MATH 221 Week 1 Quiz 1

MATH 221 Week 1 Quiz 2 | Devry University

Week 1: Quiz

Question 1

 (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?  

·         Population: 1272 pre-owned vehicle shoppers; Sample: pre-owned vehicle shoppers  

·         Population: pre-owned vehicle shoppers; Sample: 1272 pre-owned vehicle shoppers  

·         Population: 1272 pre-owned vehicle shoppers; Sample: the 8% that bought extended warranties  

·         Population: pre-owned vehicle shoppers; Sample: the 8% that bought extended warranties

 Question 2

 (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?  

·         Parameter as it represents the sample    

·         Statistic as it represents the sample  

·         Statistic as it represents the population  

·         Parameter as it represents the population

 Question 3

 (CO 1) Classify the data of the number of customers at a restaurant.  

·         Qualitative  

·         Statistics  

·         Quantitative  

·         Classical

 Question 4

 (CO 1) The data set that lists a company’s competitors and their locations would be classified as what type of data?  

·         Interval  

·         Ratio  

·         Ordinal  

·         Nominal

Question 5

 (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?  

·         Ordinal  

·         Nominal  

·         Ratio  

·         Interval

 Question 6

 (CO 1) What type of data collection might be best to estimate whether a new medicine is more effective in curing the common cold than aspirin?  

·         Simulation  

·         Observational    

·         Experiment  

·         Survey

 Question 7

 (CO 1) What type of data collection might be best to study the effect of car crashes on humans?  

·         Experiment 

·         Survey  

·         Observational    

·         Simulation

 Question 8

 (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?  

·         Systematic  

·         Cluster    

·         Stratified 

·         Random

Question 9

 (CO 2) Which of the following graphs would be a dot plot?

·         This graph shows 6 horizontal bars with the lengths of the bars generally decreasing from bottom to top.

·         This graph has a horizontal axis with 5 columns of vertical dots.

·         This graph shows 6 contiguous vertical bars with height generally decreasing from left to right

·         This graph has a vertical and horizontal axis.  It has points plotted in a generally increasing pattern from left to right.  There is also a red line of best fit plotted through middle of the points, also increasing from left to right.

Question 10

 (CO 1) For which data set below would the median be the best representation of the typical value or behavior of the data set.  

·         Weights  

·         Religious affiliation  

·         Ages of college students   

·         Sale prices for homes

·         Mean, median, and mode

Question 11

 (CO 1) Which of the following graphs would be considered right skewed?

·         This graph is a histogram with 6 bars all of the same height.

·         This is a histogram with 6 bars.  The tallest bars are on the far-right side of the gird. The bars decrease in height going from right to left with the shortest bars on the far left.

·         This is a histogram with 5 bars.  The tallest bar is in the middle. The height of the bars decreases on either side symmetrically with the smallest bars on the far left and far right.  

·         This is a histogram with 6 bars.  The tallest bars are on the far-left side of the gird. The bars decrease in height going from left to right with the shortest bars on the far right.

Question 12

 (CO 1) Which graph would be best to display the frequency of each genre of movie being released each year?  

·         Pie chart    

·         Histogram 

·         Pareto chart  

·         Line plot

·         Pareto charts

Question 13

 (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?  

·         5.45  

·         2.73  

·         2.62 

·         2.50

 Question 14

 (CO 1) What would be the mean of this data set: 8, 9, 7, 451, 7, 1, 5, 3, 4?  

·         55.3  

·         27.5   

·         55.0  

·         75.3

 Question 15

 (CO 1) A pharmaceutical company wants to determine if its new medicine helps heal bruises more quickly than not treating the bruise. What type of study would be best suited to make this determination? 

·         Experimental  

·         Observational  

·         Survey 

·         Simulation

 Question 16

 (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:  

·         Random 

·         Cluster

·         Stratified 

·         Convenience

 Question 17

 (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  

·         17.5 which means that many of the ages will be around the square of this value  

·         16.5 which means that many of the ages will be around this value    

·         16.5 which means that many of the ages will be within this value of the average age    

·         17.5 which means that many of the ages will be within this value of the average age

 Question 18

 (CO 1) What is the mode of the following data set?

·         2, 2, 3, 3, 3, 4, 4, 5, 5, 6, 7, 7, 7  

·         7  

·         3  

·         2, 3, 4, 5, 6, and 7    

·         3 and 7