Question > (5 points) Saved Is it affordable for a student to eat out on average? This question was asked to a sample of 25 Langara students asking them how much they spend on a meal outside of home. The results provided a sample mean of $8.50 and, it is known that the population standard deviation is $1. (a) [1 mark] Identify the parameter of interest. (b) [2 marks] Find the 90% confidence interval for the parameter in (a). Show your work for full marks. (c) [1 mark] Interpret the confidence interval calculated in the previous part in the context of the question. (d) [1 mark] What condition(s) not yet mentioned must be met for your confidence interval to be valid