STATS FINAL STUDY SET 3 UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

STATS FINAL STUDY SET 3 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS

Question:
1. Knowing the population standard deviation, a 95% confidence interval infers that the population
mean______.
Answer:
is within +_ 1.96 standard errors of the sample mean

Question:
2. The distribution of Students t is
Answer:
symmetrical

Question:
3. What is the difference between sample mean and population mean called?
Answer:
sampling error

Question:
4. A sample mean is the best point estimate of ____.
Answer:
population mean

Question:
5. when testing the safety of cars using crash tests, a sample of one or two cars is used because.
Answer:
cars are destroyed

Question:
6. When a confidence interval for a population mean is constructed from sample data, __________.
Answer:
we can conclude, for an infinite number of samples and corresponding confidence intervals, that the
population mean is in a stated percentage of the intervals

Question:
7. A sample standard deviation is the best point estimate of the
Answer:
population standard deviation

Question:
8. How is the t-distribution similar to the z-distribution
Answer:
both continuous distributions