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In an article about the cost of health care, Money magazine reported that a visit to a hospital emergency room for something as simple as a sore throat has a mean cost of $328 (Money, January 2009). Assume that the cost for this type of hospital emergency room visit is normally distributed with a standard deviation of $92. Answer the following questions about the cost of a hospital emergency room visit for this medical service.
What is the probability that the cost will be more than $500? (to 4 decimals)
What is the probability that the cost will be less than $250? (to 4 decimals)
What is the probability that the cost will be between $300 and $400? (in inches, to 4 decimals)
If the cost to a patient is in the lower 8% of charges for this medical service, what was the cost of this patient's emergency room visit? (to 2 decimals) how do you get z= -1.40507? I can end up with the same answer for D with a calculator but I would like to know how you obtained this number so that i can do it by hand if calculator decides to not work.
Suppose the population standard deviation is unknown. If 71% of all sample means are greater than 49 hours and the population mean is still 50.4 hours, what is the value of the population standard deviation?
Would it be reasonable to conclude that the population distribution is Poisson with a mean of 2.0?
urn 1 has 5 red and 7 blue balls and urn 2 has 6 red and12 blue balls. pick 3 uniformly and randomly from each of the 2
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 16. At alpha = 0.05 is there enough evidence to reject the researche..
Second treatment had M = 52 with s^2 = 36. Do these data point to significant difference between two treatments? Use the two-tailed test with α = .05.
Give a point estimate for the difference between the proportion of college-aged women and the proportion of college-aged men who are registered to vote.
If the sample standard deviation is s=10, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with a critical value of .05?
If the population standard deviation is σ = 10, can you conclude that the treatment has a significant effect? Use a two-tailed with α = .05.
The distribution of sample mean for samples of 500 homes is normal with a mean of 2.64 and a standard deviation of 0.06. Suppose you select a random sample of n=500 homes and determine that the mean number of people per home for this sample id 2.5..
Supposing a linear relationship, use the least squares method to find the regression coefficients b 0 and b 1 .
A sample of size n = 14 is selected from a normal population to construct a 95% confidence interval estimate for a population mean. The interval was computed to be (7.82 to 9.64). Determine the sample standard deviation.
The mean numbers of trials to learn maze for the group with the colrful wallpaper is 11. What is the standard deviation of the distribution of means?
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