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Mathematics Clinic => Statistics => Topic started by: Mimi on Aug 30, 2019

Title: The correlation between a family's weekly income and the amount they spend on restaurant meals is ...
Post by: Mimi on Aug 30, 2019

Question 1

A consumer group collected information on HDTVs.  They created a linear model to estimate the cost of an HDTV (in $) based on the screen size (in inches).  Which is the most likely value of the slope of the line of best fit?
◦ 70
◦ 7
◦ 700
◦ 0.70
◦ 7000

Question 2

The correlation between a family's weekly income and the amount they spend on restaurant meals is found to be r = 0.30. Which must be true?
I.   Families tend to spend about 30% of their incomes in restaurants.
II.  In general, the higher the income, the more the family spends in restaurants.
III. The line of best fit passes through 30% of the (income, restaurant$) data points.
◦ I, II, and III
◦ III only
◦ II and III only
◦ I only
◦ II only

Title: The correlation between a family's weekly income and the amount they spend on restaurant meals is ...
Post by: Bigfoot1984 on Aug 30, 2019

Answer 1

70

Answer 2

II only