FW Test & LL – Parent Sig.? (Late)

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Presentation transcript:

FW Test & LL – Parent Sig.? (Late) Math CC7/8 – Be Prepared On Desk: Pencil Calculator Math Journal SP Learning Log Worksheets from yesterday (1.4) Learning Log: HW: p. 21, #6a-c (team 3 only), #22-24 FW Test & LL – Parent Sig.? (Late) If you made corrections on FW they will be graded soon!

Tasks for Today Review HW - #15, 16 Finish Lesson 1.4 C-D – Comparison Statements, variability (Dot Plots & Box Plots)

How might you decide which are faster, steel-frame roller coasters or wood-frame roller coasters?

Range = 68 mi/h Mean = 55.03 mi/h Range = 41 mi/h Mean = 52.6 mi/h

Median = 54.5 mi/h IQR = 28 mi/h Median = 53 mi/h IQR = 10 mi/h Comparisons on next slide…

IQR for steel-frame is more than twice the IQR for the wood-frame The median of the steel-frame is greater than the median of the wood-frame The middle 50% of the speeds for steel-frame are more variable than the middle 50% for wood-frame

At least 25% of the steel-frame coasters have speeds that are faster than those of wood-frame coasters. Box-and-Whisker Plots

The measures of center for steel-frame and wood-frame coasters are somewhat similar. Speeds of steel-frame coasters vary greatly. Measures of spread (specifically IQR) show that at least 25% of the steel-frame coasters have speeds that are faster than those of wood-frame coasters.

SP p. 35

What is the population for the Honesty Survey? Is asking readers to volunteer their answers a good way for the magazine to draw conclusions about the honesty of the population? Why or why not?

The population is the population of the U.S. The sample is the readers of this particular magazine who log on and respond to the internet survey. The sampling plan is to ask people to answer the survey.

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