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A random survey of 30 countries across the world yielded an average life expectancy of 62 years with a standard deviation of 6 years. Construct a 98% confidence interval for the average life expectancy of countries around the world. The data appear to be normally distributed.
Suppose the salary of assembly line workers has Normal distribution with mean of $20,000, and standard deviation of $3,000.
The calculated Z test statistic is a positive value that leads to a p-value of .045 for the test. If the significance level (α) is .01, the null hypothesis would be rejected.
Are you doubtful of any of these data points? if so why does there show to be a linear relation between degree of stenosis and nuber of reactive nuclei?
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
Assuming a normal distribution, What is the z-score associated with the second quartile? If we wish to have 95% confidence interval, what would be the value of the confidence coefficient?
These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same order in which they were drawn. What is the probability of winning?
What is the rejection point at α = .01 and indicate if you would accept or reject H o ?
In the context of hypothesis testing regarding one mean, the test (Z or t) may be statistically significant at the 5% level, but not significant in a practical sense at all. Illustrate the meaning of this statement by citing 3 examples from any ar..
A company uses triple time estimates to determine expected completion time for all of their projects. If they determined the expected time to complete a project is 25 weeks with a variance of of 9 weeks
A local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital. What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confiden..
You are given the choice of three doors. Behind one is a new car and the others hide a barnyard animal for you to keep. After you choose door number one, your host (Monty) opens door three to reveal a goat.
If the computer manufacturer decides to sample 2,300 of the microchips received in each shipment, what acceptance number, c, would they want?
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