HW1

1.1

• 1.Statistics is the science of collecting, organizing, summarizing, and analysing information to draw conclusion or answer questions, it is also about providing a measure of confidence in any conclusions.

• 3.individual

• 5.statistic/parameter

• 7.parameter

• 9.statistic

• 11.statistic

• 13.statistic

• 15.qualitative

• 17.quantitative

• 19.quantitative

• 21.qualitative

• 23.discrete

• 25.discrete

• 27.continuous

• 29.discrete

• 39. population: teenagers who are 13 to 17 years of age and live in the United States sample: 1028 teenagers who are asked
• 40. population:random 50 bottles selected sample:bottles that are filled on Oct.15
• 41. population:all soybean crop sample:100 plants been weighed
• 42. population:all households sample:50,000 households that are surveyed

1.2

• 13. observational study
• 14. designed experiment
• 15. designed experiment
• 16. observational study

1. This is a cohort study because it continued over ten years of studying.
2. The response variable is whether the individual has heart disease or not, while the explanatory variable is the individual is happy or not. c.There are confounding variables exist in the research. Like people are more likely to eat healthy when they are happy.

1. This is a case control study. Since researchers asked individuals to recall their daily habits and their condition of skin cancer. These can’t have effect in a short amount of time.
2. The response variable is whether the individual has skin cancer, while the explanatory variable is individual’s daily coffee consumption. c.Because there are confounding variables like individuals who drinks more coffee a day tend live a healthier life.