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The number of O-ring failures for the first 23 flights of the US space shuttle Challenger were
0 1 0 NA 0 0 0 0 0 1 1 1 0 0 3 0 0 0 0 0 2 0 1
(NA means not available { the equipment was lost). Make a table of the possible categories. Try to find the
mean. (You might need to try mean(x,na.rm=TRUE) to avoid the value NA, or look at x[!is.na(x)].)
A local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital. a) Provide a 95% confidence level for all the patients who are referred to the health center by the hospital.
Classic Golf, Inc. manages five courses in the Jacksonville, Florida, area. The Director wishes to study the number of rounds of golf played per weekday at the five courses. He gathered the following sample information.
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
a sample of nine public universities and nine private universities was taken. the total cost for the year including
nicomachus defined a fifth proportion to exist whenever among three terms the middle term is to the lesser as their
The winning team's scores in 9 high school basketball games were recorded. If the sample mean is 9.8 points and the sample standard deviation is 0.15 points, find the 98% confidence interval of the true mean.
Electricity is commonly traded at the California-Oregon border (COB) and Palo Verde (PV) in Arizona. Assume you take a sample of 100 daily electricity market closing prices (in $/megawatthour) from both COB and PV.
A loaf of bread is normally distributed with a mean of 22 oz and a standard deviation of 0.5 oz. What is the probability that a loaf is more than 22.25 oz?
What is the 99% confidence interval?
When the non-parametric statistics utilized? Write down an example.
question the bank customer waiting time caserecall that a bank manager has developed a new system to reduce the time
You only worry if there is at least a 50 or more percent chance that you have the disease. Suppose that test has same specificity = p For what value of p will you start to worry?
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