(a)[6]
Find a $95\%$ confidence interval for the population mean of $X$.
(b)[1]
State which part of your solution to part (a) uses the Central Limit Theorem.
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
A random sample containing $200$ values of a random variable $X$ produces the following summary: $n = 200$, $\sum (x - 2) = 60$, $\sum (x - 2)^2 = 20$.