Mathematics, 26.11.2019 22:31, jadaroyval
To test μ for an x distribution that is mound-shaped using sample size n ≥ 30, how do you decide whether to use the normal or student's t distribution?
a. if σ is known, use the standard normal distribution. if σ is unknown, use the student's t distribution with n – 1 degrees of freedom.
b. if σ is unknown, use the standard normal distribution. if σ is known, use the student's t distribution with n – 1 degrees of freedom.
c. if σ is known, use the standard normal distribution. if σ is unknown, use the student's t distribution with n degrees of freedom.
d. for large samples we always the standard normal distribution.
Answers: 1
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