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