Devry MATH221 Week 3 Quiz Latest 2020 April

MATH221 Statistics for Decision Making

Week 3 Quiz   

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?

  Population: people who like wild sweaters; Sample: the 74% that had a wild holiday sweater

  Population: people who like wild sweaters: Sample: the 385 people who had a wild holiday sweater

  Population: people who like wild sweaters; Sample: the 385 people who like wild sweaters

  Population: people who like sweaters; Sample: the 74% that had a wild holiday sweater

Question 2 (CO 1) A survey of 481 of your customers shows that 79% of them like the recent changes to the product. Is this percentage a parameter or a statistic and why?

  Parameter as it represents the population

  Statistic as it represents the population !

  Statistic as it represents the sample

  Parameter as it represents the sample

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

  Classical

  Statistics

  Quantitative

  Qualitative

Question 4 (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?

  Interval

  Ratio

  Nominal

  Ordinal

Question 5 (CO 1) A data set that includes the years in which your hometown team won championships would be classified as what type of data:

  Ratio

  Ordinal

  Interval

  Nominal

Question 6 (CO 1) What type of data collection might be best to estimate the amount of time individuals spend socializing?

  Observational

  Survey

  Simulation

  Experiment

Question 7 (CO 1) What type of data collection might be best to study the effect of car crashes on humans?

  Simulation

  Survey

  Observational

  Experiment 

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 1) Which of the following graphs would be a histogram?

  Vertical bars with various lengths

  Horizontal bars with various lengths

  Line moving up and down with area underneath shaded in

  Circle with different colored slices throughout

Question 10 (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

  42.5-44.5

  39.6-47.4