Charactertisic of interest and a standard deviation
Suppose a population has a mean of 7 for some charactertisic of interest and a standard deviation of 9.6. A sample is drawn from this population of size 64. What is the standard error of the mean?
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At the end of year year self -employed person deposits $1500 in retirement account which earns 10% annually. How much will be in account when individual retires at age of 65 if contributions begin when person is 45 years old?
For most current year available, the mean annual cost to attend the private university in the United States was $20,157. Suppose the distribution of annual costs follows the normal probability distribution and standard deviation is $4,425.
A biologist reports the confidence interval of (4.1, 5.3) when determining the mean height(in centimeters) of a sample of seedlings. The estimated margin of error is? The sample mean is?
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Smith is the weld inspector at the shipyard. He knows from keeping track of good as well as substandard welds that for the afternoon shift 5% of all welds done will be substandard. Of smith checks 300 of the 7500 welds completed that shift, determ
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The upper 0.05 critical value of the standard Normal distribution is
What fraction survive fewer than 880 days? what length of warranty is required so that no more than 10% of batteries will be anticipated to fail during warranty period?
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