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The FDA is comparing the mean caffeine contents of two brands of cola. Independent random samples of 6-oz. soda cans of each brand were selected and the caffeine content of each soda can was determined. The study provided the following summary information.
using the approximations for normal curves what percentage of scores fall between the mean and one standard deviation
the compressive strength of concrete is being tested by a civil engineer. he tests 12 specimens and obtains the
suppose that on average a baseball player gets a hit once every three times she bats. what is the probability that she
Describe the assumptions of normality and homogeneity of variance. When these assumptions are violated, what are your options?
if the z-value for a given value x of the random variable x is z 1.96 and the distribution of x is normally
Who are also athletes but who are not regularly hit in the heads. Is this an example of an experimental or a non-experimental study? Why?
assume the distribution of heights among all 15 year old boys is normally distributed with mean 67 and standard
etting the significance level at a very high cutoff (such as 15%) increases chances of what type of error? Why do Type II errors concern scientists? Why have confidence levels of significance been set at 5% and 1%?
Express the original claim in symbolic form.
If we test to see if this is evidence at the 1% significance level that the cost of attendance has increased what is the p-value?
The time to complete a construction project is onrmally dsitributed with a mean of 60 weeks and a standar deviation of 4 weeks. What is the probability the project will be finished in 62 weeks or less?
The mean top of knee height of a sitting mate is 20.7 in.
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