Intro to Statistics Milestone 1
In a bolt-manufacturing factory, it is estimated that 6% of the bolts being manufactured will be
defective, with a 3% margin of error.
Choose the statement that correctly describes the confidence interval. - The percentage of defective
bolts is between 3% and 9%.
Jay wants to study nutrition and performance in schools using available data.
Which of the scenarios below will provide Jay with available data? - Going to a local high school and
asking the principal for information about students' current and previous grades, then asking the health
teacher for the results from a survey students took in health class.
At a school of 900 students, 20% have blue eyes. A student randomly selects 100 students and finds 17%
of them have blue eyes. A second student takes another random sample of 90 students and finds 24% of
them have blue eyes.
Which of the following explains why there is a difference between the two percentages? - Random
error; the numbers were different due to variability inherent in sampling.
Which of these random samples represents a representative sample of the number of students in a
middle school who walk to school? - 150 random students at lunch
A survey result shows that cell phone usage among teenagers rose from 63% in 2006 to 71% in 2008.
Of the following choices, which two statements about cell phone use among teenagers is true? - Cell
phone usage rose by 8 percentage points.
Cell phone usage rose by 12.7%
Ben is measuring the effect that the potential energy of an object has on the height of an object's
bounce - Response variable
