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1. Descriptive Statistics for Exploring Data.md

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Quizz

  1. What is an appropriate way to visualize a list of the eye colors of 120 people? Select all that apply.

box plot


dot plot


pie chart


  1. According to the histogram of travel times to work from the US 2000 census (Page 6 of "Journey to Work: 2000"), roughly what percentage of commuters travel more than 45 minutes?

15.4


3.According to the histogram of travel times to work from the US 2000 census (Page 6 of "Journey to Work: 2000"), approximately what is the median travel time, in minutes (i.e. 50% of commuters have at most that travel time, 50% have at least that travel time)?

22


4.You want to investigate whether households in California tend to have a higher income than households in Massachussetts. Which summary measure would you use to compare the two states?

median household income


5.Suppose all household incomes in California increase by 5%. How does that change the mean household income?

the mean household income goes up by 5%


  1. Suppose all household incomes in California increase by 5%. How does that change the median household income?

median household income goes up by 5%


  1. Suppose all household incomes in California increase by 5%. How does that change the standard deviation of the household incomes?

the standard deviation of the household incomes goes up by 5%


  1. Suppose all household incomes in California increase by 5%. How does that change the interquartile range of the household incomes?

the interquartile range of the household incomes goes up by 5%


  1. Suppose all household incomes in California increase by $5,000. How does that change the mean household income?

the mean household income goes up by $5,000


  1. Suppose all household incomes in California increase by $5,000. How does that change the median household income?

the median household income goes up by $5,000


  1. Suppose all household incomes in California increase by $5,000. How does that change the standard deviation of the household incomes?

the standard deviation of the household incomes doesn't change


Question 12 Suppose all household incomes in California increase by $5,000. How does that change the interquartile range of the household incomes?

the interquartile range of the household incomes doesn't change


  1. The median sales price for houses in a certain county during the last year was $342,000. What can we say about the percentage of sales represented by the houses that sold for more than $342,000?

the houses that sold for more than $342,000 represent exactly 50% of all sales