Question 1
Which of the statements correctly compares
t-distributions to the normal distribution?
I.
t distributions are also mound shaped and symmetric.
II.
t distributions have less spread than the normal distribution.
III. As degrees of freedom increase, the variance of
t distributions becomes smaller.
◦ I, II, and III
◦ I only
◦ I and III only
◦ II only
◦ I and II only
Question 2
A marketing company reviewing the length of television commercials monitored a random sample of commercials over several days. They found that a 95% confidence interval for the mean length (in seconds) of commercials aired daily was (23, 27). Which is true?
◦ We're 95% sure that the mean commercial length is between 23 and 27 seconds.
◦ Commercials average between 23 and 27 seconds long on 95% of the days.
◦ 95% of the commercials they checked were between 23 and 27 seconds long.
◦ 95% of all samples would show mean commercial length between 23 and 27 seconds.
◦ 95% of all the commercials aired were between 23 and 27 seconds a day.
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