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Suppose we know the standard deviation of a certain population is 8. A sample size of 64 has a mean of 85.
a) Determine the 95% confidence interval estimate of the population mean.
b) Repeat part (a) with a sample size of 100.
c) Repeat part (a) with a confidence interval of 99%.
d) Describe what happens to the confidence interval estimate when:
- the sample size increases.
- Confidence level increases
If the mean μ does not differ significantly from 5.5 (that is, if the null hypothesis is true), then the probability of obtaining a sample mean y as far or farther from 5.5 than 5.4 is .1034.
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Please, would you help me to understand the Confidence Interval with this exercise please
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