Average of the means
If a population has a standard deviation of 18, what is the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true mean?
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A mail order company has an 8% success rate. If it mails advertisements to 600 people, find the probability of getting less than 40 sales?
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation :75.
If np>5 and nq>or equal to 5, estimate P(more than 7) with n=11 and p=0.6 by using the normal distribution as an approximation to the binomial distribution; if np,5 or nq<5, then state that the normal approximation is not suitable.
Consider problem 5.71 (regarding telephone calls made independently of each other). Find an example through a web search of a similar problem, and explain why the example you chose uses independent random variables.
Assume that the heights of men are normally distributed with a mean of 68.7 inches and a standard deviation of 2.1 inches. If 36 men are randomly selected, find the probability that they have a mean height greater than 69.7 inches.
You wish to test the claim that u > 11 at a level of significance of ? = 0.05 and are given sample statistics n = 50, sample mean = 11.3 and standard deviation = 1.2 Compute the value of the test statistic. Round your answer to two decimal pla
List Ho and Ha (Note : Remember you are not testing the mean, so "Y" should not be used). Find the critical value(s). Find X(2), the standardized test statistic
Below is a table of observed values of sample comparing people's ages to their political affiliation. Construct the corresponding table of expected values for checking whether the variables are independent.
Suppose thw weekly amount spent on repairs at a certain computer is normally distributed with a mean of $300 and a standard deviation $20
A coffee machine delivers volumes of coffee into 8 oz. cups that are normally distributed having and known mean of 60z, but with a unknown standard deviation . It is also known that the cofee machine delievers volumes exceeding 8oz. 2% of the time
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