Question

please answer all three for full credit

1.)Explain what is wrong in each of the following statements.

a.Available data is always anecdotal.

b.A census collects information on a subset of the population of interest.

c.A sample survey usually involves a treatment.

2.)A study of the effects of blueberries on the bones of mice compared diets containing no blueberries, blueberries as 5% of the diet, and blueberries as 10% of the diet. Ten mice were randomly assigned to each diet. The mice were fed the diets for 30 days, and the total body bone mineral density (TBBMD) was measured at the end of the feeding period. What are the experimental units, the treatments, and the outcomes for this experiment? Would you use the term subjects for the experimental units? Explain your answers.

3.)

You are a teaching assistant for an introductory statistics class. The instructor would like you to interview some of the students in the class to find out their opinion regarding some new interactive activities that she has introduced to the course. There are 123 students in the class, so you cannot interview all of them. You decide to select eight students to interview.

a.What is the population for this setting?

b.What is the sample?

c.Make a spreadsheet with the numeric labels for the 123 students in the class.

d.Use Excel to select the labels of the eight students to be interviewed from the spreadsheet.

e.Explain the steps that you used in sufficient detail so that another person could repeat your work.

Answer 1

Answer to question# 1)

1. Available data may be true may be anecdotal. It is not that it is always anecdotal. Sometimes the available data relates to facts and figures which are true and fair to full extent and hence they are reliable. But at times the available data may not be true and hence anecdotal. This it is important to find the source of the available data before using it for any analysis.
2. A census is a survey that includes every unit of the population, where as a sample survey does not cover all units of the survey.
3. A sample survey may be merely observational as well. A sample study can be divided into two parts: observational study and experimental study. The observation study involves no control or experiment on the environment. Whereas the experimental study involves controlling and manipulating the actual environment to conduct the research.