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An industrial arts instructor has deisgned a test of mechancical aptitude (MechA) and having investigated its properties, finds that studnets with scores lower than 8 tend to do poorly in the class. Those with scores higher than 12 excell. Admininistering it to a random sample of industrial arts students reveals the following scores: 7, 5 9, 13, 12, 10, 14, 10, 11, 10.
a) What percentage of the distribution will fall in the area of the distribution expected to do poorly?
b) What percentage of teh distribution will fall in the area of the distribution expected to excell?
c) A score of 12 occurs at what percentile?
A manufacturer claims that the mean lifetime, mean, of its light bulbs is 52 months. The standard deviation of these lifetimes is 7 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 55 months.
A particular medical operation proves fatal in 1% of the cases. Find an approximation to the probability that there will be at least 2 fatalities in 200 operations.
A survey of 600 non-fatal accidents showed that 111 involved the use of a cell phone. Find a point estimate for p, the population proportion of accidents that involved the use of a cell phone.
A coin was flipped 60 times and came up heads 38 times (a) at the time .10 level of significance is the coin based towards heads? show your decision rule and calculations (b) calculate a p value and interpet.
Assume that an old used car fails to start 10% of the time. The other 90% of the time it drives for a time period which is uniformly distributed in the interval 20 to 30 minutes. In this interval all subintervals of time of equal width between 20 ..
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a random sample of 64 students at a university showed an average age of 25 years and a sample standard deviation of 2
you are applying for graduate school at university a. in the past 42 of the applicants to this university have been
Best Electronics, Inc. offers a "no hassle" returns policy. The number of items returned per day follows the normal distribution. The mean number of customer returns is 10.4 per day and the standard deviation is 2.3 per day.
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
statistics is about more than calculations. it is about turning data into information and using this information to
City officials in Fort Lauderdale, Florida, are trying to decide whether to evacuate coastal residents in anticipation of a major hurricane that my make landfall near their city
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