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A manufacturer claims that the mean lifetime, μ, of its light bulbs is 49 months. The standard deviation of these lifetimes is 6 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 47 months. Can we conclude, at the 0.01 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 49 months? Perform a two-tailed test.
A nationwide real estate company claims that its average time to sell a home is 57 days. Suppose it is known that the standard deviation of selling times is 12.3 days and that selling times are normally distributed.
Draw a scatter diagram and consider the correlation for the provided data. Do larger universities tend to have more property crime.
Make a point estimate and a 95% confidence interval estimate.
A Statistic professsor plans classes so carefully that the lenths of her classes are uniformly distributed between 46.0 and 56.0 minutes. Find the probability that a given class runs less than 51.5 minutes. Find the probability of selecting a clas..
Basing your decision on the value of the t statistic, is it reasonable to say that this information supports the hypothesis that the mean of the population is 58?
If circuit switching is utilized, how many user can this access link support?
What does a squared correlation coefficient represent? Also, does the strength of the correlation depend on the direction? Finally, does correlation imply causation.
Can you please derive the mean and variance of a RV X, which has a Poisson distribution.
Show the graph of the probability density function for flight times. What is the probability that the flight will be no more than 5 minutes late?
Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean number of available hotel rooms, based on the point estimate of each sampl..
Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results any group over 30 needs z test.
If the safety commission determines that an elevator design is safe if its operating load is exceeded less than 0.05% of the time, does this prototype meet these saftey guidelines?
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