Question

The length of an adult earthworm is normally distributed, with a mean of 10 cm and...

The length of an adult earthworm is normally distributed, with a mean of 10 cm and a standard
deviation of 1.5 cm.

Dr. Who, a biologist at the University of Oshawa, studies the impact of the soil that
earthworms live in on their length. Dr. Who randomly selects 10 earthworms from the educational
garden that includes 500 earthworms and selects another 10 earthworms from the lake shore, where
persumability has thousands of earthwroms.
Which of the following statements is incorrect about the distribution of the mean of the two samples:
a) They have the same standard deviations
b) They have the same means
c) They have significantly different standard deviations
d) Both have the same distributions

Math   Statistics-And-Probability   
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