In each of the following instances, determine whether you would use a z- or t-statistic (or neither)
Question:
a. Random sample of size n = 21 from a normal distribution with unknown mean m and standard deviation (
b. Random sample of size n = 175 from a normal distribution with unknown mean m and standard deviation (
c. Random sample of size n = 12 from a normal distribution with unknown mean and standard deviation ( = 5
d. Random sample of size n = 65 from a distribution about which nothing is known
e. Random sample of size n = 8 from a distribution about which nothing is known?
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a For asmall sample from a normal distribution with unknown standard deviation we usethe t statisticFor confidence coefficient 095 a 005and a 2 005 2 0025 From Table III Appendix B with df n 1 21 1 20 t 0025 2086 b For alarge sample from a distribution with an unknown standard deviation we can estimatethe population standard deviation with s and use the z statistic ...View the full answer
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