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7 July, 23:45

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.

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  1. 8 July, 00:13
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    The correct option is 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.

    Step-by-step explanation:

    Consider the provided information.

    The t-distribution of the Student is a distribution of probability that is used when when the sample size is small and/or when the population variance is unknown to estimate population parameters.

    The number of independent observations is equal to the sample size minus one when calculating a mean score or a proportion from a single sample.

    Since µ and σ determine the shape of the distribution so we use standard normal distribution if σ is known.

    Hence, the correct option is 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.
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