Microsoft Excel was used on a set of data involving the number of parasites found on 46 Monarch butterflies captured in Pismo Beach State Park. A biologist wants to know if the mean number of parasites per butterfly is over 20. She will make her decision using a test with a level of significance of 0.10. The following information was extracted from the Microsoft Excel output for the sample of 46 Monarch butterflies:
n=46: Arithmetic Mean=28.00: Standard Deviation=25.92: Standard Error=3.82: Null Hypothesis: Ho:u<=20.000: a=0.10: df=45: T Test Statistic=2.09: One-Tailed Test Upper Critical Value=1.3006: p-value=0.021: Decision=Reject.
Referring the the table above, the parameter the biologist is interested in is:
the mean number of butterflies in Pismo Beach State Park.
the mean number of parasites on these 46 butterflies.
the mean number of parasites on Monarch butterflies in Pismo Beach State Park.
the proportion of butterflies with parasites
In this solution, the goal is to clearly state population parameter under study in a test of hypothesis.