c) Symmetric for low degrees of freedom
d) 𝜎/𝑛
c) 𝜒 2 -distribution
c) 30
b) 24
b) Population must be normal
d) A normal distribution
b) Decreases
d) t-distribution
b) Symmetric and bell-shaped
c) 0.975
c) t-distribution
c)
b) It is symmetric and bell-shaped
c) 𝜇
c) A standard normal distribution
a) Standard error
d) t-statistic
c) 𝑛 − 1
b) The probability distribution of a sample statistic