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A researcher is interested in the size of the current balance of credit card holders. To estimate this, he obtains the size of the current balance of a random sample of 25 credit card holders. A 90% confidence interval for the mean current balance of credit card holders is found to be $662.72 +or- $44.70. Which of the following would produce a confidence interval with a smaller margin of error than this 90% confidence interval?
Consider the simple linear regression model without an intercept, y = ß1x + u, with the assumption E(u|x)=0. Also assume that E(x)=0 Show that E(y)=0 and using this as well as E(x)=0 show that the covariance between x and y is given by E(xy) and that..
Because people dislike commuting to work, homes closer to employment centers tend to be more expensive. The price of a home in a given employment center is $60 per day. The daily rental price for housing drops by $2.50 per mile for each mile farth..
determine how much money would be in a savings account that started with a deposit of $2000 in year 1 with each succeeding amount increasing by 15% per year. use an interest rate of 10% per year and a 7-year time period.
consider a modified scenario where a potential worker invests in years of education. Each year of education costs a motivated worker $10,000 in terms of disutility and an unmotivated worker $20,000 in terms of disutility.
the demand for its product comes from two types of customers, I and II. Each type I customer (there are 25 of them) has a demand curve given by Q=12-P, while each type II customer (there are 30 of them) has a demand curve given by Q=9-P.
The per-unit cost of an item is its average total cost (= total cost/quantity). Suppose that a new cell phone application costs $150,000 to develop and only $0.5 per unit to deliver to each cell phone customer. What will be the per-unit cost of th..
How should the food be allocated if they want to maximise their use/utility If person no. 2 needs a utilitylevel of at least 5 to survive, how should the food be allocated if they still want to maximise their use, without letting person no. 2 die.
a road between fairbanks and Nome, alaska, will have a most likely construction of $4 million per mile. Doubling this cost is considered to have a probability of 30%, and cutting it by 25% is considered to have a probability of 10%. the states int..
Labor Supply a. Ann's utility can be represented by the function: U (C,L) = ln (C-10) + 3/5 ln(L). She has 16 hours/day to divide into work (H) and leisure (L). She has no unearned income. Derive the formula for her Marginal Rate of Substitution a..
England and Scotland both produce scones and sweaters. Suppose England can produce 50 scones per hour or 1 sweater per hour. Suppose Scotland can produce 40 scones per hour or 2 sweaters per hour. Before trade England produces 25 scones and 0.5.
the production function: Q=5KL the assembly machines, K, costs $10,000 a week, while labor teams, L, cost $5000 per week. your plant has 4 assembly machines In the short run, ____ labor teams are required to produce 360 widgets.
Assume that the country is in a period of high unemployment, interest rates are at almost zero, inflation is about 2% per year, and GDP growth is less than 2% per year. Suggest how fiscal and monetary policy can move those numbers to an acceptable..
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