# MATH221 Week 3 Quiz New – 24 Questions – 100% Score – Study Guide – Perfect Solution

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Problem Statement

Question 1

(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?

1. Population: people who like sweaters; Sample: the 74% that had a wild holiday sweater
2. Population: people who like wild sweaters; Sample: the 385 people who like wild sweaters
3. Population: people who like wild sweaters: Sample: the 385 people who had a wild holiday sweater
4. Population: people who like wild sweaters; Sample: the 74% that had a wild holiday sweater

Question 2

(CO 1) Classify the data of the top grossing movies for 2017.

Qualitative
Classical
Statistics
Quantitative

Question 3

(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?
Ratio
Nominal
Interval
Ordinal

Question 4

(CO 1) What type of data collection might be best to estimate how many books individuals read in the past 6 months?
Experiment
Survey
Simulation
Observational

Question 5

(CO 1) What type of data collection might be best to study how many books students bring into the media center during finals week?
Survey
Simulation
Experiment
Observational

Question 6

(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?
Cluster
Stratified
Random
Systematic

Question 7

(CO 2) Which of the following graphs would be a line graph?

Question 8

(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?
31.8-55.2
35.7-51.3
39.6-47.4
42.5-44.5

Question 9

(CO 1) Which of the following graphs would be considered normally distributed?

Question 10

(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 13.8 and 24.2?
68% based on the histogram
68% based on the Empirical Rule
95% based on the Empirical Rule
95% based on the histogram

Question 11

(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?
1.85
1.94
5.82
2.91

Question 12

(CO 1) What would be the mean of this data set: 8, 9, 7, 508, 7, 1, 5, 3, 4?
55.2
5.7
57.0
61.3

Question 13

(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:
Cluster
Stratified
Convenience
Random

Question 14

(CO 1) What is the standard deviation and its meaning in the sample of customer ages? 45, 76, 30, 22, 51, 40, 63, 66, 27
17.8 which means that many of the ages will be within half of this value of the average age
17.8 which means that many of the ages will be around this value
18.8 which means that many of the ages will be around the square of this value
18.8 which means that many of the ages will be within this value of the average age

Question 15

(CO 3) A random selection from a deck of cards selects one card. What is the probability of selecting a spade?
0.025
0.250
0.077
0.050

Question 16

(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?
(Yes, Yes)(No, No)(North, North)(South, South)(East, East)(West, West)
(Yes, North)(Yes, South)(Yes, East)(Yes, West)(Yes, No)(No, North)(No, South)(No, East)(No, West)
(Yes, North)(Yes, South)(Yes, East)(Yes, West)(No, North)(No, South)(No, East)(No, West)
(Yes, No, North, South, East, West)

Question 17

(CO 3) Consider the table below

What is the probability that the next person asked has no cats?

50%
62%
5%
31%

Question 18

(CO 3) Consider the table below

What is the probability that the next person chosen will be in the 40-49 or 50-59 age groups?

35.4%
23.7%
31.7%
42.5%

Question 19

(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?
0.144
0.216
0.096
0.288

Question 20

(CO 3) Consider the table below.

Find the probability that a randomly selected location is going to be profitable, given that it is in an urban location.

56.8%
48.8%
51.4%
36.2%

Question 21

(CO 3) Consider the table below.

Find the probability that a randomly selected product is from the West, given that it is defective.
34.8%
28.5%
15.6%
84.4%

Question 22

(CO 3) 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:
Dependent
Subjective
Independent
Empirical

Question 23

(CO 3) Classify these events. Some businesses have large stores and some businesses have large parking lots. These events would be considered:
Classical
Independent
Dependent
Subjective

Question 24

(CO 3) Randomly select a customer that purchases tofu. Randomly select a customer that purchases chicken. Are these events mutually exclusive?
Non-mutually exclusive events
Mutually exclusive events

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