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The American Lighting Company developed a new light bulb that it believes will last at least 700 hours on average. A test is to be conducted using a random sample of 100 bulbs, and a 5% level of significance. Assume that the population standard deviation is 15 hours. What are the consequences of making a type II error? What is the probability of making a Type II error if the true population mean is 695 hours?
Mention your decision regarding the null hypothesis. If H 0 rejected can we conclude that treatment 2 and treatment 3 differ? Use 95 percent level of confidence.
Determine standard deviation be if sample contained 100 students rather than 50? How large the sample is required to decrease standard deviation of percentage who say "Yes" from 7% to 3.5%?
The manager of a department store wants to determine what proportion of people who enter the store use the store's credit cards for their purchases.
Find a linear function G(p) that gives the number of gallons sold as a function of the price of the milk.
a simple random sample of 29 students enrolled in graduate programs was selected and the age of each student when they
an engineer is going to redesign an ejection seat for an airplane. the seat was designed by pilots weighing between 150
a random variable y has unknown mean micro and standard deviation 20. what is the sample size n needed so that the 99
Doctors nationally believe that 68% of a certain type of operation are successful. In a particular hospital 47 of these operations were observed and 37 of them were successful. At a = 0.05 is this hospital's success rate different from the nationa..
Critique the HR manager's planned approach and give him advice on how to proceed. You can assume that a reasonable estimate for the proportion of new hires that are happy with the company is .8.
For the sample of 32 lg us cities the correlation between the mean # of sq ft per office worker and the mean monthly rental rate in the central business district is the -.363 at the .05 significance level
scores on an endurance test for cardiac patients are normally distributed with mean 200 and standard deviation 30.a
Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
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