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The length of the super bowl commercials is said to be Normally distributed with a mean of 36 seconds and a standard deviation of 8 seconds.
Bw commercials always seem to fall into the longest 4% of the Super bowl commercials. That means that Bw commercials are at least how long?
salvage value and goodwill cost can be important components of an inventory problem. how do they fit into the process
Survey of 8000 women, 5431 say they change their nail polish once a week. construct a 95% confidence interval for the population proportion of women who change their nail polish once a week.
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
smith is a weld inspector at a shipyard. he knows from keeping track of good and substandard welds that for the
Show the centers of positive and negative charge in (i) CCl4, (ii) C2H2Cl2, and (iii) CH3Cl. Which of these molecules can have two forms?
suppose that you add 10 to all of the observations in a sample. how does this change the sample mean? how does it
assume the distribution of heights among all 15 year old boys is normally distributed with mean 67 and standard
If statistically significant, do you think the difference is large enough to be important?
web crawlers need to estimate the frequency of changes to web sites to maintain a current index for web searches.
An airline claims that the no-show rate for passengers is less than 5%. In a sample of 420 randomly selected reservations, 19 were no-shows. Use the z-test for proportions and test the airline's claim. Use a = 0.01. Solution:
a horse race has 12 entries. assuming that there are no ties what is the probability that the three horses owned by one
A sample of 900 computer chips revealed that 76% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature states that 78% of the chips do not fail in the first 1000 hours of their use.
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