I would like you to go to the Statistics Canada siteand look for graphs that are comparing two samples. Usually, you will see a bar graph with two colors with the bars representing a comparison of two samples. I would like you to find 2 different examples of graphs that are comparing two samples. The two samples can be paired samples, two independent samples, or two proportions. They can both be the same type of samples.

You will run the test in Minitab to determine whether there is a statistically significant difference.

Note: It is easiest to find two-proportion examples. Look for posters that compare two percentages. In Minitab, you need to enter the percentages as proportions. If you can find the sample size or approximate sample size then the percentage can be changed to a proportion by multiplying the percentage by the sample size. For example, if you think that 5000 were surveyed are the percentages they give are 15% and 27% then you would convert them to proportions by

0.15 X 5000 = 750 so the proportion would be 750/5000

0.27 X 5000 = 1350 so the proportion would be 1350/5000

Homework:

1. Take screenshots of the posters and explain what they are comparing in the graph.

2. Answer: How were they likely to have collected the data for comparison? What is the approximate sample size?

3. Run the Minitab test and include the output. Write the hypothesis and conclusion. Is there a significant difference in the samples they are comparing?

4. Do you think the poster was trying to imply that there was a significant difference?