Devry MATH221 Week 1 Quiz Latest 2021 June

MATH221 Statistics for Decision Making

Week 1 Quiz

Question 1(CO 1) Among 500 people at the concert, a survey of 35 found 28% found it too loud. What is the population and what is the sample?

  Population: 500 at that concert; Sample: the 28% who found it too loud

  Population: all concert goers; Sample: the 28% who found it too loud

  Population: 500 at that concert; Sample: the 35 in the survey

  Population: all concert goers; Sample: the 500 at that concert

 Question 2(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?

  Parameter as it represents the population

  Statistic as it represents the sample

  Parameter as it represents the sample

  Statistic as it represents the population

 Question 3(CO 1) Classify the data of the top grossing movies for 2017.

  Classical

  Qualitative

  Quantitative

  Statistics

 Question 4(CO 1) The data set that lists a company’s competitors and their locations would be classified as what type of data?

  Ordinal

  Nominal

  Ratio

  Interval

 Question 5(CO 1) A data set that includes the shows on a station during the day would be classified as what type of data?

  Ratio

  Interval

  Ordinal

  Nominal

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?

  Survey

  Observational

  Experiment

  Simulation

 Question 7(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 8(CO 1) You need to study the satisfaction of customers of a specific restaurant. You decide to order food and talk to those customers sitting next to you. This would most closely describe which type of sampling technique?

  Convenience

  Stratified

  Systematic

  Random

 Question 9 (CO 2) Which of the following graphs would be a dot plot?

Question 10(CO 1) In a normally distributed data set of how long customers stay in your store, the mean is 44.8 minutes and the standard deviation is 2.6 minutes. Within what range would you expect 95% of your customers to stay in your store?

  42.2-47.4

  39.6-50.0

  37.0-52.6

  2.6-44.8

Empirical rule

Question 11(CO 1) Which of the following graphs would be considered left skewed?

Question 12(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 17.9 and 26.1?

  68% based on the histogram

  99.7% based on the Empirical Rule

  95% based on the Empirical Rule

  68% based on the Empirical Rule

Empirical rule

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, 6, 5, 9, 3?

  5.18

  2.36

  2.59

  2.25

 Question 14(CO 1) What would be the mean of this data set: 8, 9, 7, 508, 7, 1, 5, 3, 4?

  57.0

  61.3

  5.7

  55.2

 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?

  Observational

  Survey

  Simulation

  Experimental

 Question 16(CO 1) To gather information on customer satisfaction, a researcher goes into several stores and interviews randomly selected customers. This sampling technique is called:

  Cluster

  Random

  Convenience

  Stratified

Question 17(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

  15.8 which means that many of the ages will be within half of this value of the average age

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

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

  16.8 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, 4, 5, 6, 7, 7, 8

  3

  2, 4, 5, and 7

  2

  3 and 4