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C.Cannot Determine
Part 5 of 16 -
Question 11 of 23
A previous study of nickels showed that the standard deviation of the
weight of nickels is 150 milligrams. How many nickels does a coin
counter manufacturer need to weigh so that she can be 98% confident
that her sample mean is within 25 milligrams of the true average
weight of a nickel?
A.36
B.196
C.239
D.139
Question 12 of 23
If you are constructing a confidence interval for a single mean, the
confidence interval will___________ with an increase in the sample
size.
A.increase or decrease, depending on the sample data
B.stay the same
C.decrease
D.increase
Part 6 of 16 -
Question 13 of 23
One reason for standardizing random variables is to measure variables
with:
A.different means and standard deviations on a non-standard scale
B.similar means and standard deviations on two scales