1. Does the herb Echinacea help the common cold? A study by researchers at the University of Wisconsin-Madison published a study in theAnnals of Internal Medicinethat found that Echinacea was no better than the standard cold medicine. People who recently came down with colds were random assigned either Echinacea in capsule form or the standard cold medicine in capsule form. After 10 days, the researchers reported that there was no statistically significant difference in the duration of the cold between these groups. Identify the type of study.

a. Observational study

b. Experiment

c. Block Design

d. Cluster Sample

2. A manager at a store claims that the average customer service rating is 4.8. A sales associate takes a random sample and conducts a hypotheses test to test the accuracy of this claim. The resulting calculator output from the hypothesis test is shown below.

T-Test H#4. 8 t=2. 121320344 =0. 0389780539 x=5. 1 Sx=1 n=501-PropZTest Prop>0. 15 Z=1 . 980295086 P=0. 0238351202 p=0. 2 n=200