Question 4 Scatterplot (3 marks)

The Excel file 2102_Ass1_Q4.csv contains the dataset for a list of movies. Save a copy of the file from the web to your own work area on the computer.

Use this dataset to perform the following tasks:

1. Make a scatterplot of the data and include it in the assignment using StatKey using alcohol as the explanatory variable and tobacco as the response variable.
2. Is there a positive or negative relationship shown by your scatter plot?
3. Are there any outliers? If so, indicate the movie associated with each outlier.

Question 5 Regression (6 marks)

The Excel file 2102_Ass1_Q5.csv contains the dataset of childrens birth weight in a country. The research decided to use the number of cigarettes a pregnant woman smoked daily (cigs) to predict a babys birth weight in ounces (bwght).

Save a copy of the file from the web to your own work area on the computer. Use the Regression tool in StatKey to perform the following tasks:

1. Are the two variables (cigs and bwght) discrete or continuous? Explain.
2. Find the regression model in context using StatKey (please use the contextual meaning of y and x in this case and keep 3 d.p. for your answer)
3. Use your regression model to predict the birth weight if the mum smokes 6 cigarettes per day.
4. Do you have any concerns about using your regression model to predict the value in (iii)? Explain in one or two sentences.
5. Interpret the slope of the linear regression model in context.
6. Is the intercept of the linear regression model meaningful in this example? Explain in one or two sentences.