Standard error of the sample mean equals
A population which includes 500 observations has mean of 40 and standard deviation of 15. A sample of size 100 is taken at random from this population. The standard error of the sample mean equals:
Select one:
a. 2.50.
b. 12.50.
c. 1.343.
d. 1.50.
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Use the first two Bonferroni inequalities to compute an upper and a lower bound on the probability that in a group of 60people, at least 3 were born on the same day.
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Your state is considering raising legal age for consumption of alcoholic beverages to 21 years old. How large a sample size must be taken to make an estimate of the true proportion of citizens who favor this move. The error should be no more than
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