1. Assume that adult height is a normally distributed variable in the population, and that mean height is 170cm and the standard deviation of adult height is 10cm.

1. What percentage of the adult population are taller than 190cm?
2. What is the 75th percentile of adult height?
3. What percentage of adults are between 160cm and 165cm?

2. The file fertility rate 2014.csv is the fertility rate (in live births/woman) for all countries in the world (data from the World Bank) for the year 2014. Find the mean, median, 90th and 10th percentiles, inter-quartile range, standard deviation. Interpret each of these quantities (i.e., write a 1 sentence explanation of what each quantity means).

3. Justin Trudeau is running for re-election. In the lead-up to an election, a polling company conducts a poll of 2,000 likely voters. It finds that 35% of them support Trudeau. What is the standard error associated with the poll result? What is the 95% confidence interval? Explain in 1-2 sentences what each of these concepts mean.

4. Teacher absenteeism is a problem in Indian schools, and various solutions to the problem have been proposed. Duflo, Hanna, and Ryan (2012) test the effect of monitoring on teacher absenteeism (by putting cameras in classrooms). Before cameras are installed, it is known that teachers are present in classrooms for 6.5 hours per day on average. Cameras are installed in 50 randomly-selected classrooms, and teacher presence in those classes increases to 6.8 hours/day, with a standard deviation of 0.5 hours/day. Is there sufficient evidence to conclude that the program is effective (i.e., does it reduce teacher absenteeism?) with 95% confidence? Explain your reasoning.

5. For one of the following claims: think of a variable that could be used to measure the underlined concept; find data (on the Internet; I have provided some suggested resources to get you started; feel free to explore others) corresponding to the variable; create a properly-labeled figure that shows worldwide trends in the variable over time (e.g., going back 20-30 years or so)

1. The world is more violent than it used to be. (Uppsala Conflict Data Program)
2. Human rights around the world are in decline. (CIRI Human Rights Data Project)
3. The world is becoming less democratic. (Systemic Peace Polity5 Annual time series)
4. The world is becoming more unequal. (World Bank)

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Solution: The downloadable solution consists of 5 pages, 898 words and 2 charts.
Deliverable: Word Document