In a two-sample test of means for independent samples, we use the z distribution when - 6035

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In a two-sample test of means for independent samples, we use the z distribution when

a. The population standard deviations are equal.

b. Both populations have at least 4000 observations.

c. Both population standard deviations are known.

d. nB and n(1-B) are both greater than 5.

 
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In a two-sample test of means for independent samples, we use the z distribution when