Introduction to Statistics and Data Analysis
5th Edition
ISBN: 9781305115347
Author: Roxy Peck; Chris Olsen; Jay L. Devore
Publisher: Brooks Cole
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Chapter 2.3, Problem 36E
The following is from an article titled “After the Workout, Got Chocolate Milk?” that appeared in the Chicago Tribune (January 18, 2005):
Researchers at Indiana University at Bloomington have found that chocolate milk effectively helps athletes recover from an intense workout. They had nine cyclists bike, rest four hours, then bike again, three separate times. After each workout, the cyclists downed chocolate milk or energy drinks Gatorade or Endurox (two to three glasses per hour); then, in the second workout of each set, they cycled to exhaustion. When they drank chocolate milk，the amount of time they could cycle until they were exhausted was similar to when they drank Gatorade and longer than when they drank Endurox.
The article is not explicit about this, but in order for this to have been a well-designed experiment, it must have incorporated random assignment. Briefly explain where the researcher would have needed to use random assignment in order for the stated conclusion to be valid.
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What do people actually order at Chipotle? How healthy is a normal Chipotle meal? Chipotle and other relatively new
healthier menu choices than the traditional fast food outlets like McDonald's, Taco Bell, Burger King, etc.
fast casual
chains like Shake Shack, Potbelly and Five Guys typically promote themselves as having
The recommended daily calorie intake for most adults is 1,600 to 2,400. The histogram below shows the calories in approximately 3,000 meals ordered from Chipotle on Grubhub.
Many burritos and burrito
bowls end up with 900 to
1,000 calories.
Recommended dietary allowance
2,000 calories
6% of meals
5%
This small bump is
4%
mostly from sides of
chips and guacamole.
3%
2%
About 2 percent of meals
had more than 2,000
calories.
1%
200
400
600
800
1,000
1,200
1,400
1,600
1,800
2,000
2,200
2,400
2,600
2,800
While the histogram
not perfectly symmetric (there is mild right skewness), it is close enough to being symmetric and bell-shaped to justify using the 68-95-99.7 rule.…
Chapter 2 Solutions
Introduction to Statistics and Data Analysis
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