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Over the past several months, an adult patient has been treated for tetany (severe muscle spasms). This condition is associated with an average total calcium level below 6 mg/dl. Recently, the patient's total calcium tests gave the following readings (in mg/dl). Assume that the population of x values has an approximately normal distribution.
9.1 9.6 10.5 9.3 9.4 9.8 10.0 9.9 11.2 12.1
(a) Use a calculator with mean and sample standard deviation keys to find the sample mean reading and the sample standard deviation s. (in mg/dl; round your answers to two decimal places.)
x¯ = ________mg/dl
s = ________ mg/dl
(b) Find a 99.9% confidence interval for the population mean of total calcium in this patient's blood. (in mg/dl; round your answer to two decimal places.)
lower limit = ________ mg/dl
upper limit = ________ mg/dl
A catalog sales company promises to deliver orders placed on the Internet within 3 days. Follow up calls to a few randomly selected customers show that a 95% confidence interval for the proportion of all orders that arrive on time is 88% ; 6%. Wha..
1. Statoil managers claim that their company no longer prepares a budget. What do they mean by that claim? 2. Why did Statoil decide to abandon budgeting? 3. Describe the new processes that Statoil implemented to replace the budget. What are its stre..
What kind of data would be helpful in populating a data system?
A 2005 survey of Internet users reported that 22% downloaded music onto their computers. The ?ling of lawsuits by the recording industry may be a reason why this percent has decreased from the estimate of 29% from a survey taken two years before.
This result applies no matter what the shape of the probability distribution from which the samples are taken. Central Limit Theorem: How Large a Sample?
the population mean of monthly wages of all college graduates under age of 30. Interpret your answer in the context of the problem.
(a) Define the parameter to be tested. (b) What is the null hypothesis (H0)? What is the alternative hypothesis (H1)?
A two-standard-deviation interval is called the margin of sampling error (or the margin of error or the sampling error) by most pollsters.
What proportion of these components will fail within 30 days?- What is the expected life of the component?- What is the probability of a component lasting between 40 and 50 days?
An experimental surgical procedure is being studied as an alternative to the old method. Both methods are considered safe. Five surgeons perform the operation on two patients matched by age, sex, and other relevant factors
financial managers inc buy and sells a large number of stocks routinely for various accounts that it manages. portfolio
What is the probability that 6 or more claims are made by males under 25? (C) What is the expected number of claims made by males under 25? What is the standard deviation of the distribution?
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