Mathematics > EXAM > DeVry University_MATH221 | Statistics for decision making week 3 quiz chapters 1,2,& 3 (All)

Statistics for decision making week 3 quiz chapters 1,2,& 3 Question 1 2 / 2 pts (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? Question 2 0 / 2 pts (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? Question 3 2 / 2 pts (CO 1) Classify the data of the heights of ladders produced by a tool company. Question 4 2 / 2 pts (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? Question 5 2 / 2 pts (CO 1) A data set that includes the values given by customers to determine their level of satisfaction with their purchases. The scale used is very satisfied, somewhat satisfied, somewhat dissatisfied, and very dissatisfied. The data of the customer responses would be classified as what type of data? Question 6 2 / 2 pts (CO 1) What type of data collection might be best to estimate how many books individuals read in the past 6 months? Question 7 0 / 2 pts (CO 1) What type of data collection might be best to study how voters might decide an upcoming ballot issue? Question 8 2 / 2 pts (CO 1) You need to study the satisfaction of customers of a specific restaurant. You decide to randomly select a few tables and talk to everyone at those selected tables. This would most closely describe which type of sampling technique? Question 9 0 / 2 pts (CO 2) Which of the following graphs would be a dot plot? Question 10 0 / 2 pts (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 1.9minutes . Within what range would you expect 95% of your customers to stay in your store? Question 11 2 / 2 pts (CO 1) Which of the following graphs would be considered normally distributed? Question 12 2 / 2 pts (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 13 2 / 2 pts (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? Question 14 2 / 2 pts (CO 1) What would be the mean of this data set: 8, 9, 7, 508, 7, 1, 5, 3, 4? Correct! Question 15 2 / 2 pts (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? Question 16 2 / 2 pts (CO 1) To gather information on customer satisfaction, a researcher goes into several stores and interviews randomly selected customers. This sampling technique is called: Question 17 2 / 2 pts (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 18 2 / 2 pts (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 19 2 / 2 pts (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 20 2 / 2 pts (CO 3) Consider the table below Response (number of cats owned) Frequency None 659 One 329 Two 52 Three 13 Four or more 8 What is the probability that the next person asked has only two cats? Question 21 0 / 2 pts (CO 3) Consider the table below Age Group Frequency 18-29 9831 30-39 7845 40-49 6869 50-59 6323 60-69 5410 70 and over 5279 What is the probability that the next person chosen will be in the 18-29 or 30-39 age groups? See text page 136 Question 22 0 / 2 pts (CO 3) 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? Question 23 0 / 2 pts (CO 3) Consider the table below. Age Group Frequency 18-29 9831 30-39 7845 40-49 6869 50-59 6323 60-69 5410 70 and over 5279 What is P(40-59’)? Question 24 0 / 2 pts (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 on the first day and lose money on the next two days? Question 25 2 / 2 pts (CO 3) Consider the table below. Profit Loss Total Urban location 50 38 88 Rural location 61 84 125 Total 111 132 243 Find the probability that a randomly selected location is going to be profitable, given that it is in an urban location. Question 26 2 / 2 pts (CO 3) Consider the table below. Production location Correct Defective Total East 258 31 289 West 572 106 678 North 755 94 849 South 491 74 565 Total 2076 305 2381 Find the probability that a randomly selected product is defective, given that it is from the East production facility. 12.8% 12.1% 87.2% Question 27 0 / 2 pts (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 be considered: Question 28 2 / 2 pts (CO 3) Classify these events. Some businesses paint the outside of their buildings red while some businesses offer employees health benefits. These events would be considered: Question 29 0 / 2 pts (CO 3) In a survey of 320 customers, 84 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 30 0 / 2 pts (CO 3) Randomly select a customer that takes the bus to our store. Randomly select a customer that is a teenager. Are these events mutually exclusive? [Show More]

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