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A sample of 100 people is classified by gender (male/female) and by whether or not they are registered voters. The sample consists of 80 females and 20 males, and has a total of 60 registered voters. If these data are used for a chi-square test for independence, what is the total number of females for the expected frequencies?
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Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine.
Two chi-square distributions were plotted on the same chart. One distribution was for 3 degrees of freedom and the other was for 12 degrees of freedom. Which distribution would tend to approach a normal distribution?
A mean of 2000 pounds and a variance of 2500 pounds. Let X be the mean of any sample of 100 ropes selected at random. find the expected value and the standard error of X.
assume the duration of human pregnancies can be described by a normal model with mean 266 days and standard deviation
Find a 95% confidence interval for the mean weight of the population of all such runners, assuming that the population standard deviation is o=4.5 kg. Based on the confidence interval, does a test of Ho: u=61.3kg, Ha: u =/ 61.3kg
Create the 99% confidence interval on difference of average ages for viewers of the two TV programs. How can you interpret interval?
Construct the following confidence intervals for your data set:
What are the main difference between the frequency distribution of continuous data and discrete data and how would you present a continuous data as though discrete?
Let Y be the number of envelopes for which the machine fails to remove a check. Using the Central Limit Theorem to approximate P{Y≤10}.
question a night time cold medicine bears a label indicating the presence of 600 mg of acetaminophen in each fluid
The production department wants to explore the relationship between the number of employees who assemble a subassembly and the number produced. The complete set of paired observations follows:
q1. consider an investment portfolio of 50000 in stock a and 50000 in stock b. the expected value of a is 9.5 and b is
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