O

8. Notation. Our study measured the birth weights and incidence of jaundice among a sample of babies born at our hospital. and we found ? = 6.7 pounds and p = 045, or 45% showed signs of jaundice. Notation. In Exercises 9-12, identify the notation for each given number. 9. Car Batteries. For a random sample of 575 randomly selected car batteries, it was found that their output had a mean of 12.2 volts and a standard deviation of 1.4 volts. 10. Survey. A college has 3427 enrolled students. When 50 of them were randomly selected for a survey, it was found that 10% of them were in favor of fees for parking permits. 11, Quality Control. Among all of the 50,000 aspirin tablets pro- duced by a pharmaceutical company over a given period, a sample of 200 tablets is tested and it is found that 4% of them do not moet specifications. 12, Quality Control. Among all of the 50,000 aspirin tablets pro- duced by a pharmaceutical company over a given period, a sample of 200 tablets is tested and the mean amount of aspirin in these tablets is found to be 328 milligrams (mg) with a stan- dard deviation of 12 mg Concepts and Applications 13. Estimating Population Proportions. In a clinical trial, 1 1,000 male physicians were treated with aspirin and another 1 1,000 male physicians were given a placebo. A variable of interest was the proportion of heart attacks among the physicians. Do the results from this study apply to females? Why or why not? 14. Estimating Population Means. When 50 adult females were randomly selected and their pulse rates were measured, the mean of 75.5 beats per minute (bpm) was obtained. When the sample size was increased to 147 adult females, the mean of 74.0 bpm was obtained. Is the mean from the larger sample closer to the population mean than the result obtained from the smaller sample? Explain. 15. Distribution of Sample Means. Assume that cans of cola are filled such that the actual amounts have a population mean of M = 12.00 ounces. A random sample of 36 cans has a mean