6. There is a belief that sugar makes children hyperactive. In an investigation to test this theory, 200 randomly selected children under the age of 12 were divided into two groups. One group received a sugar regimen and the other was considered controls. The investigator measured the heart rate per minute to determine if sugar makes children hyperactive. The results are summarized below:

Group n Mean Standard Deviation

Sugar 100 92 3.5

Control 100 90 1.3

1. What is the estimate of the true heart rate for sugar eaters?
2. What is the estimate of the true standard deviation of the heart rate for sugar eaters?
3. What is the estimate of the standard error of the sample mean for sugar eaters?
4. What is the estimate of the standard error of the sample mean for the controls?
5. Explain in words what the estimated standard error of the sample mean for the sugar group means.