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The director of philanthropy at the Fleckman Institute of the Arts is interested in assessing the impact that recent changes in federal tax laws have had on donations. The average donor gave $580 last year. A random sample of 50 donations reveals that in the 5 months since the laws were changed, the average donor gave $625, with a standard deviation of $97. Present a hypothesis and a null hypothesis, and evaluate them. What can the director conclude about the effect the new tax laws are having on donations?
a researcher has found that pilots taking an over the counter antihistamine have poor reaction times. they performed an
Based on NSC estimates, companies with 50 employees are expected to average three employee off-the-job accidents per year. What is the probability of at least two off-the-job accidents during a one year period?
It is possible to use a sample to estimate a population parameter with 100% accuracy? Explain.
A set of data is normally distributed with a mean of 3.5 and a standard deviation of 0.6. State whether the first area is bigger, the second area is bigger.
A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error?
Find the best predicted pulse rate of a woman who is 65 in tall. Use a significance level of a=0.01
Assuming a linear relationship between sales and years of experience f a salesperson, asc the least-squares method to find the regression coefficients. b0 and b1.
if the standard deviation for a population as estimated from a sample is s 5.6 then the standard error for a sample
Create an example of an application oriented binomial experiment. You are to give the scenario which should include an "n" and "p".
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find a 99% confidence interval for µ, the mean annual salary of al..
What is this type of sample called?- Do you think the results of these polls represent the opinions of all readers of the magazine? Explain.
At the .01 significance level, is there a difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
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