stats10 quiz 2

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2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 1/10 Quiz 2 Due Jan 14 at 11:59pm Points 12 Questions 12 Available after Jan 14 at 8am Time Limit None Instructions Attempt History Attempt Time Score LATEST Attempt 1 23 minutes 12 out of 12 Score for this quiz: 12 out of 12 Submitted Jan 14 at 12:39pm This attempt took 23 minutes. General Quiz Information The purpose of this quiz is to help you check your understanding of Week 2 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 The dot plot below shows the speeds of a sample of 50 cars.
2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 2/10 What proportion of the drivers was driving more than the speed limit of 60 miles per hour? 9 0.18 Correct! Correct! 0.60 11 1 / 1 pts Question 2 Which of the following statements best describes the typical value for the histogram shown below. Since the distribution is bimodal, typical value does not exist. Since the distribution is unimodal, the typical value is 40 because it is the middle point of the distribution. The typical value is 40 because it is the average of 20 and 60.
2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 3/10 Since the distribution is bimodal, there could be two typical values - one is about 20 and the other is about 60. Correct! Correct! 1 / 1 pts Question 3 An instructor is interested in finding out how much time (in hours) her students spent on the exam preparation. The data is displayed in the following histogram. Which of the following statements is correct about the histogram? (Select all that apply) The numbers on the horizontal axis represent the number of observations (frequency) in each interval. The sum of the height of all the bars equals to the total number of students in the data set. Correct! Correct! Less than 50% of the students spent at least 6 hours studying the exam
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2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 4/10 The gap in between 4 to 6 indicates that there is no observation in this interval Correct! Correct! The bin width of the histogram is equal to 1. 1 / 1 pts Question 4 A survey asked people to report the number of phone calls they made daily. Below is the frequency table that shows the survey results. Suppose you were to make a histogram using the table above. Which of the following would be true about the histogram? The highest bar in the histogram is located in interval 1-4 Correct! Correct! The bin width of the histogram is 5 The histogram is right-skewed Correct! Correct! The will be 5 bars in the histogram Correct! Correct! Your answer is correct.
2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 5/10 1 / 1 pts Question 5 In the following histogram, what can you conclude about the bin width? The bin width is too [large ]. We are given [too little ] detail of the distribution. 1 / 1 pts Question 6 The following frequency table reports data on 500 book reviews of a novel. Construct a pie chart representing the given data set.
2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 6/10 Correct! Correct! 1 / 1 pts Question 7 Which of the following statements about bar graphs is TRUE? It sometimes doesn't matter in which order you place the bars representing different categories. The width of the bars in a bar plot has no numerical meaning. There can be gaps between the bars. All of these are true for bar graphs. Correct! Correct! 1 / 1 pts Question 8 Which statement below is NOT supported by the following bar chart?
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2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 7/10 Not many people, in general, always wear sunscreen. More than 50% of females never wear sunscreen. Correct! Correct! More females wear sunscreen than males. More than 50% of males never wear sunscreen. 1 / 1 pts Question 9 A statistics student is interested in determining the average time it takes a visitor to find a parking spot at UCLA. The student observed 20 visitors and recorded how long it took each of them to find a parking spot. Which of the following types of graphs should NOT be used to display data concerning the visitors' parking times? [pie chart ] 1 / 1 pts Question 10 An instructor collected data on the number of times that students in a statistics class log onto an educational website during a day.
2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 8/10 The distribution of the data tends to be unimodal and negatively skewed with some potential outliers. Which of the following graphs matches the description? Correct! Correct! 1 / 1 pts Question 11 Administrators at a college compare SAT scores for admitted students in different majors. It was found that the typical SAT score for engineering students is higher than other majors. What does this statement mean? There is more variation in the SAT score for engineering students.
2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 9/10 If you are an engineering student, you definitely scored higher on SAT than students in other majors. The center of the distribution of SAT scores for engineering students is more than the center of the distribution for those in other majors. Correct! Correct! The distribution of SAT scores for engineering students is more symmetric. 1 / 1 pts Question 12 Which of the following is the best description of the data used to generate this histogram? (Note that the horizontal axis has no scale, so you will make your choice based solely upon the histogram's shape.) Results of rolling a six-sided die 1,000 times Marathon finishing times of 1,000 male and female runners Correct! Correct! Blood pressure of 1,000 female adults
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2/20/22, 12:01 PM Quiz 2: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/764711 10/10 Prices of 1,000 homes in San Francisco Your answer is correct. Quiz Score: 12 out of 12

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