Identify the z-critical value needed for a given confidence interval.

What value of z* should be used to construct a 90% confidence interval of a population mean? Answer choices are rounded to the hundredths place.

a)2.58

b)1.28

c)1.96

d)1.65

I tried a similar question earlier Course Hero said it was answered but I couldn't get to the problem after clicking on it. Could you guide me in the direction of what function is used to complete on a graphing calculator? and what steps are needed like input and the resulting output. My teacher shows a z-chart but I was told it was a easier way