Author Question: During a cold winter, the temperature stayed below zero for 10 days (ranging from 20 to 5). The ... (Read 239 times)

stevenposner · **on:** Jun 24, 2018

During a cold winter, the temperature stayed below zero for 10 days (ranging from 20 to 5). The variance of the temperatures of the 10 day period _____.
a. is negative since all the numbers are negative
b. must be at least zero
c. cannot be computed since all the numbers are negative
d. can be either negative or positive

Question 2

When constructing a confidence interval for the population mean using the standard deviation of the sample, the degrees of freedom for the t distribution equals
a. n - 1.
b. n.
c. 2n.
d. n + 1.