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A special diet is intended to reduce the cholesterol of patients at risk of heart disease. If the diet is effective, the target is to have the average cholesterol of this group be below 200. After six months on the diet, an SRS of 50 patients at risk for heart disease had an average cholesterol (of sample)= 192, with standard deviation s=21. Assume the distribution of the cholesterol for patients in this group is approximately Normal with mean (µ).
A 95% confidence interval for the average cholesterol level of all similar patients who have been on the diet for 6 months is
Calculate the p-value for the one sample t test. Make a conclusion based on the p-value given a significance level ?=0.02.
1write your response to the following question.we often hear you can lie with statistics. this is one way of saying
A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a person in Africa is selected at random
let x be binaomial with parameters n 15 and p .2a find the expression for the density for xb find the expression for
Determine the following areas under standard Normal distribution curve.
a.nbspthe random variable x is the number of siblings of a student selected at random from professor appiahs
If the mean number of serious accidents per year in a large factory (where the number of employees remains constant) is five, find the probability that in the current year there will be:
weights were measured for 5 female and 5 male beetle pupae. test the hypothesis of no difference in mean weight of
Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
For a binomial probability experiment, with n=150 and p=.2, it is appropriate to use the normal approximation to the binomial distribution.
Could the interval be used to estimate the mean amount of time a 9-year-old American spends eating & drinking each day. Explain.
a 0.1m3 rigid tank is initially filled with air at 400 kpa and 300k. then a valve is opened and the air flows out
Find a 95% confidence interval for the population mean concentration of uric acid in this patients blood. What is the margin of error?
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