Using the Normal Distribution
Open the Body Data file created in ST3001 and use this to address the following questions.
Given that BMI is approximately normally distributed, present the following summary statistics for BMI of smokers and nonsmokers (Hint: Think about ST3001.).
| Smokers | Nonsmokers | |
| Mean | ||
| Standard deviation | ||
| Sample size (n) |
Use this table to answer the following questions based on your individual data. For each part, write a 1-sentence explanation as to how Excel was used to assist you in your computations.
Find the percent of smokers expected to have a BMI of greater than 25 (overweight).
Find the percent of nonsmokers expected to have a BMI of less than 18.5 (underweight).
A normal BMI range is between 18.5 and 24.9. Shat percent of smokers are expected to be within this range? What percent of nonsmokers are expected to be within this range?
A researcher is interested in which BMI represents the 90th percentile (90% are at this BMI level or lower). What BMI score represents the 90th percentile cutoff rate?
Using the Normal Distribution
Open the Body Data file created in ST3001 and use this to address the following questions.
Given that BMI is approximately normally distributed, present the following summary statistics for BMI of smokers and nonsmokers (Hint: Think about ST3001.).
| Smokers | Nonsmokers | |
| Mean | ||
| Standard deviation | ||
| Sample size (n) |
Use this table to answer the following questions based on your individual data. For each part, write a 1-sentence explanation as to how Excel was used to assist you in your computations.
Find the percent of smokers expected to have a BMI of greater than 25 (overweight).
Find the percent of nonsmokers expected to have a BMI of less than 18.5 (underweight).
A normal BMI range is between 18.5 and 24.9. Shat percent of smokers are expected to be within this range? What percent of nonsmokers are expected to be within this range?
A researcher is interested in which BMI represents the 90th percentile (90% are at this BMI level or lower). What BMI score represents the 90th percentile cutoff rate?
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