What is the 95% confidence interval for the mean number of pets owned by students at the University of Alberta?
a) [μ - 2σ, μ + 2σ]
b) [μ - σ, μ + σ]
c) [μ - 1.96σ, μ + 1.96σ]
d) [μ - 1.645σ, μ + 1.645σ]