Question: A sample mean is calculated withn=81. The 95% confidence interval has a value of z2=_____ and a margin of error ofE= ____. Options: 0.980 1.960

A sample mean is calculated withn=81. The 95% confidence interval has a value of

z2=_____ and a margin of error ofE= ____.

Options:

0.980

1.960

1.163

2.326

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