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Among 100 vacuum tubes tested, 41 had lifetimes of less than 30 hours, 31 had lifetimes between 30 and 60 hours, 13 had lifetimes between 60 and 90 hours, and 15 had lifetimes of greater than 90 hours.
Are these data consistent with the hypothesis that a vacuum tube's lifetime is exponentially distributed with a mean of 50 hours?
Each student in an experiment was told to look at 100 cars and count the number of people wearing the seat belts. The mean score for the class was found to be 44, and standard deviation =7
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
using two independent samples we test for a hypothesized difference between two population means. the population
How could we rescreen for defective units from a population of 900 units and establish a 95% confidence that the whole 900 units are acceptable.? How many would we need to check out of the 900?
What role of operations that applies when you are solving an equation does not apply when you are solving an inequality? What is the inherent meaning and justification of cross-multiplication as it applies to solving an inequality?
in 1998 20 of university undergraduate students had at least one tattoo. a health practitioner obtains a random sample
question how does horsepower and weight affect the mileage of family sedans?nbsp data from a sample of twenty 2010
Do sit down restuarant franchises and fast food franchises differ significantly in stock price? Specifically, is the average stock price for sit-down restaurants different from the average stock price for fast food restaurants?
The statistical research was done primarily through the internet from governmental regulated sources. Estimates were used in consideration of absence of actual information.
Explain how the marketing analyst can use independent samples to collect the data.
A chemical process converts lead to gold. However, the production varies due to the powers of the alchemist. It is known that the process is normally distributed, with a standard deviation of 2.5 g. How many samples must be taken to be 90% certain..
Find the probability that a random sample of 50 customers will take between 90 and 112.5 minutes to complete all their transactions. That is, find the probability that will be between 1.8 and 2.25 minutes.
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