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Find the t or z score when [tex]n = 10[/tex] and the confidence level (C.L.) is 90%.

A. [tex]t = 1.64[/tex]
B. [tex]z = 1.64[/tex]
C. [tex]t = 1.28[/tex]
D. [tex]z = 1.28[/tex]

Answer :

Final answer:

The z-score corresponding to a confidence level of 90% is approximately 1.28 (choice c).

Explanation:

The z-score corresponding to a confidence level of 90% can be found by using the z-table. In this case, the z-score is approximately 1.28 (choice c). Therefore, the correct answer is c) t = 1.28.

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