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MATH 1213 1P Fall 2025 Intro to Statistics [Room CH230]

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Who was in your sample?

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What was your independent variable?

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A graduate student has chosen to use a

particular IQ test to measure intelligence in her study.  What scale of measurement would an IQ test

represent?

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A restaurant owner kept track of how often

people chose small, medium, or large beverages. What scale of measurement does ‘size

of beverage’

represent?

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Which of the following would be considered a construct?

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Which of the following best illustrates

a study with two treatment

groups?

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Imagine that an honours thesis student wanted to

compare students who participated in a weekly study group for statistics, to

students who did not participate in the weekly study group.  She found 40 statistics students willing to

participate in her study, and randomly assigned half to participate in the

study group while the rest did not. 

Then, she compared their final grades at the end of the semester to see

whether those who participated in the study group earned higher final grades.

In this example, the independent variable

was

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After you carried out your survey of households in the neighborhood, suppose you overheard someone referring to your survey as ‘random’.  However, you know that it was not a random sample because a random sample would have required that

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An important consideration when designing a

study is the way you assign your conditions. 

In on study of the impacts of certain kinds of seating in restaurants, some of the locations of a restaurant chain were assigned to a

condition that received new outdoor seating, while other locations did

not.  To determine which locations

actually got the new seating, the restaurant owner flipped a coin for each

location, and when the coin came up ‘heads’ that location received the new

seating, but when the coin came up ‘tails’ that location did not receive the

new seating.  By using this procedure,

the owner could be reasonably confident in the assumption that the restaurants

in the two conditions would vary similarly in size, age of facility, available

outdoor space, etc.  This assumption is a

safe one b

ecause

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Suppose you also found that 5%

of the households you surveyed experienced food insecurity at least once a

month.  If you inferred from this that 5%

of the neighborhood experienced food insecurity at least once a month, then the

entire neighborhood would be

your

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