MATH 221 Week 3 Quiz

1. Question: (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? 2. Question: (CO 1) The measurements of 100 products from the assembly line show that 99% are correct. Is this percentage a parameter or a statistic and why? 3. Question: (CO 1) Classify the data of all the political parties in the world. 4. Question: (CO 1) The data set that lists the temperatures in Albany, NY each day in the month of February 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) A data set that includes the shows on a station during the day would be classified as what type of data? 7. Question: (CO 1) What type of data collection might be best to study how many books students bring into the media center during finals week? 8. Question: (CO 1) You need to study the satisfaction of customers of a specific restaurant. You ask every 10 customer as they leave after their meal. This would most closely describe which type of sampling technique? 9. Question: (CO 1) Which of the following graphs would be a histogram? 10. Question: (CO 1) In a normally distributed data set of how long customers stay in your store, the mean is 44.8 minutes and the standard deviation is 2.6 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 right skewed? 12. Question: (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 13.8 and 30.2? 13. Question: (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? 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 political campaign wants to know the public’s reaction to their candidates latest policy initiative. What type of study would be best suited to make this determination? 16. Question: (CO 1) To gather information on customer satisfaction, a researcher goes into each store and interviews six randomly selected customers at each store. This sampling technique is called: 17. Question: (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 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 to responses to a question whose answers are Up, Down, Left, or Right along with a question on preference between Blue and Red? 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 30-39 or 40-49 age groups? 22. Question: (CO 2) When children roll a die for a game, their probability of rolling a 5 is 17%. This is an example of which type of probability? 23. Question: (CO 2) Consider the table below. What is P(40-59’)? 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 all three 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 from the West, given that it is defective. 27. Question: (CO 2) Classify these events. Selecting a king from a deck of cards, replacing it and selecting a queen from the same deck. These events would be considered: 28. Question: (CO 2) Classify these events. Some customers purchase lots of items and some customers use shopping carts. These events would be considered: 29. Question: (CO 2) In a survey of 352 customers, 81 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 lives in a retirement home. Randomly select a customer that is a teenager. Are these events mutually exclusive?