A random sample of size n has been selected from a normally distributed population whose standard deviation is . In hypothesis testing for the population mean, the t-test should be used instead of the z-test if: A) n 30 and σ is unknown B) n

Question

A random sample of size n has been selected from a normally distributed population whose standard deviation is . In hypothesis testing for the population mean, the t-test should be used instead of the z-test if: A) n > 30 and σ is unknown B) n < 30 and σ is unknown C) n < 30 and σ is known D) n < 30 and β is known E) n > 30 and σ is unknown and n < 30 and σ is known

Quizplus · Accepted Answer

The Answer of A random sample of size n has been selected from a normally distributed population whose standard deviation is . In hypothesis testing for the population mean, the t-test should be used instead of the z-test if: A) n > 30 and σ is unknown B) n < 30 and σ is unknown C) n < 30 and σ is known D) n < 30 and β is known E) n > 30 and σ is unknown and n < 30 and σ is known

A Random Sample of Size N Has Been Selected from a Normally