Questions from Statistics

Q: A “1-Panel-THC” test for marijuana use

A “1-Panel-THC” test for marijuana use is given to job applicants with these results: Among 143 positive results (indicating marijuana use), 24 are false positives; among 157 negative results (indicat...

Q: The game of BINGO involves drawing numbered and lettered buttons at random

The game of BINGO involves drawing numbered and lettered buttons at random from a barrel. The B numbers are 1–15, the I numbers are 16–30, the N numbers are 31–45, the G numbers are 46–60, and the O n...

Q: Let A denote the event of getting a female when you randomly

Let A denote the event of getting a female when you randomly select a fellow student in your statistics class. Let B denote the event of getting a female when you randomly select a fellow student in y...

Q: For the handicapper in Exercise 1, find the probability that she

For the handicapper in Exercise 1, find the probability that she is correct in each of her next two predictions.

Q: A scatterplot is a graph in which the points are scattered throughout

A scatterplot is a graph in which the points are scattered throughout, without any noticeable pattern.

Q: A geneticist is working with 3 green peas and 1 yellow pea

A geneticist is working with 3 green peas and 1 yellow pea. Let G denote the event of randomly selecting one of these peas and getting one that is green. Let Y denote the event of randomly selecting o...

Q: A pollster randomly selects an adult for a survey. Let M

A pollster randomly selects an adult for a survey. Let M denote the event of getting a male, and let R denote the event of getting a Republican. Are events M and R overlapping?

Q: Let A be the event of rolling an odd number on a

Let A be the event of rolling an odd number on a six-sided dice. Then event not A will be rolling an even number. Are events A and not A overlapping? Why or why not?

Q: What does the correlation coefficient, r, tell us about the

What does the correlation coefficient, r, tell us about the strength of a correlation? What range of values can r have?

Q: A physician finds that increasing the time spent exercising each week results

A physician finds that increasing the time spent exercising each week results in a lower resting pulse rate. Because this is a positive result, we say that there is a positive correlation.