Assume we have a sample of size n=16 from independent and identically distributed random variables from a normal distribution with mean u and theoretical standard deviation o=4. We let e denote the...

Extracted text: Assume we have a sample of size n=16 from independent and identically distributed random variables from a normal distribution with mean u and theoretical standard deviation o=4. We let e denote the length of the confidence interval with confidence level 1-a. Which of the following statements are true? The length e Veuillez choisir au moins une réponse: а. decreases if n decreases. b. increases if 1-a increases. O c. is divided by 2 if the sample size is multiplied by 2. С. O d. decreases if o decreases. U e. is divided by 2 if the variance is divided by 2. O f. remains interpretable (as well as the confidence interval) if o is assumed to be unknown.