Question: What is typically considered the crossover point between the t- and Z- tests? Sample size of 30 When standard deviation is known Degrees of freedom

What is typically considered the crossover point between the t- and Z- tests?

Sample size of 30

When standard deviation is known

Degrees of freedom are unknown

To model rates such as defects per unit

The measure of the central location for the nominal scale is considered to be the:

Mode

Median

Arithmetic mean

Average

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