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1. In a sample of 400 ball bearings, the correlation coefficient between eccentricity and smoothness was r = 0.10.
a. Find the P-value for testing H0 : ρ ≤ 0 versus H1 : ρ> 0. Can you conclude that ρ> 0?
b. Does the result in part (a) allow you to conclude that there is a strong correlation between eccentricity andsmoothness? Explain.
2. The article " ‘Little Ice Age' Proxy Glacier Mall Balance Records Reconstructed from Tree Rings in the Mt. Wadding- ton Area, British Columbia Coast Mountains, Canada" (S. Larocque and D. Smith, The Holocene, 2005:748-757) evaluates the use of tree ring widths to estimate changes in the masses of glaciers. For the Sentinel glacier, the net mass balance (change in mass between the end of one summer and the end of the next summer) was measured for 23 years. During the same time period, the tree-ring index for white bark pine trees was measured, and the sample correlation between net mass balance and tree ring index was r = -0.509. Can you conclude that the population correlation ρ differs from 0?
Four Seasons Hair Salon is the only women's hair stylist in Lake View. A business consultant has estimated its monthly cost functions as follows: TC = 2000 + 80 Q + 0.05 Q 2 MC = 80 + 0.1 Q The firm is faced with the following demand: Qd = 800 - 4..
buy for 48,000.00 a parking lot. Revenues average 19,000.00 per year for the last 3 years. Annual gross revenue will increase by 10%. The 48,000.00 will come from an inheritance which is currently earning 4.25% interest compounded annually.
A math test of 100 questions was given to a random sample of 20 freshman. Suppose that for the population of freshman the distribution of number of correct answers would be normal with a variance of 250. a) what is the probability that the sample v..
In the Barro-Ricardo view, does it make any difference whether the government pays for its expenditures by raising taxes or issuing debt?
The revenue and cost functions for producing and selling quantity x for a certain production facility are given below. R(x) = 16x - x2 C(x) = 20 + 4x a) Determine the profit function P(x). b) Use Excel to graph the functions R(x), C(x) and P(x) for t..
Complete the table. What is the marginal propensity to save? What is the marginal propensity to consume?
consider the production function flk l k.a. suppose k is fixed at 2. find algebraic expressions for the total product
Don Ball is a 55-year-old engineer. According to mortality tables, a male at age 55 has an average life expectancy of 21 more years. Don has accumulated $48,500 toward his retirement. He is now adding $5000 per year to his retirement fund. The fun..
Once you have posted your assignment, read and respond to at least one other student's posting. Provide feedback to the student on how he/she addressed each of the areas.
Suppose now that the demand for electricians increases to 70- 3N. Assume the market is subject to cobwebs. Calculate the wage and employment level in the first 4 rounds as the wage andemployment levels adjust to the demand shock.
In 2010, many unskilled workers in the United States earned the federal minimum wage of $7.25 per hour. By contrast, average earnings in 2010 were about $22 per hour, and certain highly skilled professionals, such as doctors and lawyers.
A manufacturing company leases a building for $100,000 per year for its manufacturing facilities. In addition, the machinery in this building is being paid for in installments of $20,000 per year. Each unit of the product produced can be sold for ..
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