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The number of credit cards carried by students can be modelled using the Poisson distribution. A sample of students generated the following data credits cards X 0 1 2 3 4 5 6 students with X credit cards 42 244 358 96 32 8 2 Find the sample size n, and hence the sample mean ¯X . Use this information to calculate a 95% confidence interval for the average number of credit cards carried by students.
1. For four observations, it is given that mean is 6, median is 4, and mode is 3. Find the standard deviation of this sample. 2. The data given below pertain to a random sample of disbursements of state highway funds (in millions of dollars), to di..
Below is the number of new cars sold at Sharkey in the last seven months and for the last eight months at Dave White. Do you agree with Mr. Sharkey? Use the .01 significance level."
a. construct 23 expiremental design. when the columns are arranged in ababcacbcabc what is the value of the row labeled
Assume that demand for services per period is Pt = 1000 - Qt where Qt is the stock of the durable consumed. Let the discount factor for both consumers and the firm be one.
an f-curve has df2430. in each case find the f-value that has the specified area to its right. draw diagrams to
If a technical assistant is randomly selected, what is the probability that she would like to have MAC, given that she would like to have a PC as well?
Determine how large a sample would be necessary to estimate the population proportion with a margin of error of .05 at 95% confidence
the depot is using a standard of 635 hours for a particular modification effort. you are to review the standard and
A raincoat manufacturer wants to know whether customers prefer any specific color over other colors in raincoats. He selects a random sample of 50 raincoats sold and notes the colors. At a = 0.10, is there a color preference for the raincoats?
The mean return on investment is 25 percent and the standard deviation 5.2 percent. Compare the relative dispersion for the price-earnings ratios and return on investment.
given independent random variables with the means and standard deviations below find the mean and standard deviation of
A patient is chosen at random from the clinic. What is the probability that the patient's test comes out positive for Lyme disease?
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