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MATH 1280-01 Introduction to Statistics - AY2025-T5
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The time between customer arrivals at a service center follows an exponential distribution with a rate parameter of 0.1 customers per minute. What is the 80th percentile of the time between customer arrivals?
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A restaurant owner selects customers at random from their loyalty program database for a satisfaction survey. The selected customers are the:
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Which term describes the entire group that a researcher is interested in studying?
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What is the typical criterion for identifying outliers using a box plot?
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If the population standard deviation is 10 and the sample size is 25, then the standard error of the mean will be 2.
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The Hypergeometric distribution is most appropriate for modeling the number of heads obtained from 10 flips of a fair coin.
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Given a data set of 15 ordered values, the third quartile (Q3) would be the median of which group?
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The variance of a geometric distribution with probability of success p is given by the formula (1-p)/p^2.
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For the data set: 3, 5, 8, 10, 12, what is the lower quartile (Q1)?
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The probability of getting a number greater than 4 when a dice is thrown once is 1/3.
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