Warm Up An experiment was run to test the effectiveness of using a computer program to teach Algebra to middle school students. A group of 20 students was randomly selected to use a computer program to supplement their learning. At the end of the year these students took an Algebra benchmark test and scored a mean of 78 points with a standard deviation of 6. Historically students at this middle school score a mean of 75 points on the test. Assume the conditions for inference are met. Is the computer program effective in helping students learn Algebra? Explain why or why not. (Hint: Calculate the confidence interval)

AP Test Signup Make checks payable to Leland High School. Put student’s name on the check. No credit/debit cards. You can sign up for all your tests together. If you sign up in another class that is ok, just let me know. Each test costs $94 (AP Capstone is $142), but if you applied for free and reduced lunch this year the test cost is $5.

Practice State an appropriate null and alternate hypothesis. Clearly define the population and parameter of interest. 1) The manufacturer of M&Ms claims 22% of plain M&Ms are red. You take a sample of M&Ms to test this claim. 2) A fast food restaurant can get customers through their drive through line at lunch in an average of 8.5 minutes. A manager believes she has an improved system to reduce this time. 3) A 2009 study says that 67% of U.S. teens update their Facebook page once a week. You want to determine if the rising popularity of other social network sites has reduced this value.