Four research teams each used a different method to collect data on how
fast a new brand of paint dries. assume that they all agree on the sample size
and the sample mean (in minutes). use the confidence level; confidence
interval) pairs below to select the team that has the smallest sample
standard deviation.
a. confidence level: 95%; confidence interval: 40 to 50
o
b. confidence level: 68%; confidence interval: 44.5 to 45.5
c. confidence level: 95%; confidence interval: 35 to 55
o
d. confidence level: 99.7%; confidence interval: 42 to 48