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laura gomez

laura g.

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Which prominent American writer owned the land that Thoreau lived on? Ralph Waldo Emerson Robert Frost Emily Dickinson Walt Whitman

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An object of mass $m$ is attached to a horizontal spring, stretched to a displacement $A$ from equilibrium and released, undergoing harmonic oscillations on a frictionless surface with period $T_0$. The experiment is then repeated with a mass of $4m$. What's the new period of oscillation? $T_0/2$ $T_0$ $2T_0$ $T_0/4$

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4. The forces exerted on the wheels of an airplane by the runway are shown in the illustration below. Find the resultant of the three forces and locate the point where its line of action intersects the xy-plane.

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No errors were found in the text.

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Q1. What is the sampling distribution? Would the sampling distribution of the median be normally distributed for the following distribution? Why or why not? 70 60 50 Frequency 40 30 20 10 0 11-20 21-30 31-40 41-50 51-60 61-70 71-80 81-90 91-100 Q2. What happens to the standard error of the sampling distribution as we increase sample size? Why? Q3. What is the relationship between standard error and certain that the mean we observed in our sample is close to the population mean? Why? Q4. A team of researchers is investigating the sleep patterns of adults in a city. The average nightly sleep duration for the entire adult population is µ = 7 hours, with a standard deviation of a = 1 hour. The researchers randomly select a sample of 150 adults for their study. What is the probability that the average nightly sleep duration for the researcher's sample of 150 adults will be between 6 and 7.5 hours? Remember to use standard error in your z-score calculation (mean/(sd/sqrt(n)))

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7) Using the following equation to do simple algebra, obtain and record an equation in which wavelength is "y" and period is "x" and v = Xf = 4T.

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Problem 02: 7-23 In 2001, the United States produced 51 percent of its electricity in the amount of $1.878 \times 10^{12}$ kWh from coal- fired power plants. Taking the average thermal efficiency to be 34 percent, determine the amount of thermal energy rejected by the coal-fired power plants in the United States that year.

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6. For this question, use the regression model from 5(c) to generate your forecasts. (Run the regression in 5(c) again to be sure it is the most recent regression you have run.) As you complete each step of the data entry, I suggest you use the following code (as a single line) to check your work: list year median_real_rent avg_real_wage housing_stock employment 1n_avg_real_wage 1n_employment In_housing_stock in -6/L a. Report the code to expand the dataset to add two more blank observations. b. We are going to generate two different hypothetical forecasts for 2018. Report a single line of code to enter 2018 as the year for both of these new observations. c. Perform the following steps. (Do not report your code. These steps are not graded.) i) Enter $75,000 as the average real wage for both observations. ii) Enter 730,000 as the total employment for both observations. iii) Enter 400,000 as the housing stock for observation 113. iv) Enter 450,000 as the housing stock for observation 114. v) Update the variable 1n_avg_real_wage for both observations. vi) Update the variable 1n_employment for both observations. vii) Update the variable In_housing_stock for both observations. d. Report the code to generate the predicted values of In_median_real_rent. Call your new variable for these predicted values 1n_mrr_hat. e. Undo the log-transformation of In_mrr_hat to generate the predicted levels of median real rent for observations 113 and 114. Report these values; do not report your code. Round to the nearest dollar.

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A curve given parametrically by $(x, y, z) = (-1 - 2t, -2 + t^2, -2t - 2t^3)$. There is a unique point $P$ on the curve with the property that the tangent line at $P$ passes through the point $(-3, -2, 6)$. The point $P$ has coordinates

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Problem 14.67 Design an active lowpass filter with dc gain of 0.25 and a corner frequency of 500 Hz.

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