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the manufacturer of a certain brand of light bulb claim that the variance of the lives of these bulb is 4200 square hours.a consumer agency took a random sample of 25 such bulb and tested them. the variance of he lives of these bulb was found to be 5200 square hours. Assume that the lives of all such bulb (approximately) normally distribution.
a) make the 99% confidence intervals for the variance and standard deviation of the lives of all such bulbs.
b) test at the 5% significant level whether the variance of such bulbs is different from 4200 square hours.
Create a 95% confidence interval for proportion of highly educated women who left careers for family reasons and who wish to return to work.
Provide an explanation of a chi-square test. Why would you use the chi-square statistic? What type of data is used with chi square analysis?
Categorize the events as dependent or independent. Events A and B where P (A) = 0.7, P (B) = 0.8, and P (A and B) = 0.56.
There are two types of dependent samples: Those that measure something before and after an "event" and those that matching two samples of the same phenomena being observed. Which of the following is NOT true about such a test:
Identify the independent and dependent variables. Indicate the number of levels in the independent variable and describe each level.
What are the possible combinations of coins that Sanjay could have received in change?
A state executive claims that the average number of acres in western Pennsylvania State Park is less than 2000 acres. A random sample of five parks is selected, and the number of acres is shown. At alpha=.01, is there enough evidence to support th..
Which component of a time series is most likely to occur? Which component has a pattern that must be complete in a single year and repeat from year to year?
ABC Corp. is a firm with all-equity financing. Its equity beta is .80. The Treasury bill rate is 4 per cent and, and the market risk premium is expected to be 10 per cent. What is ABC's asset(equity) beta?
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval estimate for the variance of life expectancy in Europe?
A large discount chain compares the performance of its credit managers in Ohio and Illinois by comparing the mean dollar amounts owed by customers with delinquent charge accounts in these two states.
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