MATH 221 Week 3 Quiz

1. Question: (CO 1) A survey of 385 people who like wild sweaters found that 74% had a wild holiday sweater. 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 the number of customers at a restaurant. 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 number of products that were produced within each hour by a company would be classified as what type of data? 6. Question: (CO 1) What type of data collection might be best to estimate the impact of exercise on longevity? 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 decide to order food and talk to those customers sitting next to you. 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 31.7 minutes and the standard deviation is 1.9 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 normally distributed? 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 17.9 and 26.1? 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, 451, 7, 1, 5, 3, 4? 15. Question: (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? 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, 51, 40, 63, 66, 41 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 odd number? 19. Question: (CO 2) What is the sample space of rolling two four-sided die? 20. Question: (CO 2) Consider the table below. What is the probability that the next person asked has four or more cats? 21. Question: (CO 2) Consider the table below. What is the probability that the next person chosen will be in the 18-29 or 30-39 age groups? 22. Question: (CO 2) Based on the CEO’s perception, a company estimates that a new product will be purchased by 32% of current customers. 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 next two days? 25. Question: (CO 2) Consider the table below. Find the probability that a randomly selected location is in a rural location, given that it is profitable. 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 another king from the same deck. These events would be considered: 28. Question: (CO 2) Classify these events. A study found that people who suffer from stress are more likely to have health issues. 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?