Hypothesis Testing Review

Front

What do we conclude if we find the null hypothesis to be unlikely?

Back

Alternative Hypothesis

Front

What is the 95% confidence interval for the true level of warranty users if a survey of 1200 customers found only 20 with complaints?

Back

Based on the data we are 95% confident the proportion of warranty users is between 0.9% and 2.4%. Therefore the company met its goal.

Front

What is a type I error?

Back

A type I error is when the null hypothesis is rejected when it is true.

Front

What is the FIRST step of a hypothesis test?

Back

State your null & alternative hypotheses.

Front

What are the null and alternative hypotheses if a mayor wants to keep his disapproval rating below 21%?

Back

Ho: p= .21; Ha: p< .21.

Front

What is a null hypothesis?

Back

A null hypothesis is a statement that there is no effect or no difference, and it is the hypothesis that researchers aim to test.

Front

What is an alternative hypothesis?

Back

An alternative hypothesis is a statement that indicates the presence of an effect or a difference, opposing the null hypothesis.

Front

What does a p-value represent in hypothesis testing?

Back

A p-value represents the probability of obtaining test results at least as extreme as the observed results, assuming that the null hypothesis is true.

Front

What is the significance level (alpha) in hypothesis testing?

Back

The significance level (alpha) is the threshold for rejecting the null hypothesis, commonly set at 0.05.

Front

What is a confidence interval?

Back

A confidence interval is a range of values, derived from sample statistics, that is likely to contain the true population parameter.