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Test whether there is difference between two population mean
Paramedics in a large city say they need more staff at night because they get more emergency calls then. A random sample of 7 nights showed that the paramedics received the following numbers of emergency calls during the night: 72, 81, 85, 80, 88 82, 56. A sample of 7 different days showed that the paramedics received the following numbers of emergency calls during the day: 65, 54, 81, 67, 75, 83, 79.
1. State the random variables and means in words.
2. Use a 1% level of significance to test the claim that there are more calls during the night than in the day.
Indicate which would be the independent variable and which would be the dependent variable in each of the following:
The mean of a normal probability distribution is 60; the standard deviation is 5.
Conduct the hypothesis test and compute the p-value. At a 0.05 level of significance, what is your conclusion?
If a worker is chosen at random, what is the probability that he or she.Is very improbable to switch jobs. Is somewhat likely or very likely to switch jobs.
Confirm whether given random variable is binomial distribution or not. If this experiment is finished with replacement, explain why.
Supposing that the entire $10,000 can be spent on tires (ignoring other costs), and that the true fraction that will fail is approximately .05, can NHTSA attain its goal while staying within the budget? Describe.
Assuming that these are a random sample of all publicly traded companies, construct a 95 % confidence interval for the overall noncompliance proportion.
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
Consider the following situation describing layoffs at a manufacturing plant of the Monsanto Company. Does there appear to be a case of age discrimination between those laid off and those non-laid off?
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
Recent studies have shown that the super-cooling temperature of terrestrial frogs frozen at -6°C has a relative frequency distribution with a mean of - 2°C and a standard deviation of 0.3°C (The first of these studies was reported in Science, May ..
Select a US citizen and a citizen of China at random, independently of one another. Determine the probability that both have type O blood?
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