Marine biochemists at the University of Tokyo studied the properties of crustacean skeletal muscles (The Journal of Experimental Zoology, Sept. 1993). It is well known that certain muscles contract faster than others. The main purpose of the experiment was to compare the biochemical properties of fast and slow muscles of crayfish. Using crayfish obtained from a local supplier, 12 fast-muscle fiber bundles were extracted and each fiber bundle tested for uptake of the protein Ca²⁺. Twelve slow-muscle fiber bundles were extracted from a second sample of crayfish and Ca²⁺ uptake measured. The results of the experiment are summarized here. (All Ca²⁺ measurements are in moles per milligram.) Analyze the data using a 95% confidence interval. Make an inference about the difference between the protein uptake means of fast and slow muscles.

Transcribed Image Text:

Fast Muscle Slow Muscle n = 12 n2 = 12 yı = .57 y2 = .37 S1 = .104 $2 = .035