Hypothesis Testing 1
When writing a null hypothesis, the symbolic statement always includes __________.
What is an equality?
The value used in making a decision about the null hypothesis is called ________ .
What is a test statistic?
This value separates a critical region (rejection region) from the fail-to-reject region.
What is the critical value?
When the alternative hypothesis includes the "greater than" sign, it is a __________ -tail test.
What is a right-tail test?
Hypotheses (and claims) are always written about the _________ and never about the sample.
What is the population?
If the probability of a particular observed event is extremely small, we conclude that the assumption is probably ___________.
What is incorrect?
The set of all values of the test statistic that causes us to reject the null hypothesis.
What is the rejection region or the critical region?
When the alternative hypothesis includes the "not equal to" sign, it is a __________ -tail test.
What is a two-tail test?
The type of test statistic used when evaluating a null hypothesis involving a proportion.
What is a z-score?
We never _______ a null hypothesis; we either have enough evidence to reject it, or we do not have evidence to reject it.
What is accept (a null hypothesis)?
Rejecting a true null hypothesis is called _________ .
What is a Type I error?
The significance level is noted by this symbol.
What is alpha?
True or false, in a two-tail test, the significance level is split in equal parts between the two tails.
What is true?
The types of test statistics used when evaluating a null hypothesis involving a mean.
What are a z-score or a t-score?
When the alternative hypothesis includes the "less than" sign, it is a __________ -tail test.
What is a left-tail test?
Failing to reject a false null hypothesis is _________ error.
What is a Type II error?
The confidence level is given by this equation that relates to the significance level.
What is: 1 - significance level = confidence level
The p-value (area) corresponds to the __________ while the rejection region (area) corresponds to the critical value.
What is the test statistic?
The type of test statistic used when evaluating a null hypothesis involving a standard deviation.
What is a Chi-squared score?
To write a final conclusion using the proper wording, we use Figure _______________.
What is Figure 8-7 on page 403?
When writing an alternative hypothesis, the symbolic statement always includes __________.
What is an inequality?
The significance level is given by this equation that relates to the confidence level.
What is: 1 - confidence level = significance level
The rejection region/significance level (area) corresponds to the __________ while the p-value (area) corresponds to the test statistic.
What is the critical value?
Ms. Warden must make a decision whether or not to cancel school because of a threatening snow storm. What would the results be of a Type I error for the null hypothesis H0: The weather remains dry.
Type I error: Weather remains dry (null hypothesis is true), and school is needlessly canceled (null hypothesis is rejected).
Ms. Warden must make a decision whether or not to cancel school because of a threatening snow storm. What would the results be of a Type II error for the null hypothesis H0: The weather remains dry.
Type II error: The storm hits (null hypothesis is false), and school isn't canceled (fail to reject null hypothesis).