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A firm producing light bulbs wants to know if it can clam that its light bulbs last 1000 hours to answer this question the firm takes a random sample of 100 bulbs and finds the average life time for this sample is 970 hour and the standard deviation is 80 hours. Can the firm clam that the average life time is 1000 hours at the 5% level of significance?
Medicare spending per patient in different U.S. metropolitan areas may differ. Based on the sample data below, is the average spending in the northern region significantly less than the average spending in the southern region at the 1 percent leve..
Find out the p-value associated with test of hypothesis you conducted?
We can think of this as the value of mew that maximizes f(y), the probability that our observed value of y occurs.
Describe the difference in the determination of a confidence interval of a normal distribution if the variance is known or unknown.
The principal randomly selected six students to take an aptitude test. Their scores were: 76.5 85.2 77.9 83.6 71.9 88.6. Determine a 90% confidence interval for the mean score for all students.
Predictors YearHire (year when the individual was hired), Race (1 if individual is black, 0 otherwise), and Rank (1 if individual is an assistant professor, 0 otherwise). Interpret these results.
A jar contains marbles of different colors: 4 white, 6 black, 6 red, and 4 blue. On two random drawings, without replacement, find the probability that the first is black and the second is white.
Estimate the number of workers in the sample who are union members by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response.
A currency trader observes that in the spot exchange market, 1 U.S. dollar can be exchanged for 9 Mexican pesos or for 111.23 Japanese yen. What is the cross-exchange rate between the yen and the peso
If there is one-year warranty on the equipment, what proportion of the customers will actually make a valid warranty claim?
How do you determine the common factor in an expression? Please give some concrete examples. what is a common factor ? Where do you use the common factor in an expression consisting of various terms?
On the basis of the sample results, can we conclude that the mean annual lease rate is higher in Hong Kong than in Paris? Develop appropriate null and alternative hypotheses.
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