# We have examined 10 species of snakes in the family Colubridae, and 10 species of snakes in the family Pythonidae. We have examined 10 species of snakes in the family Colubridae, and 10 species of snakes in the family Pythonidae. We recorded how many vertebrae each species has, and we are curious about whether the Colubridae or Pythonidae in general have more vertebrae. Each species represents one data point.

Which study design is this?

Question 1 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 2 (1 point)

We took soil samples from 28 mines in northern Minnesota. For each mine we recorded whether there were unhealthy levels of a heavy metal in the soil. We are interested in the proportion of mines in northern Minnesota which are safe.

Which study design is this?

Question 2 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 3 (1 point)

96 people were randomly interviewed on the street. Each was asked the following questions: do they have a computer in their home, and whether they have a reclining chair.

Which study design is this?

Question 3 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 4 (1 point)

We write a 50-question quiz on US history. We collect a sample of people, ask them if they have a college degree or not, and then record the number of questions answered correctly on the quiz. We want to know whether level of education explains performance on the test.

Which study design is this?

Question 4 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 5 (1 point)

Patients at a back clinic are given one of two therapies for back pain, and later report whether their condition has improved or not improved.

Which study design is this?

Question 5 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 6 (1 point)

We survey 100 men over age 50, and sample their blood pressure. We are interested in the distribution of blood pressure readings among our subjects.

Which study design is this?

Question 6 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 7 (1 point)

We want to know whether girls or boys can do more pushups. We observe gym class in a junior high school, and record the number of pushups that 23 boys and 20 girls can manage.

Which study design is this?

Question 7 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 8 (1 point)

We are curious about whether shirt size (defined as S, M, L, XL) is related to hat size (S, M, L, XL). We collect data from 89 people in a hat shop and try to answer our question.

Which study design is this?

Question 8 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 9 (1 point)

We visit 10 families, and record the number of children in each. We then calculate the average number of children per family.

Which study design is this?

Question 9 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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#### Question 10 (1 point)

We census fish in 10 ponds, and record whether or not there are sunfish in each pond.

Which study design is this?

Question 10 options:

 A single quantitative variable design A design where we have one categorical and one quantitative variable and would calculate two means or histograms from two sets of individuals A one categorical variable design (includes one proportion situations) A two-way table design (includes two proportion situations)

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