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Allen is an appliance salesman who works on commission. A random sample of 39 days showed that the sample standard deviation value of sales was s = $215. How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x ?
what is the probability that a single fisherman's catch is less than 31.5 pounds? what is the probability that the sample of 30 fisherman's average catch is less than 31.5 pounds?
In a random sample of 184 college students, 97 had part-time jobs. Find the margin of error for the 95% confidence interval used to estimate the population proportion.
Suppose that 0.6 of the present 25,000 vehicle occupants killed in collisions were not wearing seat belts. There are about 170 million registered cars and trucks on the highway today.
The probability is 90% that the sample percentage is contained within what symmetrical limits of the population percentage?
A study of 20 families in a certain large city showed that the average income was $33,210 in 2000 with a standard deviation of $1800. Test the hypothesis that the true average income in this city was actually $31,000 against the hypothesis that it..
Generate survival times X from an exponential distribution with rate lambda=1 with a censoring distribution C being exponential with rate theta = 2/3. Then Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000..
Provide one example in the accounting department that you can apply a contingency table to. Briefly explain how a contingency table can be useful.
Define probability and explain the three perspectives. Provide an example of each. Describe the difference between subjective and probabilistic sampling methods. What are the advantages and disadvantages of each?
Construct a 95% confidence interval estimate of the difference in kilometers per liter. Do the results of parts (a) and (b) agree? Explain why or why not.
Data on distribution of cost for building effort, design work and testing effort.
Given that the mean of 100 observations is 42.5 and that their standard deviation is 6.313, find the sum of the squares of the observations.
They became ________ likely to underperform on aptitude tests and ________ likely to become aggressive toward someone who had insulted them.
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