BEC1 Study guide – Updated (please discard any other study guide currently in your possession and replace it with this one) – only 33 pages. Yah!! Introduction (Chapter 1 – Munro e-book) Know the definition of population‚ sample‚ parameter‚ & statistic Be able to identify and/or provide examples of descriptive statistics & inferential statistics Know the properties of & be able to identify or provide examples of quantitative vs. categorical variables Basic Concepts (Chapter 2 – Munro
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Pendulums and Gravity Ashu Mishra B2 Physics Pooja‚ Logan Meyer Please read #’s 1-8 before you read the bottom section 1. 2. 3. 4. 5. 6. 7. 8. 9. formula for solving the period of a pendulum 10. derivation from #9 to solve for gravity The gravity is inversely proportional to the period Number 5 shows that if there is more gravity and everything else is constant then angular acceleration increases which can be assumed to reduce the period therefore gravity is inversely proportional
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estimate the median and quartiles. 1st quartile: Q1 about 167cm Median: about 170 cm 3rd quartile: Q3 About 174cm Estimated from the graph. 7. What is the inter-quartile range? Inter-quartile range: IQR=Q3-Q1=174-166=7cm 2015/6/2 !2 GAC010 AE2 Louis ID 8. Box plot 160 165 170 175 180 9. Find the mean and standard deviation (sd) ! (X − µ )2 = 6.5 !σ = 20 2015/6/2 !3 GAC010 AE2 Louis ID 10. Calculate the Pearson measure of Skewness (modal version)‚ and the Quartile measure of skewness
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NBER WORKING PAPER SERIES TECHNOLOGY’S EDGE: THE EDUCATIONAL BENEFITS OF COMPUTER-AIDED INSTRUCTION Lisa Barrow Lisa Markman Cecilia E. Rouse Working Paper 14240 http://www.nber.org/papers/w14240 NATIONAL BUREAU OF ECONOMIC RESEARCH 1050 Massachusetts Avenue Cambridge‚ MA 02138 August 2008 We thank the many dedicated principals‚ teachers‚ and staff of the school districts that participated in this project as well as Gadi Barlevy‚ Thomas Cook‚ Jonas Fisher‚ Jean Grossman‚ Brandi Jeffs‚ Alan
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automatic pipette. 4. After all of the weights of water have been recorded from each pipette‚ convert them into units of volume (µl)‚ taking the temperature into consideration. 5. Record all of the units into a table and calculate the mean‚ standard deviation and the standard error of the mean for each set of results. (3) Results: Room Temperature = 24oC Density of Water = 0.997296 Gilson P1000 - Weight of cup before experiment = 0.9054g Adding 1ml each time 1.0093g 2
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mpg‚ with a standard deviation of 6 mpg. -3σ - 2σ -1σ μ 1σ 2σ 3σ 1. Sketch the Normal model (label). 68% 95% 99.7 % 2. What percent of cars get less than 15 mpg? 15 24 z 1.5 P(y<15)=P(z<-1.5)=6.7% 6 12 18 24 30 36 42 6 3. What percent of cars get between 20 and 30 mpg? 20 24 30 24 P(20<y<30)=P(-0.67<z<1)=58.8% z .67 z 1 6 6 4. What percent of cars get more than 40 mpg? 40 24 z 2.67 P(y>40)=P(z>2.67)=0.4% 6 5. What gas mileage represents the third quartile? y 24 Q375% using
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precise and more accurate within a standard deviation of + 0.06 g/cm^3‚ where water displacement method had a standard deviation of + 0.15 g/cm^3. Graph #2 shows the error was greater according to water displacement method when measuring the initial and final volume’s displaced with a standard deviation of + 2.0 g/cm^3. The average calculated density of the regular shaped objects compared to the graphical determination were within + 2g/cm^3 standard deviations. The accuracy and precision‚ when comparing
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to 36 students to see if the attitudes of students toward the mentally ill would change. The results of the class of 36 that watched the film had a score of 70. The results of the class that did not watch the film had a score of 75. The standard deviation is 12. When the alpha is set to 0.05. .05 is a mid-probability. It means we’re using to reduce the likelihood of errors. It means there is a 5% chance that an error may occur. These errors usually will lead to the rejection of the null hypothesis
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We then recorded those values. 3.We found the mass of a standard mass on the balance pan. We recorded the mass as accurately as was allowed by the balance. 4.We moved the smallest counterweight over slightly until there was the slightest deviation from the zero point. We recorded that value. Then‚ we moved the counterweight in the opposite direction. We recorded that value. 5.We measured and recorded the mass of each of the two objects of unknown mass. We added those values to the class
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Accuracy improvement method of eddy current sensor Qiaoyun Liu1‚2‚ Enming Miao1‚2#‚ Xin Wang1‚2‚ Xianrui Ji1‚2 1School of Instrument Science and Opto-electronics Engineering‚ Hefei University of Technology‚ Hefei Anhui‚230009‚China 2State Key Laboratory for Manufacturing Systems Engineering(Xi’an Jiaotong University)‚ Shanxi‚710049‚China #Corresponding Author : miaoem@163.com‚ TEL: +86-14705511579 KEYWORDS:Eddy Current Sensor; Error Correction; Least Squares Abstract Eddy current sensor
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