Question 1
Which statement correctly compares
t-distributions to the Normal distribution?
I.
t distributions are also mound shaped and symmetric.
II.
t distributions are more spread out than the normal distribution.
III. As degrees of freedom increase, the variance of
t distributions becomes larger.
◦ I and II only
◦ I and III only
◦ II only
◦ I only
◦ I, II, and III
Question 2
A company checking the productivity of its assembly line monitored a random sample of workers for several days. They found that a 95% confidence interval for the mean number of items produced daily by each worker was (23,27). Which is true?
◦ 95% of all the workers average between 23 and 27 items a day.
◦ 95% of samples would show mean production between 23 and 27 items a day.
◦ Workers produce an average of 23 to 27 items on 95% of the days.
◦ We're 95% sure that the mean daily worker output is between 23 and 27 items.
◦ 95% of the workers sampled produced between 23 and 37 items a day.
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