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T or F The main reason a research uses a t-test instead of a z-test is when...

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Statistics

T or F

The main reason a research uses a t-test instead of a z-test iswhen little is known about population (mean and standarddeviation).

Values in the t‐table are not actually listed by samplesize but by degrees of freedom (df).

A 90 percent confidence level is equivalent to an alpha level of0.10

The critical value of t‐table for a study with 6participants with alpha set @ .1 one tail is 1.711

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1 The main reason research uses a ttest instead of a ztest iswhen little is known about population mean and standarddeviationThe ttest is used when information about the population isnot known For    See Answer
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