abbeymorris3184
10.11.2019 •
Mathematics
Suppose a 95% confidence interval for μ turns out to be (1,000, 2,100). to make more useful inferences from the data, it is desired to reduce the width of the confidence interval. which of the following will result in a reduced interval width? a) increase the sample size. b) increase the confidence level. c) increase the population mean. d) increase the sample mean.
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Ответ:
a) Increase the sample size
Step-by-step explanation:
Given that a 95% confidence interval for μ turns out to be (1,000, 2,100)
The confidence interval is formed as
Margin of error = critical value * std dev/sqrt of sample size
Hence for the same confidence level, we cannot change critical value.
The only available ways are either to decrease std deviation or increase the sample size to make it narrower.
If confidence level becomes higher, then confidence interval would be wider.
Here out of four options the correct option is
a) Increase the sample size
Ответ:
The answer is just 20