Statistics final exam sharpeners Q & A (2021)

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Question 1 of 25 1.0/ 1.0 Points Which of the following correctly describes the relationship between a sample and a population? A.A population and a sample are not related. B.A population is a grou... p of samples that may or may not be included in a study C.A sample is a group of subjects selected from a population to be studied. D.A sample is a group of populations that are subject to observation. Answer Key: C Part 2 of 9 - 2.0/ 2.0 Points Question 2 of 25 1.0/ 1.0 Points A gumball machine contains 300 grape flavored balls, 400 cherry flavored balls, and 500 lemon flavored balls. What is the probability of getting 1 grape ball, 1 cherry ball, and 1 lemon ball if each ball was removed and then replaced before choosing the next from the machine? A.0.0264 B.0.0531 C.0.0347 D.0.0482 Answer Key: C Question 3 of 25 1.0/ 1.0 Points A furniture manufacturer offers bookcases in 5 different sizes and 3 different colors. If every color is available in every size, then the total number of different bookcases is A.5 B.8 C.15 D.30 Answer Key: C Part 3 of 9 - 3.0/ 3.0 Points Question 4 of 25 1.0/ 1.0 Points Find the variance of the following probability distribution. X P(X) 1 0.10 2 0.35 3 0.10 4 0.15 5 0.30 A.1.44 B.2.06 C.1.76 D.1.2 Answer Key: B Question 5 of 25 1.0/ 1.0 Points Find the variance of the following probability distribution. X P(X) 1 0.20 2 0.35 3 0.10 4 0.25 5 0.10 A.1.83 B.1.31 C.1.25 D.1.71 Answer Key: D Question 6 of 25 1.0/ 1.0 Points In a small town, 60% of the households have dogs. If 5 households are randomly selected, what is the probability that at least 4 of them have dogs? A.0.337 B.0.8 C.3 D.0.259 Answer [Show More]

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