Statistics Experiment

• Treatment (+) row = 50

  Treatment (-) row = 50

• Treatment (+) row = 25

  Treatment (-) row = 75

• Treatment (+) row = 75

  Treatment (-) row = 25

• Treatment (+) row = 100

  Treatment (-) row = 0

• Treatment (+) row = 0

  Treatment (-) row = 200

• 1.33

• 2.67

• 4.00

• 5.33

What is the odds ratio (OR) for the data in the contingency table shown?

• 1.71

• 0.58

• 1.28

• 0.78

What is the relative risk (RR) for the data in the contingency table shown?

• 1.71

• 0.58

• 1.28

• 0.78

Linda wanted to know if it is easier for students to memorize a list of common three-letter words (such as fly, pen, and red) than a list of three-letter nonsense words (such as vir, zop, and twq). She randomly selected 𝟐𝟖 students from all tenth graders in her district. She put 𝟏𝟒 blue and 𝟏𝟒 red chips in a jar, and without looking, each student chose a chip. Those with red chips were given the list of common words; those with blue chips were given the list of nonsense words. She gave all students one minute to memorize their lists. After the minute, she collected the lists and asked the students to write down all the words that they could remember. She recorded the number of correct words recalled.

What type of study is described?

• Survey

• Experimental Study

• Observational Study

Match each of the options to the type of study. The volunteers are split into 2 groups by a random process. One group will read the article and the other will not. Everyone will then look at the city pictures and the diameter of their pupil will be measured while they look at the pictures.

• Survey

• Observational study

• Experimental study

A teacher puts all her students' names in hat, then selects 3 names from the hat. These students will take a standardized test.

• Convenience

• Systematic

• Stratified

• Simple Random

A market research company wishes to find out whether the population of students at a university prefers Starbucks or Dunkin Donuts. A random sample of students is selected, and each student is asked first to try both but the order they try them is randomly decided with a coin toss (heads: Starbucks, then Dunkin. tails: vice versa). They then indicate which brand they prefer. This is an example of

• completely randomized experiment

• an observational study

• a blocked experiment

• matched pairs experiment

In order to perform an experiment using 60 members of a gym, I first divide the list of members into men and women because I feel that the results will be different based on gender. I then randomly choose 30 men and 30 women. I assign half of the men to the treatment group and half to the control group. I repeat this procedure with the women. This is an example of a:

• completely randomized experiment

• blocked experiment

• matched pairs experiment

• observational study