would you favor economic incentives for recycling of resource intensive consumer goods?" Which type of bias describes this situation?

• undercoverage

• response bias

• non response

• wording of the question