MATH 221 STATISTICS FOR DECISION MAKING WEEK 3 QUIZ / 2020
DeVry MATH 221 Week 3 Quiz Answers (2020)
(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?
(CO 1) A survey of all 35 employees at a small company finds that 89% of them like the recent changes to the company’s benefits. Is this percentage a parameter or a statistic and why?
(CO 1) Classify the data of all the political parties in the world.
(CO 1) The data set that lists the runs scored at each of the weekend’s baseball games would be classified as what type of data?
(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?
(CO 1) What type of data collection might be best to estimate the impact of exercise on longevity?
(CO 1) What type of data collection might be best to study how voters might decide an upcoming ballot issue?
(CO 1) You need to study the satisfaction of customers of a specific restaurant. You ask every 10th customer as they leave after their meal. This would most closely describe which type of sampling technique?
(CO 1) Which of the following graphs would be a dot plot?
(CO 1) In a normally distributed data set of how long customers stay in your store, the mean is 43.5 minutes and the standard deviation is 3.9 minutes. Within what range would you expect 95% of your customers to stay in your store?
(CO 1) Which of the following graphs would be considered normally distributed?
(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?
(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?
(CO 1) What would be the mean of this data set: 8, 9, 7, 244, 7, 1, 5, 3, 4?
(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?
(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:
(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
(CO 2) A random selection from a deck of cards selects one card. What is the probability of selecting an ace?
(CO 2) What is the sample space of rolling two four-sided die?
(CO 2) Consider the table below
Response (number of cats owned)
|
Frequency
|
None
|
659
|
One
|
329
|
Two
|
52
|
Three
|
13
|
Four or more
|
8
|
(CO 2) 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?
(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?
(CO 2) 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(over 60’)?
(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?
(CO 2) 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 a rural location.
(CO 2) 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 from the North, given that it is correct.
(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:
(CO 2) Classify these events. Some businesses paint the outside of their buildings red while some businesses offer employees health benefits. These events would be considered:
(CO 2) 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?
(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?
Comments
Post a Comment