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MAS291 - Lý Ánh Dương
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In the 2012 presidential election, exit polls from
the critical state of Ohio provided the following results:
What is the probability a randomly selected respondent voted
for Romney?
Suppose that samples of size n = 25 are selected at
random from a normal population with mean 100 and standard
deviation 10.
What is the standard error of the sample mean?Suppose that X has an exponential distribution with a mean of 10.
Determine the following probability P(X < 15 | X > 10).
How large must the sample be if you wish to be at least
95% confident that the error in estimating p is less than
0.1, regardless of the true value of p?
Let z0.025 = 1.96; z0.05 = 1.65.The dollar value of orders placed at a particular Website is found to be normally distributed with a standard deviation of $21.00. A sample of 32 orders averaged $78.25. What is the 90% confidence interval around this mean?
The following sample was taken from a normally distributed population: 15, 22, 10, 15, 11, 17, and 8. Calculate the 95% confidence interval for this sample.
Given that t(0,025; 6)=2,4469
When estimating the population mean from a normal population with unknown variance, the t distribution may be used with ______ degrees of freedom.