The owner of a meat market has an assistant who has determined that the weights of roasts are normally distributed, with a mean of 3.2 pounds and standard deviation of 0.8 pounds. If a sample of 25 roasts yields a mean of 3.6 pounds, what is the Z-score for this sample mean?
a. -2.50 c. -0.50
b. 2.50 d. None of these choices.
Question 2
Testing whether the slope of the population regression line could be zero is equivalent to testing whether the:
a. sample coefficient of correlation could be zero
b. standard error of estimate could be zero
c. population coefficient of correlation could be zero
d. sum of squares for error could be zero
The small-scale distribution of different tree species in a Douglas-fir forest is determined by both
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