单项选择题

Which of the following statements about sampling errors is FALSE

A. Sampling errors are errors due to the wrong sample being selected from the population.
B. Sampling error is the difference between a sample statistic and its corresponding population parameter.
C. Sampling errors will vary from one sample to the next.

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单项选择题Which one of the following best characterizes the alternative hypothesis The alternative hypothesis is usually the:

A. hypothesis that is proved through statistical testing.
B. hoped -for outcome.
C. hypothesis to be proved through statistical testing.

单项选择题Construct a 90 percent confidence interval for the starting salaries of 100 recently hired employees with average starting salaries of $ 50000 and a standard deviation of $ 3000 assuming the population has a normal distribution.

A. 50000±1.65 (3000);
B. 50000±1.65 (300).
C. 30000±1.65 (5000).