Creating Confidence Intervals
Using the information from Part 2 above, calculate a 90%, 95%, and 99% confidence interval for both groups and complete the following table:
| Group | 90% confidence interval | 95% confidence interval | 99% confidence interval |
| Smokers | |||
| Nonsmokers |
As the level of confidence increases, what happens to the width of the confidence interval: Does it increase or decrease? Explain one reason why this would happen.
Using the 95% confidence interval, compare the BMI of smokers vs. nonsmokers. Write a 2- to 3-sentence paragraph explaining whether these intervals overlap or not. What does that indicate about the differences in BMI between the two groups?
Explain in 1–2 sentences one situation in which you as a researcher might choose a 99% confidence interval or a 90% interval. Fully justify your choice.
Creating Confidence Intervals
Using the information from Part 2 above, calculate a 90%, 95%, and 99% confidence interval for both groups and complete the following table:
| Group | 90% confidence interval | 95% confidence interval | 99% confidence interval |
| Smokers | |||
| Nonsmokers |
As the level of confidence increases, what happens to the width of the confidence interval: Does it increase or decrease? Explain one reason why this would happen.
Using the 95% confidence interval, compare the BMI of smokers vs. nonsmokers. Write a 2- to 3-sentence paragraph explaining whether these intervals overlap or not. What does that indicate about the differences in BMI between the two groups?
Explain in 1–2 sentences one situation in which you as a researcher might choose a 99% confidence interval or a 90% interval. Fully justify your choice.
Creating Confidence Intervals
Using the information from Part 2 above, calculate a 90%, 95%, and 99% confidence interval for both groups and complete the following table:
| Group | 90% confidence interval | 95% confidence interval | 99% confidence interval |
| Smokers | |||
| Nonsmokers |
As the level of confidence increases, what happens to the width of the confidence interval: Does it increase or decrease? Explain one reason why this would happen.
Using the 95% confidence interval, compare the BMI of smokers vs. nonsmokers. Write a 2- to 3-sentence paragraph explaining whether these intervals overlap or not. What does that indicate about the differences in BMI between the two groups?
Explain in 1–2 sentences one situation in which you as a researcher might choose a 99% confidence interval or a 90% interval. Fully justify your choice.
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