Determine algebraic equations for the pump head rise,power, and efficiency as functions of flow rate based on the datafrom 12.18. Analytically determine the Best EfficiencyPoint and the BEP flow, head rise, and power. How do these valuescompare with those from 12.18?
How to Survey Public Opinion Campaigns and Elections - Why care about public opinion “What I want to get done is what the people desire to have done, and the question for me is how to find that out exactly.” -- Abraham Lincoln - How can we know - We could sample everyone ... - Perform censes once every 10 years. (U.S. Constitution) : Accurate in demographic and population growth of states. - 13 billion price tag - We could sample a small population (1000): Laws of Probability - Learning From Our Past - 1936 Postcard Poll (Literary Digest Poll) - Prediction: Landon 57% and Roosevelt 43% - Actuality: Landon 38% and Roosevelt 62% - Biased - Too early - 1948 Dewey Defeats Truman - Door to Door Survey - Poll predicted: Dewey 43% and Truman at 36% - Actual Vote: Dewey 45% and Truman 49% - Problems: - Polling stopped 2 weeks before election - Middle-class people were heavily over sampled - How to Read Polls Today - Confidence interval (95%) - Margin of Error +- (varies-usually 3%) - Dimensions of Polling - Direction: Can be Scaled - Intensity: Strong Feelings - Salience: How Important is the issue - Problems with Polls Today - Response rate - Wording artifacts - Survey Research: Framing the Question Public Opinion Political Socialization - Decent Sample - Time - Random Sampling - Selection Bias