A leading medical journal claims that 68% of high school students experience anxiety just before an exam. A school counselor wants to conduct a survey to verify this with the students in her school and wants to do so with a margin of error (ME) of 7%. What minimum sample size, rounded to the nearest whole person, does the counselor need to use?

N ? 175

N ? 178

N ? 200

N ? 262

A research organization has recently issued a statement suggesting that 40% of American mothers are unhappy with their children's work habits. You have designed a simulation to generate sample data refuting this claim. An automated random number sample program is used that has sample of size 25, is run 100 times, and uses the numbers 1 through 10 to represent unhappy mothers, and the numbers 11 through 25 to represent happy mothers. The dot plot below represents the outcome of the simulation.

American Mothers Unhappy with Children's Work Habits 18 17 16 15 14 Sample: 25 2 Trials: 100 Frequency 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Number of Unhappy Mothers