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Two pain relief drugs are being considered. A random sample of doses of the first drug showed that the average amount of time required before the drug was absorbed into the bloodstream was x1 = minutes with a standard deviation s1 = minutes. For the second drug, a random sample of doses shoes the average time required for absorption was x2 = minutes with a standard deviation of s2 = minutes. Assume the absorption times follow a normal distribution. Find a % confidence interval for the difference in average absorption time for the two drugs. Does it appear that one drug is absorbed faster than the other at the % significance level.
Given the data set body-weight.sav, use SPSS to calculate the 90%, 95% and 99% confidence intervals for the mean of the variable weight.
An orange juice producer buys all their oranges from one particular orchard. The amount of juice from the oranges is approximately normally distributed with a mean of 152 ml. and a standard deviation of 41 ml.
Cables is selected and tested find the sample mean that will cut off the upper 95% of all the sample of 20 taken from the population. Assume the variable is normally distributed.
In 2004, Newsmonth reported that 60% of young children have blood lead levels that could impair their neurological development. Assuming that a class in a school is a random sample from the population of all children at risk
In a sample of 60 mice, a biologist found that 46% were able to run a maze in 30 seconds or less. Find the 99% limit for the population proportion of mice who can run that maze in 30 seconds or less?
Compute a 95% confidence interval for the mean saline of the tears. You select a random sample of 100 tear drops. The sample has an average salt concentration of 0.1 with a standard deviation of 0.01.
The following table shows the hardness (in Brinell hardness numbers) and the tensile strength (in thousands of pounds per square inch) of ten specimens of a certain alloy.
Explain the difference between a left-tailed, two-tailed, and right-tailed test. When would we choose a two-tailed test? How can we tell the direction of the test by looking at a pair of hypothesis?
The population of car speeds is approximately normally distributed. Determine a 90% confidence interval estimate for the speed of all cars.
Which of the following Venn diagrams has shaded the event that the contractor wins exactly one of the contracts and evaluate the mean time to complete the entire homework assignment
In a slow year, Deutsche Burgers will produce 2 million hamburgers at a total cost of $3.5 million. In a good year, it can produce 4 million hamburgers at a total cost of 4.5 million.
When determining the sample size necessary for estimating the true population mean, which factor is not considered when sampling with replacement
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