Lesson 1.1

 Data : information, usually numerical  Variable : a characteristic which can be classified, counted, ordered or measured.  Population : the set of ALL individuals or objects that are to be studied  Sample : subset of the population.  What is a survey of the entire population? a census

 A physician takes a biopsy of a suspicious growth to check for malignancy. Identify the variable, population, and sample.  Variable:  Population:  Sample: Condition (malignant or non-malignant) The entire suspicious growth The part of the growth that was biopsied.

 Refer to the table on page 7. How many times as likely was a family to have an income of less than $15,000 if the head of the household had some high school, but no diploma rather than graduated from high school? 28.2% % = 42.7% by someone with some high school 13.6% % = 23.8% by someone with a high school degree So about twice as likely!

ContinentArea 1000 m 2 Population (millions) Africa11, Antarctica5,4000 Asia17,4003,340 Australia3,30029 Europe3, North America9, Central and South America6, a. C0nstruct a circle graph of the areas. b. If the areas of the continents were measured in km 2, would the circle graph for area be different? NO!!

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