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A medical investigation claims that the average number of contaminations per week at a Main Hospital is 100.4. A random sample of 10 weeks had a mean number of 99.98. The sample standard deviation is 2.9. Is there enough evidence to reject the investigator's claim at alpha =.05?
Dishwashers. Dan's Diner employs three dishwashers. Al washes 40% of the dishes and breaks only 1% of those he handles.
The store manager observes the complaints office for a 30-minute period, during which no complaints are received.
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.
a new grug had a potency advertised at 75. given the following smaple datan25x bar 76.6s1a check manufacturers claim
Estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 1.5 percentage points.
In an experiment, rats were fed a stock ration for 100 days with various amounts of gossypol added. The following weight gains in grams were recorded.
Set a value for the level of significance to be used in the test? After answering this question, what type of error would you suppose may result in that case?
New product ideas are a staple of our culture. Just take a look around you-how many billboards or television commercials can you count advertising new products.
a california university is investigating expanding its evening programs. it wants to target people between 25 and 55
weakly earnings on a certain import venture are approximately normally distributed with a known mean of 219 and unknown
the probability that an individual has 20-20 vision is 0.15. in a class of 50 students what is the mean and standard
We can assign probabilities to values of using the normal density curve with mean 0.30 and standard deviation 0.023. Use this density curve to find the probabilities of the following events.
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