1. 1-True or False (0.5 points each / 3 points)

1. ___ A p-value can exceed 1.00.
2. ___ A value of 0.05 or 5% is typically used to define differences that are statistically significant.
3. ___ A low p-values often indicate your sample findings are not consistent with the null hypothesis.
4. ___ A 95% confidence interval is narrower than a 90% confidence interval for the same data set.
5. ___ When confidence intervals do not overlap, the difference between groups is statistically significant.

2-Sandra is studying the effectiveness of her whooping cough vaccination campaign in her city with a population of 8,000 people. From Jan 1st - Dec 31st 2015 2,200 people get vaccinated. From Jan 1st - Dec 31st 2016 an additional 3,700 people decided to get vaccinated. 800 people had already been vaccinated before the study began. What is the prevalence of people who had been vaccinated (also known as vaccine coverage) on the following dates?

Jan 1st, 2015?

Jan 1st 2016?

Dec 31st 2016?