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# Hypothesis Testing: Types of Tests and Errors

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What is a one tail test? A two tail test?

When are they used?

What is a type I error? A type II error?

In the hypotheses:

Ho: A new auto engine gets the same mpg as an older version
Ha: A new auto engine gets more mpg than an older version

Ho: A new drug for cardio-vascular disease is not safe
Ha: A new drug for cardio-vascular disease is safe

Why is the alternate stated as it is?

What are the "type" errors and their consequences?

##### Solution Summary

This solution helps answer various statistical questions, involving one and two tailed tests and type I and type II errors.

##### Solution Preview

(a) A test where a population parameter is tested to see if it is less than or greater than a specified value

(b) A test where a population parameter is tested to see if it is not equal to a specified value

(c) They are used as the situation demands- whether the parameter to be tested is <, > or <> to a specified value

(d) Type I error: Rejecting a true null hypothesis

Type II error: Failing to reject ...

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.