Chapter 2 Flashcards
What is a frequency table?
What are raw frequency counts (or tallies)?
How are relative frequencies different from raw frequencies?
What is a bar graph and how does it differ from a histogram?
What is the difference between relative frequency and cumulative relative frequency?
Explain why the concept of an interval does not pertain to qualitative variables.
How do the real limits of an interval relate to the interval width and interval midpoint?
What are the score limits of an interval?
What is a sampling experiment?
What is the outcome of a sampling experiment?
Is an event different from an outcome? Explain.
How does a proportion relate to probability?
What does it mean to say that two events are mutually exclusive?
What does it mean to say that two events are independent?
Give an example of a conditional probability.
Is there a difference between a relative frequency distribution and a probability distribution? Please explain.
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A frequency table can be thought of as a probability distribution.
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A frequency table can be thought of as a probability density function.
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A value of 19.4999 falls in an interval with score limits of 20–29.
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The probability of drawing a face card from a deck of 52 cards is .2308.
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The probability of drawing a red ace from a deck of 52 cards is .0385.
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The probability of drawing the ace of spades or the ace of hearts from a deck of 52 cards is .0385.
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For large samples with many different values of the variable, we should have a small number of intervals when constructing a frequency table.
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In 50 flips of a fair coin, it came up heads 28 times. Therefore, the probability of coming up heads is .56.
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If the interval width is 10, then 35–44 is a possible interval for the lowest score limits.
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In a frequency table for a qualitative variable, values of the variable should be listed from largest to smallest.
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The only difference between a bar graph and a histogram is the labeling of the y-axis.
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The range of 100 scores is 50; therefore, 20 would be a reasonable interval width.
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A collection of reaction times ranges from .936 seconds to 2.301 seconds. Therefore, a reasonable interval width would be 20 milliseconds.
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