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Spam mail percentages. The National Technology Readiness Survey sponsored by the Smith School of Business at the University of Maryland surveyed 418 randomly sampled Americans, asking them how often they delete spam emails. In 2004, 23% of the respondents said they delete their spam mail once a month or less, and in 2009 this value was 16%.
(a) What are the hypotheses for evaluating if the proportion of those who delete their email once a month or less has changed from 2004 to 2009?
(b) What is the point estimate for the difference between the two population proportions?
(c) A report on the survey states that the observed decrease from 2004 to 2009 is statistically significant. Explain what this means in context of the hypothesis test and the data.
(d) Would you expect a confidence interval for the difference between the two population proportions to contain 0? Explain your reasoning.
A conical paper cup is to have a height of 15 inches. Find the radius of the cone that will result in a surface area of .
A wheel of radius 2 feet begins moving down a ramp of height 6 and length 24 feet , turning at 23 revolutions per minute clockwise as it does. At time t = 0 the point P on the wheel is at [0, 6]
HOME FINANCING If the loan is amortized over 15 yr: What monthly payment will the Turners be required to make?
Let B(r,t) compute the balance (in dollars) of account after t years with an r% interest rate. What are the units of dB/dr? (dB/dr is in partials notation)
Prove that a matrix A is invertible if and only if zero is not an eigen value of A.
The first entry in the product Ax is a sum of products.
Around January 1, 1993, Barbra Streisand signed a contract with Sony Corporation for $2 million a year for 10 years. Suppose the first payment was made.
Construct a 99% confidence interval for the population mean total fat, in grams per serving.
Define the variables, determine the slope and vertical intercept, and write an equation to model this data and evaluate the table of values of earning using the given data.
Bienestar company produces two types of get well cards scented and regular drivers for the four activities are as follows.scented cards,regular cardsinspection.
You just had a baby and want to invest for his college tuition. You found two different accounts: In account one you have to invest $2500 at 2% compounded monthly.In account two, you have to invest $2000 at 4% compounded annually. If you predict t..
Two stations P and Q are 110 km apart on a straight track. One train starts from P at 7 a.m. and travels towards Q at 20 kmph. Another train starts from Q at 8 a.m. and travels towards P at a speed of 25 kmph. At what time will they meet?
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