stats 10 quiz 5

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Feb 20, 2024

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2/20/22, 12:01 PM Quiz 5: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/780949 1/8 Quiz 5 Due Feb 11 at 11:59pm Points 10 Questions 10 Time Limit None Instructions Attempt History Attempt Time Score LATEST Attempt 1 13 minutes 10 out of 10 Score for this quiz: 10 out of 10 Submitted Feb 11 at 12:36pm This attempt took 13 minutes. General Quiz Information The purpose of this quiz is to help you check your understanding of Week 6 materials . The quiz is not timed and it's open book/notes. You must complete and submit your answers for each quiz by the due date. Please work on the quiz independently. If you experience a technical problem that interferes with your ability to complete a quiz during the specified time, contact your instructor as soon as possible—you don't have to wait until the quiz has closed 1 / 1 pts Question 1 Which of the following is an example of a disjoint/mutually exclusive event? The selected person only drinks water; the selected person drinks coffee.
2/20/22, 12:01 PM Quiz 5: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/780949 2/8 The selected students is a biology major; the selected student is taking a statistics class. The selected student works off campus; the selected student does not have a job. Correct! Correct! The selected student is an English major; the selected student speaks French. Your answer is correct. 1 / 1 pts Question 2 Suppose that for American households with pets, 45% owned a dog, 34% owned a cat, and 10% owned a bird. Assume that pet ownership is mutually exclusive. Suppose we select three households randomly, what is the probability that at least one of the three randomly selected households own a bird? (Round to the nearest hundredth) 0.73 0.08 0.92 0.27 Correct! Correct!
2/20/22, 12:01 PM Quiz 5: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/780949 3/8 1 / 1 pts Question 3 Suppose for two events A and B, the probability of event A occurring is 0.2 and the probability of both events occurring is 0.18. Suppose A and B are independent, what is the probability of event B occurring? 0.16 0.36 0.9 Correct! Correct! Cannot be determined 1 / 1 pts Question 4 Which of the following statements is true about the "law of large numbers" (LLN)? If an experiment is repeated a large number of times, the empirical probability will be consistently different from the theoretical probability. If you repeat a random experiment many, many times, your outcomes should be a unique value that is different from the theoretical average. If you simulate an experiment that is designed correctly, the empirical probability will always be the same as the theoretical probability that is expected.
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2/20/22, 12:01 PM Quiz 5: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/780949 4/8 If you repeat a random experiment many, many times, the empirical probability should on average approach the theoretical value as the number of trials increase. Correct! Correct! 1 / 1 pts Question 5 When events A and B are said to be independent, what does that mean? Events A and B are complements. Events A and B are equally likely to occur. Knowledge that event B occurred does not change the probability of event A occurring. Correct! Correct! Knowledge that event B occurred changes the probability of event A occurring. 1 / 1 pts Question 6 A yes/no test has 16 questions. Each question has two choices (yes or no), and only one choice is correct. Which of the following methods is a valid simulation of a student who guesses randomly on each question? (Note: there might be more than one valid method.)
2/20/22, 12:01 PM Quiz 5: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/780949 5/8 A die is rolled 16 times. Each roll represents one question on the test. If the die lands on a 1, the answer is correct; otherwise the answer is incorrect. A die is rolled 16 times. Each roll represents one question on the test. If the die lands on an even number, the answer is correct. If the die lands on an odd number, the answer is incorrect. Correct! Correct! A die is rolled 16 times. Each roll represents one question on the test. If the die lands on a 1 or 3, the answer is correct; If the die lands on a 2 or 4, the answer is incorrect. A coin is flipped 16 times. Each flip represents one question on the test. If the coin lands on heads, the answer is correct. If the coin lands on tails, the answer is incorrect. Correct! Correct! 1 / 1 pts Question 7 Refer to the histograms, which show the relative frequencies from experiments in which a fair six-sided die was rolled. The results were from 40 rolls, 300 rolls, and 1,000 rolls. Which histogram do you think was for 1,000 rolls?
2/20/22, 12:01 PM Quiz 5: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/780949 6/8 Correct! Correct! No answer text provided. 1 / 1 pts Question 8 What determines the exact shape of a Normal distribution? The value of the mean The values of the mean and the standard deviation Correct! Correct! The value of the median and IQR The value of the standard deviation 1 / 1 pts Question 9
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2/20/22, 12:01 PM Quiz 5: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/780949 7/8 A student's music playlist contains songs from five genres. Suppose the playlist was set to shuffle and the following table shows the probability for the genre of the first song played. Does the table represent a probability distribution? Genre Probability Rock 0.302 Pop 0.290 Country 0.203 Jazz 0.123 Classical 0.090 Yes No Correct! Correct! Cannot be determined 1 / 1 pts Question 10 Which of the following is true about a continuous random variable? (Select all that apply) The variable can only take certain values The probability is measured by area under the curve Correct! Correct! The sum of individual probabilities is equal to 1 The probability distribution is bell shaped
2/20/22, 12:01 PM Quiz 5: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/780949 8/8 The probability of any single value is 0 Correct! Correct! Quiz Score: 10 out of 10

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