MATH 221 Week 3 Quiz

1. Question: (CO 1) Among 500 people at the concert, a survey of 35 found 28% found it too loud. What is the population and what is the sample? 2. Question: (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? 3. Question: (CO 1) Classify the data of the number of customers at a restaurant. 4. Question: (CO 1) The data set that lists a company’s competitors and their locations would be classified as what type of data? 5. Question: (CO 1) A data set that includes the shows on a station during the day would be classified as what type of data? 6. Question: (CO 1) What type of data collection might be best to estimate how many books individuals read in the past 6 months? 7. Question: (CO 1) What type of data collection might be best to study how voters might decide an upcoming ballot issue? 8. Question: (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? 9. Question: (CO 1) Which of the following graphs would be a Pareto chart? 10. Question: (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? 11. Question: (CO 1) Which of the following graphs would be considered left skewed? 12. Question: (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? 13. Question: (CO 1) Which of the following would be the standard deviation for this sample data set: 5, 7, 6, 9, 6, 4, 4, 6, 5, 9, 3? 14. Question: (CO 1) What would be the mean of this data set: 8, 9, 7, 508, 7, 1, 5, 8, 1? 15. Question: (CO 1) A researcher wants to study the effects of playing video games 247 for a week. What type of study would be best suited to make this determination? 16. Question: (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: 17. Question: (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 18. Question: (CO 2) A random selection from a deck of cards selects one card. What is the probability of selecting a spade? 19. Question: (CO 2) What is the sample space of flipping three coins, where H=heads, and T=tails? 20. Question: (CO 2) Consider the table below. What is the probability that the next person asked has only one cat? 21. Question: (CO 2) Consider the table below. What is the probability that the next person chosen will be in the 40-49 or 50-59 age groups? 22. Question: (CO 2) According to company records, the probability that a dishwasher will need repairs during its first six years is 0.09. This is an example of which type of probability? 23. Question: (CO 2) Consider the table below. What is P(30-49’)? 24. Question: (CO 2) You are selling your product at a three-day event. Each day, there is a 60% chance that you will make money. What is the probability that you will make money on the first day and lose money on the next two days? 25. Question: (CO 2) Consider the table below. Find the probability that a randomly selected location is in an urban location, given that it is operating a loss. 26. Question: (CO 2) Consider the table below. Find the probability that a randomly selected product is defective, given that it is from the East production facility. 27. Question: (CO 2) Classify these events. Selecting a king from a deck of cards, replacing it and selecting another king from the same deck. These events would be considered: 28. Question: (CO 2) Classify these events. Some businesses have large stores and some businesses have large parking lots. These events would be considered: 29. Question: (CO 2) In a survey of 320 customers, 58 say that service is poor. You select two customers without replacement to get more information on their satisfaction. What is the probability that both say service is poor? 30. Question: (CO 2) Randomly select a customer that takes the bus to our store. Randomly select a customer that drove to our store. Are these events mutually exclusive?