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ashley erickson

ashley e.

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A risk ratio of 24.3 provides stronger evidence for causality than a risk ratio of 1.6. This is an example of which criterion for judging causality? A Biologic plausibility B Temporality C Replication D Strength of association

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A school district uses four different methods of teaching their students how to read. They want to find out if there is any significant difference between the reading scores achieved using the four methods. It creates a sample of 8 students for each of the four methods. The reading scores achieved by the participants in each group are as follows: Method 1 Method 2 Method 3 Method 4 51 82 79 85 87 91 84 80 50 92 74 65 48 80 98 71 79 52 63 67 61 79 83 51 53 73 85 63 54 74 58 93 Required: Complete the ANOVA tables below: SUMMARY Groups Count Sum Average Variance SS Method 1 â–¼ â–¼ â–¼ Method 2 â–¼ Method 3 â–¼ â–¼ Method 4 â–¼ â–¼ â–¼ â–¼ ANOVA Alpha 0.05 Source of Variation SS df MS F P-value F crit Between Groups â–¼ â–¼ â–¼ Within Groups Total

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3. Methyl ethyl ketone (MEK) is a polar organic solvent with chemical formula C4H8O and a normal boiling point of 80.0 °C. The vapor pressure of MEK is 100.0 torr at 25.0 °C. Calculate the expected Kelvin temperature at which the vapor pressure is expected to be 610.0 torr using the Clausius-Clapeyron equation at two temperature conditions. The enthalpy of vaporization for MEK is +34.1 kJ/mol. Show all your work. Using the information above for MEK, determine the vapor pressure in units of torr for MEK at a temperature of -15 °C.

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An external calibration curve was prepared by measuring the Absorbance from a fabric dye solution as a function the concentration of the fabric dye. The equation for the calibration curve is Absorbance=0.086C, where C is the concentration in units of ppm. Flask 1: A 20.00 mL aliquot of the unknown solution was diluted to 100.0 mL. The Absorbance was measured to be 0.231. Flask 2: A 20.00 mL aliquot of the unknown solution and 2.00 mL of a 100.0 ppm fabric dye solution were mixed and diluted to 100.0 mL. The Absorbance was measured to be 0.403. Calculate the %spike recovery for this sample. Report your answer to 1 decimal place.

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1. (8 pts) Given tan A = \frac{1}{2} with A terminating in QIII and cos B = \frac{2}{3} with B terminating in QIV, Find the exact values of: tanA = \frac{1}{2} x = 1 y = 2 cosB = \frac{2}{3} x = 2 r = 3 y = -1 a. sin A = _____ cos A = _____ sin B = _____ tan B = _____ b. cos(A - B) = _____ cos(A - B) = _____ c. sin(2A) = _____ sin(2A) = _____ d. tan(\frac{A}{2}) = _____

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6) Given $f(x) = \begin{cases} Mx^3, & \text{if } x < 2\\ Nx^2 - 16, & \text{if } x \ge 2 \end{cases}$, find the values for M and N so that the function is differentiable everywhere.

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The purpose of the Community Safety Education Act is to define the behavioral expectations of law enforcement and citizens during a traffic stop. TRUE FALSE

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(25%) Problem 1: A student is examining an ant with a magnifying glass. The student's near point is N = 24 cm from the eye and the magnifying glass has a focal length of f = 9.6 cm. show answer Incorrect Answer 25% Part (a) Write an expression for the angular magnification that the student observes, M1, when the image distance of the ant di = -63 cm.

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What disease is absent from the statistics for 1981-82 using the web 'Explore leading causes of death'? Using the most recent statistics, what age groups rank higher than fifteenth in deaths from this disease?

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12) Fiscal policy involves: a) government expenditures. b) determining exchange rates. c) interest rates. d) all of the above

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