Exam 9: Hypothesis Testing II: the Two-Sample Case

A researcher conducted a survey to determine if older people have different feelings about abortion than younger people.He used an alpha level of 0.05 (Z critical = $\pm$ 1.96)to test for significance and found that his computed test statistic was 2.76.He may conclude that

Since critical values of t vary by sample size,before using the t table we must first calculate

For all tests of hypothesis,the probability of rejecting the null hypothesis is a function of

When testing the significance of the difference between two sample proportions,the null hypothesis is

Random samples of men and women have been given a scale that measures their support for gun control.Men average 10.2 with standard deviation of 5.3.Women also average 10.2 but their standard deviation is 1.8.How could these results be dealt with appropriately?

The higher the alpha level,

In the two sample case,the null hypothesis is always about the difference in the

When testing for the significance of the difference between two sample means,the null hypothesis is that

When random samples are drawn so that the selection of a case for one sample has no effect on the selection of cases for another sample,the samples are

From a university population,random samples of 145 men and 237 women have been asked if they have ever cheated in a college class.8% of the men and 6% of the women said that they have.What is the appropriate test to assess the significance of this difference?

A researcher conducted a survey to determine if older people have different feelings about abortion than younger people.He used an alpha level of 0.05 (Z critical = $\pm$ 1.96)to test for significance and found that his computed test statistic was 2.76.Which of the following conclusions is justified?

When testing hypotheses using two small samples,the t distribution may be used only after the additional assumption that

When testing for the significance of the difference between sample means with small samples,the proper sampling distribution is

When testing for the significance of the difference between two sample means,which of the following is almost always unknown?

Samples from two high schools are being tested for the difference in their average levels of prejudice.One sample contains 39 respondents and the other sample contains 47 respondents.The appropriate sampling distribution is the

Which of the following was true for the test for differences in average education by gender reported in the text?

The lower the alpha level,

The value of all test statistics increases as ____ increases.

A scale measuring confidence in the media was administered to a sample.Is there a statistically significant difference between Democrats and Republicans on the scale? Higher scores on the scale indicate greater confidence.Use the five step model and write a sentence or two interpreting your results. Democrats Republicans =8.5 =7.8 =1.5 =1.1 =36 =35

When conducting hypothesis tests for two sample means,the test statistic is