Assume that on 12 test areas, different wheat types were planted. After the harvest, these areas resulted in the following yield per hectare: 35.5, 33.7, 37.8, 31.2, 37.2, 34.1, 35.8, 36.6, 37.1, 34.9, 36.6, and 34.0. From experience, we know that the yields per hectare are independent and normally distributed random variables with the parameters μ = 34.52 and σ = 3.24. What is the 95% confidence interval for the estimated mean yield per hectare?