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Author Question: A marketing company reviewing the length of television commercials monitored a random sample of ... (Read 141 times)

sc00by25

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on: Aug 30, 2019

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.
Stats: Modeling the World ¦ Bock, Velleman, De Veaux ¦ 4th Edition
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Marked as best answer by sc00by25 on Aug 30, 2019

fauacakatahaias

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Reply #1 on: Aug 30, 2019
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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sc00by25

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Reply 2 on: Aug 30, 2019
Gracias!

Mochi

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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