A Phycologist Is Interested in Determining the Proportion of Algae

Multiple Choice

A phycologist is interested in determining the proportion of algae samples from a local rivulet that belong to a particular phyla, and he believes the phyla should be uniformly distributed. A simple random sample of 60 alga was obtained, and each was categorized as being a member of Rhodophyta, Chlorophyta, or Heterokontophyta. The observed counts were 25, 25, and 10, respectively. Under the null hypothesis of a uniform distribution of algae to phyla, what is the chi-square component due to Heterokontophyta?

A) -5.00
B) -1.25
C) 1.25
D) 5.00