review 1-6

Consider the following data from a small bookstore.

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CCSS.8.SP.A.1

Disk drives have been getting larger. Their capacity is now often given in terabytes (TB) where 1 TB 1000 gigabytes, or about a trillion bytes. A survey of prices for external disk drives found the data shown.

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CCSS.8.SP.A.1

A study finds that during blizzards, online sales are highly associated with the number of snow plows on the road; the more plows, the more online purchases. The director of an association of online merchants suggests that the organization should encourage municipalities to send out more plows whenever it snows because, he says, that will increase business. Comment on the director's conclusion.

• The director is wrong. The lurking variable here is the temperature. A lower temperature leads to a more severe blizzard, which calls for more plows and keeps people at home,

  where they are more likely to make online purchases

• The director is wrong. If more plows are sent out whenever it snows, the roads will be better and people will leave their home to make purchases, as opposed to staying home and increasing online sales.

• The director is wrong. The lurking variable here is the severity of the blizzard. A more severe blizzard calls for more plows and keeps people at home, where they are more likely to make online purchases.

• The director is correct. More plows keep people at home, where they are more likely to make online purchases

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CCSS.HSS.ID.C.9

The fastest horse in Kentucky Derby history was Secretariat in 1973. The scatterplot shows speed (in miles per hour) of the winning horses each year. What do you see? In most sporting events, performances have improved and continue to improve, so surely we anticipate a positive direction. But what of the form? Has the performance increased at the same rate throughout the past 140 years?

• The scatterplot appears to be roughly linear. The speeds have decreased steadily since the beginning and appear to follow an approximately straight line.

• The scatterplot does not appear to be linear. The speeds appear to increase from the beginning to about 1970, but have not increased since then.

• The scatterplot does not appear to be linear. The speeds appear to decrease from the beginning to about 1970, and have increased steadily since then.

• The scatterplot appears to be roughly linear. The speeds have increased steadily since the beginning and appear to follow an approximately straight line

A ceramics factory can fire eight large batches of pottery a day. In order to better understand pieces breaking, the factory records the number of broken pieces in each

batch for 3 days and then creates the scatterplot shown to the right. What aspect of the company's problem is more apparent in the scatterplot?

A. The

• There is no relationship between batch number and broken pieces.

• The positive , somewhat linear relationship between batch number and broken pieces

• The constant relationship between batch number and broken pieces

• The negative, somewhat linear relationship between batch number and broken pieces

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CCSS.HSS.ID.B.5

Owners of a new coffee shop tracked sales for the first 20 days and displayed the data in the accompanying scatterplot (by day). Make a histogram of the daily sales since the shop has been in business.

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CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

Match the scatterplot with its calculated 0.777 correlation.

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CCSS.HSS.ID.C.8

Match the scatterplot with its calculated 0.006 correlation.

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CCSS.HSS.ID.C.8

Match the scatterplot with its calculated -0.977 correlation.

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CCSS.HSS.ID.C.8

Which of these variables about German Shepherds is most likely to be described by a Normal model?

• age

• breed

• number of days housed in an animal shelter

• weight