## MATH 221 Week 3 Quiz (Fall 2018)

**Question**: (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?**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?**Question**: (CO 1) Classify the data of the number of customers at a restaurant.**Question**: (CO 1) The data set that lists a company’s competitors and their locations would be classified as what type of data?**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?**Question**: (CO 1) What type of data collection might be best to estimate the impact of exercise on longevity?**Question**: (CO 1) What type of data collection might be best to study the effect of car crashes on humans?**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?**Question**: (CO 2) Which of the following graphs would be a line graph?**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?**Question**: (CO 1) Which of the following graphs would be considered right skewed?**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?**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?**Question**: (CO 1) What would be the mean of this data set: 8, 9, 7, 508, 7, 1, 5, 3, 4?**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?**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:**Question**: (CO 1) What is the standard deviation and its meaning in the sample of customer ages? 48, 76, 30, 39, 51, 40, 63, 66, 27**Question**: (CO 3) A random number generator is used to select a number from 1 to 100. What is the probability of selecting an odd number?**Question**: (CO 3) What is the sample space to responses to a Question: whose answers are Yes or No, along with a Question: on location with possible answers of North, South, East, or West?**Question**: (CO 3) Consider the table below: ……….What is the probability that the next person asked has only one cat?**Question**: (CO 3) Consider the table below: ………..What is the probability that the next person chosen will … in the 18-29 or 30-39 age groups?**Question**: (CO 3) Based on the CEO’s perception, a company estimates that a new product will … purchased by 32% of current customers. This is an example of which type of probability?**Question**: (CO 3) Consider the table below: ………. What is P(over 60’)?**Question**: (CO 3) 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?**Question**: (CO 3) Consider the table below: ……… Find the probability that a randomly selected location is going to be profitable, given that it is in a rural location.**Question**: (CO 3) Consider the table below: ……… Find the probability that a randomly selected product is from the West, given that it is defective.**Question**: (CO 3) Classify these events. Selecting a king from a deck of cards, replacing it and selecting a queen from the same deck. These events would … considered:**Question**: (CO 3) Classify these events. Some customers purchase lots of items and some customers use shopping carts. These events would … considered:**Question**: (CO 3) 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?**Question**: (CO 3) Randomly select a customer that lives in a retirement home. Randomly select a customer that is a teenager. Are these events mutually exclusive?

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