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The repair time for air conditioning units is believed to have a normal distribution with a mean of 39 minutes and a standard deviation of 11 minutes. What is the probability that the repair time for an air conditioning unit will take less than 30 minutes?
Use the information above to calculate the Z score. Round your answer to the second decimal place:
Use the calculated Z score along with the Z table to find the probability that the repair time for an air conditioning unit will be less than 30 minutes. Write your answer to the 4th decimal place:
Use the probability value that you just found and decide whether or not it would be unusual to have a repair time that is less than 30 minutes. Explain reasoning behind answer
In a string of 100 Christmas lights, there is a .011 chance that a given bulb will fail within the first year of use (if one bulb fails, it does not affect the others)
a simple random sample of size n 125 is obtained from a population whose size is n 10000 and whose population
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
A hypothesis will test that two population means are equal. A sample of 10 with a standard deviation of 3 is selected from the first population and a sample of 15 with a standard deviation of 8 from the second population.
Using a significance level of 0.03, carry out a hypothesis test to determine if there is convincing evidence to support the claim that fewer than half of adult Americans can name at least one justice currently serving on the Supreme Court.
Find the probability that the injured person is female. P( P( )=? E. Find the probability that the injured person is female and was hurt at work. P( P( )=? F.
Flu cases this past fly season in the Central City school system were about 15 per week. For the entire state, the weekly average is 16 and the standard deviation, 2.35. Are the kids in Central City as sick as the kids throughout the state?
what is the sample space of all possible outcomes? Are the outcomes equally likely?
Mean output of solar cells of three types are measured six times under random light intensity over a period of 5 minutes, yielding the results shown. Research Question: Is the mean solar cell output the same for all cell types?
If a total of 5,450 packages are shipped for .$1,926, determine how many individual packages were shipped and how many groups of 15 were shipped.
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
Small Wonder, an amusement park, experiences seasoned attendance. It has collected two years of quarterly attendance data and made a forecast of annual attendance for the upcoming year.
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