Exam 9: Using Statistics to Answer Questions

What are the properties of the ratio scale of measurement? Give an example.

Jordan would like to graph the number of men versus women in her class. Jordan should use a

If we rank the winners of a horse race (first, second, third), we are using a(n) ____________ scale of measurement.

When data are presented in a pie chart,

Distinguish between a one-tailed and a two-tailed test. In which instance is it easier to find a significant result? Explain.

Suppose exam scores are normally distributed with M = 80 and SD = 5. Approximately what percentage of scores fall between the scores of 75 and 85?

Under what circumstances should you calculate the median instead of the mean?

Casey needs to graph percentages that total 100%. Casey should use which kind of graph?

Directional hypotheses are associated with _____ tests and nondirectional hypotheses are associated with _______ tests.

Suppose exam scores are normally distributed with M = 70 and SD = 10. According to the text, 34.13% of exam scores should fall between ________ and ________.

By changing the significance level from .05 to .01, you _______ the chance for a Type I error and ________ the chance for a Type II error.

scenario Nora would like to conduct an experiment to determine whether behavior modification techniques can help children eliminate bedwetting. She obtains a sample of children who wet the bed and randomly assigns half to the behavior modification therapy and half to a control group who receive no therapy. After six months, she measures how often children in each group wet the bed. -Consider the following hypothesis: "If children undergo behavioral modification therapy, then they will have different rates of bedwetting than children in the control group." If this is Nora's hypothesis, then she should use a

A single number that represents the total amount of variation in a distribution is known as the

The vertical or y axis of a graph is known as the

What is a histogram? Under what circumstances do researchers use a histogram? Draw a sample histogram.

scenario Nora would like to conduct an experiment to determine whether behavior modification techniques can help children eliminate bedwetting. She obtains a sample of children who wet the bed and randomly assigns half to the behavior modification therapy and half to a control group who receive no therapy. After six months, she measures how often children in each group wet the bed. -Suppose the results show that children in the control group wet the bed on average M = 5.50 times per week and children in the therapy group wet the bed M = 1.60 times per week. Do these results show that the therapy was effective?

What is a correlation coefficient? Draw a scatterplot depicting a positive correlation. Draw a scatterplot depicting a negative correlation. Draw a scatterplot depicting a zero correlation. What does it mean when two variables are positively correlated versus negatively correlated?

The y axis of a graph is also known as the ________ and the x axis of a graph is also known as the ________.

The extent to which scores spread out around the mean is known as

The branch of mathematics that involves the collection, analysis, and interpretation of data is referred to as