Question: 1) what is the difference between sample estimate and population parameter? if the sample mean of GRE test scores distribution was 90 and variance equivelent

what is the difference between sample estimate and population parameter? if the sample mean of GRE test scores distribution was 90 and variance equivelent to 225 what can you say about the population distribution?

if the mean score of class of 20 students in Marketing is 80 and variance is 256. calculate the coefficient of variation and provide an interpretation of the results.

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