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A researcher randomly selects a sample of participants from a population with a variance of 4. If the researcher selects a sample of 16 participants with a mean of 12, then what is the mean and standard error for the sampling distribution of the mean?
A. mean = 12, standard error = 2
B. mean = 12, standard error = 1
C. mean = 12, standard error = 0.5
D. There is not enough information to answer this question.
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Evaluate the performance of this decision.
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 16. At alpha = 0.05 is there enough evidence to reject the researche..
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