DeVry University, Keller Graduate School of Management: MATH 221 Week 1 quiz Answered_ Latest Dec 2021.
Question 1 2 / 2 pts (CO 1) A survey of 1272 pre-owned vehicle shoppers found that 8% bought the extended warranties. What is the population and what is the sample? Population: 1272 pre-owned vehicle shoppers; Sample: pre-owned vehicle shoppers Population: pre-owned vehicle shoppers; Sample: the 8% that bought extended warrantiesCorrect! Population: pre-owned vehicle shoppers; Sample: 1272 pre-owned vehicle shoppers Population: 1272 pre-owned vehicle shoppers; Sample: the 8% that bought extended warranties Question 2 2 / 2 pts (CO 1) A survey of all 35 employees at a small company finds that 89% of them like the recent changes to the company’s benefits. Is this percentage a parameter or a statistic and why? Statistic as it represents the population Statistic as it represents the sample Parameter as it represents the sampleorrect! Parameter as it represents the population Question 3 2 / 2 pts (CO 1) Classify the data of the heights of ladders produced by a tool company. QualitativeCorrect! Quantitative Statistics Classical Question 4 2 / 2 pts (CO 1) The data set that lists the runs scored at each of the weekend’s baseball games would be classified as what type of data? Intervalorrect! RatioOrdinal Nominal Question 5 2 / 2 pts (CO 1) A data set that includes the shows on a station during the day would be classified as what type of data? Ratio Intervalorrect! Nominal Ordinal Question 6 2 / 2 pts (CO 1) What type of data collection might be best to estimate the impact of exercise on longevity? Survey Observational Simulationorrect! Experiment Question 7 2 / 2 pts (CO 1) What type of data collection might be best to study the effect of a terror attack on a city’s electrical system? Correct! Simulation Observational Survey Experiment Question 8 0 / 2 pts(CO 1) You need to study the satisfaction of customers of a specific restaurant. You decide to randomly select one customer at each table. This would most closely describe which type of sampling technique? Random Stratified Systematicou Answered Cluster Question 9 2 / 2 pts (CO 2) Which of the following graphs would be a line graph? Correct! Question 10 2 / 2 pts (CO 1) In a normally distributed data set of how long customers stay in your store, the mean is 50.3 minutes and the standard deviation is 3.6 minutes. Within what range would you expect 95% of your customers to stay in your store? 39.5-61.1 48.5-52.1orrect! 43.1-57.5 46.7-53.9 Empirical rule Question 11 2 / 2 pts (CO 1) Which of the following graphs would be considered right skewed?Correct! Skewness Question 12 0 / 2 pts (CO 1) In a normally distributed data set with a mean of 22 and a standard deviation of 4.1, what percentage of the data would be between 17.9 and 26.1? 68% based on the Empirical Rule 95% based on the Empirical RuleYou Answered 68% based on the histogram 99.7% based on the Empirical Rule Empirical rule Question 13 0 / 2 pts (CO 1) Which of the following would be the standard deviation for this sample data set: 5, 7, 3, 9, 2, 4, 4, 6, 5, 9, 3? 2.36 5.18u Answered 2.59 2.25 Question 14 2 / 2 pts (CO 1) What would be the mean of this data set: 8, 9, 7, 244, 7, 1, 5, 3, 4? 75.016.0 5.5rrect! 32.0 Question 15 2 / 2 pts (CO 1) A city wants to know how many cars come to a complete stop at the stop signs in downtown. What type of study would be best suited to make this determination? Experimentalrrect! Observational Simulation Survey Question 16 0 / 2 pts (CO 1) To gather information on customer satisfaction, a researcher randomly selects four store locations and interviews all the customers at those selected stores. This sampling technique is called: You Answered Random Cluster Convenience Stratified Question 17 0 / 2 pts (CO 1) What is the standard deviation and its meaning given this population of customer ages? 45, 76, 30, 22, 51, 40, 63, 66, 41 16.5 which means that many of the ages will be around this value 17.5 which means that many of the ages will be around the square of this valueAnswered 17.5 which means that many of the ages will be within this value of the average age 16.5 which means that many of the ages will be within this value of the average ageQuestion 18 0 / 2 pts (CO 1) What is the mode of the following data set? 2, 3, 4, 5, 6, 7, 8 You Answered 2, 3, 4, 5, 6, 7, and 8 2 no mode 2, 4, 5, and 7 Score for this attempt: 36 out of 36 Submitted Jul 12 at 1:53am This attempt took 22 minutes. Question 1 2 / 2 pts(CO 1) A survey of 128 DeVry statistics students found that 83% read the announcements each week. What is the population and what is the sample? Population: all statistics students; Sample: 128 DeVry statistics students Population: DeVry statistics students; Sample: the 83% that read the announcements weeklyCorrect! Population: DeVry statistics students; Sample: 128 DeVry statistics students Population: all statistics students reading announcements weekly; Sample: the 128 DeVry statistics students Question 2 2 / 2 pts (CO 1) A survey of all 35 employees at a small company finds that 89% of them like the recent changes to the company’s benefits. Is this percentage a parameter or a statistic and why? Statistic as it represents the population Statistic as it represents the sampleorrect! Parameter as it represents the population Parameter as it represents the sample Question 3 2 / 2 pts (CO 1) Classify the data of the number of customers at a restaurant. Classicalorrect! Quantitative Qualitative Statistics Question 4 2 / 2 pts (CO 1) The data set that lists the number of performances for each Broadway show in 2017 would be classified as what type of data? Ordinal Intervalorrect! RatioNominal Question 5 2 / 2 pts (CO 1) A data set that includes the values given by customers to determine their level of satisfaction with their purchases. The scale used is very satisfied, somewhat satisfied, somewhat dissatisfied, and very dissatisfied. The data of the customer responses would be classified as what type of data? Correct! Ordinal Ratio Interval Nominal Question 6 2 / 2 pts (CO 1) What type of data collection might be best to estimate how many books individuals read in the past 6 months? ObservationalCorrect! Survey Experiment Simulation Question 7 2 / 2 pts (CO 1) What type of data collection might be best to study how voters might decide an upcoming ballot issue? Experiment ObservationalCorrect! Survey Simulation Question 8 2 / 2 pts(CO 1) You need to study the satisfaction of customers of a specific restaurant. You decide to randomly select one customer at each table. This would most closely describe which type of sampling technique? Correct! Stratified Random Systematic Cluster Question 9 2 / 2 pts (CO 2) Which of the following graphs would be a line graph? Correct! Question 10 2 / 2 pts (CO 1) In a normally distributed data set of how long customers stay in your store, the mean is 43.5 minutes and the standard deviation is 3.9 minutes. Within what range would you expect 95% of your customers to stay in your store? Correct! 35.7-51.3 39.6-47.4 42.5-44.5 31.8-55.2 Empirical rule Question 11 2 / 2 pts(CO 1) Which of the following graphs would be considered normally distributed? Correct! Skewness Question 12 2 / 2 pts (CO 1) In a normally distributed data set with a mean of 19 and a standard deviation of 2.6, what percentage of the data would be between 16.4 and 21.6? 68% based on the Chebychev’s TheoremCorrect! 68% based on the Empirical Rule 95% based on the Empirical Rule 95% based on the Chebychev’s Theorem Empirical rule Question 13 2 / 2 pts (CO 1) Which of the following would be the standard deviation for this sample data set: 5, 7, 3, 9, 2, 4, 4, 9, 5, 9, 3? 5.45orrect! 2.62 2.73 2.50 Question 14 2 / 2 pts (CO 1) What would be the mean of this data set: 8, 9, 7, 451, 7, 1, 5, 3, 4? 27.555.3 75.3orrect! 55.0 Question 15 2 / 2 pts (CO 1) A city wants to know how many cars come to a complete stop at the stop signs in downtown. What type of study would be best suited to make this determination? Simulation SurveyCorrect! Observational Experimental Question 16 2 / 2 pts (CO 1) To gather information on customer satisfaction, a researcher goes into several stores and interviews randomly selected customers. This sampling technique is called: Correct! Random Stratified Convenience Cluster Question 17 2 / 2 pts (CO 1) What is the standard deviation and its meaning in the sample of customer ages? 45, 76, 30, 22, 51, 40, 63, 66, 27 Correct! 18.8 which means that many of the ages will be within this value of the average age 17.8 which means that many of the ages will be around this value 17.8 which means that many of the ages will be within half of this value of the average age 18.8 which means that many of the ages will be around the square of this valueQuestion 18 2 / 2 pts (CO 1) What is the mode of the following data set? 2, 2, 3, 3, 3, 4, 4, 5, 5, 6, 7, 7, 7 2, 3, 4, 5, 6, and 7 3 7 ect! 3 and 7
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math 221 week 1
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co 1 a survey of 1272 pre owned vehicle shoppers found that 8 bought the extended warranties what is the population and what is the sample
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a survey of all 35 employees at a small
