Data analysis portfolio
Answer the following questions. If you cannot find an answer for a question,
Explain what effect this might have on the information in the article.
Which kind of average has been used?
What was the size of the sample used to find the average?
What is the source of the data? How was the data collected?
Do you think the average was chosen to give valid and reliable results, or to attract the most readers?What is the value of the correlation coefficient for your chosen data? What does it mean?
Using the values in the regression equation, explain what your analysis shows.
Explain the concepts of interpolation, extrapolation, validity and reliability when using a regression model for forecasting.
