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) In asking all 349 second graders in a school district, it is found that on average, these second graders have 2.5 pets. Is this number 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 years in which your hometown team won championships would be classified as what type of data: 6. Question: (CO 1) What type of data collection might be best to estimate whether a new medicine is more effective in curing the common cold than aspirin? 7. Question: (CO 1) What type of data collection might be best to study the effect of a terror attack on a city’s electrical system? 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 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 right 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, 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, 244, 7, 1, 5, 3, 4? 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 the local store and interviews six randomly selected customers. 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, 24, 40, 63, 66, 27 18. Question: (CO 2) A random number generator is used to select a number from 1 to 100. What is the probability of selecting an even number? 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 no cats? 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(50-69’)? 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 second day, and make money on the third? 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 South production facility. 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 takes the bus to our store. Randomly select a customer that drove to our store. Are these events mutually exclusive?