What is the value of z score required for a 70 confidence


What is the value of z score required for a 70% confidence interval?

find the midrange for the given sample data. 

1.5 2.5 3.0 1.2 1.3 3.8 1.8 3.3 2.3 2.9 1.8

What is the z-score that corresponds to the 20th percentile of the normal distribution

Will the t statistics calculated from 4 observations valid?

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