One Hundred Adults Who Had Either Type 1 or Type

Multiple Choice

One hundred adults who had either Type 1 or Type 2 diabetes were divided into 2 groups to determine if the inhalable version of insulin is able to manage blood sugar levels just as well as injected insulin. The first group used the inhaler for 3 months first and then the injections for 3 months. The other group used the two methods in reverse order. If we wish to determine if there is a difference in average blood sugar levels using the two different methods, which inference procedure should we use?

A) A t-test about the difference between two means for independent samples.
B) A t-test about the mean difference for paired data.
C) A confidence interval for the difference between two means for independent samples.
D) A confidence interval for the mean difference for paired data.