How do you determine t or z? what should the choice be for this question?
Sol
Given
n = 287
Mean = 29.3
S.D = 7.5
As n is greater than or equal to 30
287 >= 30
Z table is used
Confidence interval = 90% = 0.90
Alpha = 1 - 0.90 = 0.1
Alpha/2 = 0.1 / 2 = 0.05
Z ( 0.05) from z table shows a value of 1.64
Therefore
Z alpha/2 = 1.64
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