Both a and b are correct.Which of the following is needed before a confidence interval can be established for a population mean?
a. A confidence level
b. A point estimate of the population mean
c. An estimate of the sampling error associated with the sample mean
d. All of these are correct.
e. Both a and b are correct.
Question 2
Existing social networks are:
a. exclusively for consumers.
b. used by both consumers and business people.
c. experiencing slowing growth.
d. used mostly by nonmobile users.
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