Question

Researchers investigate how the size of a bowl affects how much ice-cream people tend to scoop when serving themselves. People were randomly given a 17-oz bowl or a 34-oz bowl. They were then invited to scoop as much ice cream as they liked. Here are the summaries:

Small Bowl: n=26, y=5.07 oz, s=1.87 oz

Big Bowl: n=22, y=6.58 oz, s=2.91 oz

1. Calculate the 90% confidence interval for the difference in portion size between the big and small bowl. Put the CI in a sentence.

b. Use the 4-step approach to test an appropriate hypothesis and answer the question: Did the bowl size change the selected portion size?

Answer 1