STAT 200- STAT 200 Week 1 Homework Problems (2). Questions and Answers

STAT 200- STAT 200 Week 1 Homework Problems (2). Questions and Answers STAT 200 Week 1 Homework Problems – 1.1.4 To estimate the percentage of households in Connecticut which use fuel oil as a heating source, a researcher collects information from 1000 Connecticut households about what fuel is their heating source. State the individual, variable, population, sample, parameter, and statistic. Individual – One single Household in CT. Variable – The percentage of households that use fuel oil as a heating source in CT. Population – The number of households that use fuel oil as a heating source in CT. Sample – The 1,000 CT households where the information is gathered. Parameter – The percentage of households that use fuel oil as a heating source drawn from the entire population of CT. Statistic – The percentage of households that use fuel oil as a heating source drawn from the sample (1,000 households in CT). 1.1.8 The World Health Organization wishes to estimate the mean density of people per square kilometer, they collect data on 56 countries. State the individual, variable, population, sample, parameter, and statistic. Individual – One single country. Variable – The mean density of people per square kilometer. Population – The countries of the world. Sample – The 56 countries where the information is gathered. Parameter – The mean density of people per square kilometer drawn from all countries of the world. Statistic – The mean density of people per square kilometer drawn from the sample (56 countries). 1.2.4 You wish to determine the GPA of students at your school. Describe what process you would go through to collect a sample if you use a stratified sample. First, I would gather a list of students from the school. Once I have a list, I will then divide the students into individual strata, or groups, such as grade (ex. Freshman, Sophomore, Junior, and Senior). With the strata created, now I will randomly choose students from each strata and record their GPA. 1.3.4 To evaluate whether a new fertilizer improves plant growth more than the old fertilizer, the fertilizer developer gives some plants the new fertilizer and others the old fertilizer. Is this an observation or an experiment? Why?