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# ECON 15B Study Guide - Midterm Guide: Null Hypothesis, Test Statistic, Standard DeviationExam

Department
Economics
Course Code
ECON 15B
Professor
Paul Shirey
Study Guide
Midterm

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NAME: _________________________________ I.D.: _____________________________________
TEST TWO
PROBABILITY AND STATISTICS, ECON 15B
JULY 6, 2018
YOU MUST SHOW ALL YOUR WORK!
1. In 1968, Doob and Gross studied perceived social status. They found that if an old, beat-up (low-status) car failed to start when a
traffic light turned green, 84% of the time the driver in the car behind them honked the horn. However, when the stopped car was an
expensive, high-status car, only 50% of the time the driver behind them honked the horn. If Type I Error was made, what was concluded
and what was true. (Say something like, They concluded that _____________, but in reality _____________.” Fill in the blanks with
statements about the experiment, not generic statements that can apply to any experiment.)
2. Continuing with the above experiment: If Type II Error was made, what was concluded and what was true. (Say something like,
“They concluded that ________________, but in reality, we have _________________.” Fill in the blanks with statements about the
experiment, not generic statements that can apply to any experiment.)
3. As evidence against the null hypothesis being true increases, what happens to the test statistic?
4. As evidence against the null hypothesis being true increases, what happens to the p-value?
5. In the case of Joe, the slow tapper, do you think it would be better to have a large significance level or a small significance level?