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It is reported that the time married men with children spend on child care averages 6.5 hours per week. You belong to a professional group on family practices that would like to do its own study to determine if the time married men in your area spend on child care per week differs from the reported mean of 6.5 hours per week. A sample of 40 married couples will be used with the data collected showing the hours per week the husband spends on child care. The sample data are contained in the file ChildCare. 7.3 6.5 7.7 5.8 3.6 9.7 6.2 8.7 11.4 0.6 8.2 7.2 9.4 7.5 5.4 8.0 9.4 4.5 7.5 7.9 5.8 7.6 8.3 9.8 9.0 6.2 4.7 0.6 11.2 8.3 9.0 7.9 7.0 6.3 3.8 8.1 7.0 7.6 2.3 7.0 (a) What are the hypotheses if your group would like to determine if the population mean number of hours married men are spending in child care differs from the mean reported in your area? Ο $H_0: \mu > 6.5$ $H_a: \mu \le 6.5$ Ο $H_0: \mu \le 6.5$ $H_a: \mu > 6.5$ Ο $H_0: \mu \ge 6.5$ $H_a: \mu < 6.5$ Ο $H_0: \mu < 6.5$ $H_a: \mu \ge 6.5$ Ο $H_0: \mu = 6.5$ $H_a: \mu \ne 6.5$ (b) What is the sample mean in hours per week? hours per week What is the test statistic? (Round your answer to three decimal places.) What is the p-value? (Round your answer to four decimal places.) p-value (c) Most researchers would choose $\alpha = 0.10$ or less. At $\alpha = 0.10$, what is your conclusion? Reject $H_0$. There is insufficient evidence to conclude that that the population mean number of hours married men with children in your area spend on child care differs from the reported mean of 6.5. Reject $H_0$. There is sufficient evidence to conclude that that the population mean number of hours married men with children in your area spend on child care differs from the reported mean of 6.5. Do not reject $H_0$. There is sufficient evidence to conclude that that the population mean number of hours married men with children in your area spend on child care differs from the reported mean of 6.5. Do not reject $H_0$. There is insufficient evidence to conclude that that the population mean number of hours married men with children in your area spend on child care differs from the reported mean of 6.5.

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A rescue helicopter lifts a $ 79-\mathrm{kg} $ person straight up by means of a cable. The person has an upward acceleration of $ 0.70 \mathrm{~m} / \mathrm{s}^{2} $ and is lifted from rest through a distance of 11 m . (a) What is the tension in the cable? How much work is done by (b) the tension in the cable and (c) the person's weight? (d) Use the work-energy theorem and find the final speed of the person.

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8. What is a sublimation? (5 points)

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How effective is it to request that Mark, who has been on the team for 2 months, helps you?

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8.25 *** [Computer] Consider a particle with mass m and angular momentum $l$ in the field of a central force $F = -k/r^{5/2}$. To simplify your equations, choose units for which $m = l = k = 1$. (a) Find the value $r_0$ of $r$ at which $U_{eff}$ is minimum and make a plot of $U_{eff}(r)$ for $0 < r \le 5r_0$. (Choose your scale so that your plot shows the interesting part of the curve.) (b) Assuming now that the particle has energy $E = -0.1$, find an accurate value of $r_{min}$, the particle's distance of closest approach to the force center. (This will require the use of a computer program to solve the relevant equation numerically.) (c) Assuming that the particle is at $r = r_{min}$ when $\phi = 0$, use a computer program (such as \"NDSolve\" in Mathematica) to solve the transformed radial equation (8.41) and find the orbit in the form $r = r(\phi)$ for $0 \le \phi \le 7\pi$. Plot the orbit. Does it appear to be closed?

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You are treating a semi-responsive hypotensive patient who is vomiting blood. What position would be best to put him in? 1. In high Fowler's position 2. Supine with the legs elevated six inches 3. Left lateral recumbent with legs slightly elevated 4. Right lateral recumbent with legs slightly elevated

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Part B Can you match these prefixes, suffixes, and word roots with their definitions? -phob from, out of, remove: de to love: proto- water: -phil lip- fat: ad of neither gender or type: neut- first: -lysis hydro- to fear to loosening, split apart Submit Request Answer < Return to Assignment Provide Feedback Reset Help

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23. What is the probability that your search time is between 455 and 485 seconds? a. .04 b. 24 c. 31 d. .69 24. Suppose you can receive a parking refund if your search time is in the top 2.5% of the

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Which set of data is represented in the box and whisker

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In wind turbines, the ratio Pshaft/Pwind of the power available at the shaft to the power in the wind is called the Coefficient of Performance, Cp, which is a unit-less quantity. For informational purposes, the plot of this coefficient, as a function of X, is shown in Figure P1-5 [9] for various values of the blades pitch-angle Î¸, where X is a constant times the ratio of the blade-tip speed and the wind speed. The rated power is produced at the wind speed of 12 m/s where the rotational speed of the blades is 20 rpm. The cut-in wind speed is 4 m/s. Calculate the range over which the blade speed should be varied between the cut-in and the rated wind speeds to harness the maximum power from the wind. In this range of wind speeds, the blades pitch-angle is kept at nearly zero. Note: this simple problem shows the benefit of varying the speed of wind turbines, by means of a variable-speed drive, for maximizing the harnessed energy.

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jeremiah r.