When the sample size n is large, the 90% confidence interval for ${ }^{\mu} Y$
is
A) $\bar { Y }$ ± 1.96SE( $\bar { Y }$ ).
B) $\bar { Y }$ ± 1.64SE( $\bar { Y }$ ).
C) $\bar { Y }$ ± 1.64 ${ } ^ { \sigma } Y$
D) $\bar { Y }$ ± 1.96.

Question

When the sample size n is large, the 90% confidence interval for ${ }^{\mu} Y$
 is
A) $\bar { Y }$ ± 1.96SE( $\bar { Y }$ ).
B) $\bar { Y }$ ± 1.64SE( $\bar { Y }$ ).
C) $\bar { Y }$ ± 1.64 ${ } ^ { \sigma } Y$
D) $\bar { Y }$ ± 1.96.

Quizplus · Accepted Answer

For a 90% confidence interval, the z-score is approximately 1.64, so the interval is $\bar { Y }$ ± 1.64SE( $\bar { Y }$ ).

When the Sample Size N Is Large, the 90% Confidence μY{ }^{\mu} YμY

When the Sample Size N Is Large, the 90% Confidence ${ }^{\mu} Y$