STAT 211 End-term Practice Problems, Fall 2023 - Set 2 (Answer Keys)

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Statistics

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Jan 9, 2024

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Multiple Choice 5 points Answer Q.1 and Q.2 based on the following information. The histogram shown below represents 40 student scores on a statistics exam. Which of the following best describes the shape of the following data distribution? It's a right-skewed distribution. It's a left-skewed distribution. It's a symmetric distribution. It's a unimodal distribution. It's a bimodal distribution. 1
Multiple Choice 5 points What proportion of the scores are below 60? Give your answer to three decimal places. 0.125 0.225 0.325 0.425 0.525 2
Multiple Choice 5 points The boxplot below shows the amount of time it takes Melina to run a mile. A summary of that data is one of the options below. Select which data set summary best matches the boxplot. Mean=5.5 Std Dev=5 Median=6.5 Mean=5.5 Std Dev=8 Median=6.5 Mean=7.5 Std Dev=6 Median=7.5 Mean=5.5 Std Dev=4 Median=5.5 3
Mean=6 Std Dev=1 Median=5.5 Multiple Choice 5 points Answer Q.4-Q.7 based on the following information. Compute the median of the following dataset: 10, 12, 12, 14, 14, 16, 16, 20, 22, 23, 23, 24, 25, 25, 27, 30, 35 21 21.5 22 22.5 23 4
Multiple Choice 5 points Compute the ±rst quartile or, the 25-th percentile of the above dataset using the method discussed in class. 11 12 13 14 15 5 Multiple Choice 5 points Compute the third quartile or, the 75-th percentile of the above dataset using the method discussed in class. 23 24 25 26 27 6
Multiple Choice 5 points Compute the inter-quartile range of the above dataset. 10 10.5 11 11.5 12 7 Numeric 5 points Answer Q.8-Q.14 based on the following information. The probability that a ±rm will open a branch of±ce in Toronto is 0.7, that it will open one in Mexico City is 0.4, and that it will open an of±ce in either of the two cities is 0.8. Find the probability that the ±rm will open an of±ce in exactly one of the cities. 0.5 8
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