This is from CFAI Mock. I am not clear why the answer is −1.960 and 1.960. for a two tailed test shdnt it be for .025 significance level?
[question removed by moderator]
This is from CFAI Mock. I am not clear why the answer is −1.960 and 1.960. for a two tailed test shdnt it be for .025 significance level?
[question removed by moderator]
Would do you well to memorize the whole normally distributed population with known variance.
95 percent confidence intervals: Use z0.025 = 1.96
thanks. Yes memorizing will save time and anxiety.
This is 2 tailed so CI is -1.96 to +1.96
for 1 tailed it will plot at -1.65 or +1.65