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The shelf life of a battery produced by one major company is known to be normally distributed, with a mean life of 3.5 years and a standard deviation of 0.75 years. What is the upper quartile of battery shelf life?
The U.S. Department of Transportation defines an airline flight as being "on-time" if it landed less than 15 minutes after the scheduled time shown in the carrier's Computerized Reservation System.
A random sample of doctors was taken suppose the test statistic is z= -1.95. can we conclude that h0 should be rejected at the 1) a=.10 b) a=0.05 c) a= 0.01 level?
in a certain country 9 of the population have a certain disease. a diagnostic blood test has been developed for the
a random sample of size 100 is drawn from a population with population proportion 0.70. find the probability that the
in one particular race there are 7 people 3 of which are runners of the track coach. the race is so competitive that
Choose and compute the appropriate descriptive statistics to describe characteristics of the sample under study (such as sex distribution, age, and ethnicity).
graduates from a graphic arts course at a community college have a mean starting salary of 32000 with a standard
the local bakery bakes more than a thousand 1-pound loaves of bread daily and the weights of these loaves vary. the
Using the original data, estimate the population standard deviation with 90% probability.
Of the estimated natural gas reserves in North America, 4.59 *10^9 m ^3 are in United States. 2.66*10^9 m^3 are in Canada, and 1.99*10^9 m^3 are in Mexico.
Mean of 61 minutes and a standard deviation of 9 minutes. Find the proportion of runners who take more than 70 minutes to finish. Draw a sketch to show this proportion.
How can you or your department decide whether or not the variation is important? How could using a mean difference test help?
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