HW1

1.1

• 1. type answer here. Statistics is a the collecting, organizing, summarizing, and analyzing of data used to determine an uncertainty.
• 3. type answer here. An Individual is a person or object that is a member of the populaion being studied.
• 5. type answer here. A statistic is a numerical summary of a sample.
• 7. type answer here. Parameter
• 9. type answer here. Statistic
• 11. type answer here. Parameter
• 13. type answer here. Statistic
• 15. type answer here. Qualitative
• 17. type answer here. Quantitative
• 19. type answer here. Qualitative
• 21. type answer here. Qualitative
• 23. type answer here. Discrete
• 25. type answer here. Continuous
• 27. type answer here. Discrete
• 29. type answer here. Discrete
• 39. type answer here. Population: all teenagers ages 13-17, living in the US Sample: the 1028 teenagers selected by the Gallup Organization
• 40. type answer here. Population: all Coca-Cola bottles filled on October 15th Sample: 50 selected by manager
• 41. type answer here. Population: the whole soybean crop Sample: 100 randomly selected plants
• 42. type answer here. Population: ever household in the US Sample: 50,000 from the US Census

1.2

• 13. type answer here. Observational Study
• 14. type answer here. Observational study
• 15. type answer here. Experiment
• 16. type answer here. Observational study
• 17. type answer here.

1. This is a cohort study, because the researchers collected data on a large group of people over a long period of time to determine their conclusion.
2. The explanatory variable is happiness and the response variable is heart disease.
3. This means that genetics could be a confounding variable in the study that has an effect on both the explanatory and response variables.

• 18. type answer here.

1. This is a cross-sectional study because the researchers compared the amount to nonmelanoma skin cancer in coffee-drinkers over a short period of time.
2. The response variable is the occurrence of skin cancer, and the explanatory variable is the daily coffee consumption.
3. It was important to adjust to these variables because the demographics and lifestyles of these women could be the cause of the skin cancer, not the coffee.