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The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses fewer than 600 minutes?
You want to determine if the sample result gives good evidence that the true amount of the compound is not equal to 2 gms. Carry out the test, find the P-value, and state your conclusion.
What control limits should be applied to his sample?
The number of shark attacks per year in the US is distributed approximately normal, with a Variance of 31.8 and a standard deviation of 10.
A rental agent claims that the mean monthly rent, , for apartments on the east side of town is less than $675 . A random sample of 18 monthly rents for apartments on the east side has a mean of $661, with a standard deviation of $24.
In checking the quality of the work, she notices that some slight blemishes occasionally are apparent. A sample of 20 pieces of work resulted in the following number of blemishes on each piece:
Given a level of confidence of 99% and a population standard deviation of 10, what other information is necessary:
A study was conducted to determine whether magnets were effective in treating pain. The valves represent pain measurements.
What is the answer to the following unsorted data shows the number of traffic tickets given each day by Deputy Fife over the last eleven days.
Is there a significant difference in the average prices for these two different supermarket chains? Test at α = 0.05
A stationary store wants to estimate the mean retail value of greeting cards that it has in inventory A random sample of 100 greeting cards. a mean value of 2.55 and standard deviation of 0.44
What is the probability that the debt for a borrower with good credit is more than $18,000?
The following data represents the amount of time in minutes that a person had to wait for a bus to work on a random sample of 5 working days.
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