Introductory Statistics 2e

# E | Solution Sheets

Introductory Statistics 2eE | Solution Sheets

## Hypothesis Testing with One Sample

Class Time: __________________________
Name: _____________________________________

1. H0: _______
2. Ha: _______
3. In words, CLEARLY state what your random variable $X ¯ X ¯$ or $P ′ P ′$ represents.
4. State the distribution to use for the test.
5. What is the test statistic?
6. What is the p-value? In one or two complete sentences, explain what the p-value means for this problem.
7. Use the previous information to sketch a picture of this situation. CLEARLY, label and scale the horizontal axis and shade the region(s) corresponding to the p-value.
Figure E1
8. Indicate the correct decision (“reject” or “do not reject” the null hypothesis), the reason for it, and write an appropriate conclusion, using complete sentences.
1. Alpha: _______
2. Decision: _______
3. Reason for decision: _______
4. Conclusion: _______
9. Construct a 95% confidence interval for the true mean or proportion. Include a sketch of the graph of the situation. Label the point estimate and the lower and upper bounds of the confidence interval.
Figure E2

## Hypothesis Testing with Two Samples

Class Time: __________________________
Name: _____________________________________

1. H0: _______
2. Ha: _______
3. In words, clearly state what your random variable $X ¯ 1 − X ¯ 2 X ¯ 1 − X ¯ 2$, $P ′ 1 − P ′ 2 P ′ 1 − P ′ 2$ or $X ¯ d X ¯ d$ represents.
4. State the distribution to use for the test.
5. What is the test statistic?
6. What is the p-value? In one to two complete sentences, explain what the p-value means for this problem.
7. Use the previous information to sketch a picture of this situation. CLEARLY label and scale the horizontal axis and shade the region(s) corresponding to the p-value.
Figure E3
8. Indicate the correct decision (“reject” or “do not reject” the null hypothesis), the reason for it, and write an appropriate conclusion, using complete sentences.
1. Alpha: _______
2. Decision: _______
3. Reason for decision: _______
4. Conclusion: _______
9. In complete sentences, explain how you determined which distribution to use.

## The Chi-Square Distribution

Class Time: __________________________
Name: ____________________________________

1. H0: _______
2. Ha: _______
3. What are the degrees of freedom?
4. State the distribution to use for the test.
5. What is the test statistic?
6. What is the p-value? In one to two complete sentences, explain what the p-value means for this problem.
7. Use the previous information to sketch a picture of this situation. Clearly label and scale the horizontal axis and shade the region(s) corresponding to the p-value.
Figure E4
8. Indicate the correct decision (“reject” or “do not reject” the null hypothesis) and write appropriate conclusions, using complete sentences.
1. Alpha: _______
2. Decision: _______
3. Reason for decision: _______
4. Conclusion: _______

## F Distribution and One-Way ANOVA

Class Time: __________________________
Name: ____________________________________

1. H0: _______
2. Ha: _______
3. df(n) = ______ df(d) = _______
4. State the distribution to use for the test.
5. What is the test statistic?
6. What is the p-value?
7. Use the previous information to sketch a picture of this situation. Clearly label and scale the horizontal axis and shade the region(s) corresponding to the p-value.
Figure E5
8. Indicate the correct decision (“reject” or “do not reject” the null hypothesis) and write appropriate conclusions, using complete sentences.
1. Alpha: _______
2. Decision: _______
3. Reason for decision: _______
4. Conclusion: _______