AS U1 Review

A theme park employee wants to survey customers about their happiness with average line length for rides at the park. The employee goes to the three most popular rides and randomly surveys some people from each ride's line. Which type of bias is most likely in this scenario?

• Sampling bias

• Response bias

• Nonresponse bias

• Space Mountain Bias

In an office building, employees are seated in groups of 4 called pods. There are 30 pods in the building. The manager decides to take a random sample of one employee per pod. Does this method represent a simple random sample?

• No, since each employee does not have the same chance of being selected.

• Yes, since each employee has the same chance of being selected.

• Yes, since each group of size 30 has the same chance of being selected.

• No, since each group of size 30 does not have the same chance of being selected.

A herbalist is testing the effective of tea on stress levels. The herbalist will randomly assign patients to drink a cup of tea and rate their stress levels after one hour. The tea will be made from either green or black tea leaves, and will also be brewed at one of the following strengths: weak, moderate, strong. How many factors does this experiment have?

• 1

• 2

• 5

• 6

At a factory, a quality control manager takes a random sample of widgets. At the end of each hour over the course of a day, 10 widgets produced in that hour are randomly selected. What type of sampling method is described here?

• Simple random sample

• Stratified random sample

• Cluster random sample

• Systematic random sample

An agriculture company is testing whether a new type of soil can help vegetables grow more. Ten broccoli seeds are randomly assigned to grow in the old soil while ten others are randomly assigned to go grow in the new soil. This is repeated for corn, bell peppers, and zucchini as well, with the new and old averages being compared for each plant type. What type of study was done?

• Observational study

• Completely randomized design

• Randomized block design

• Matched pairs

Two new powdered electrolyte mixes are being tested to see if either of them are effective at preventing the number of cramps runners get after a long run. Two different mixes (A or B) will be tested at two different amounts (1/2 packet or full packet mixed into water). How many treatments should be used in this experiment?

• 2

• 4

• 5

• 6

At Paige's Book Store, a bookstore in Statsland, customers are randomly sampled over the course of a month and surveyed as to how many books they read per month, on average. To which population can the results of the survey be generalized?

• All people who read books

• All customers of this book store

• All people who live in Statsland

• All people who shop in book stores

Is the following method of random assignment likely to yield comparable treatment groups?

In a classroom with 20 students, a teacher wants to assess the effect of desk type on test scores. Starting at the front, the teacher flips a coin. If heads, that student gets a new desk. If tails, that students gets an old desk. Repeat for all students until one group is full and then the rest of the students get placed in the other group.

• Yes

• No