he population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we want to be 95% confident that the sample mean is within 2 inches of the true population mean, what is the minimum sample size that can be taken? z0.101.282z0.051.645z0.0251.960z0.012.326z0.0052.576 Use the table above for the z-score, and be sure to round up to the nearest integer.
The population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we want to be 95% confident that the sample
z0.101.282z0.051.645z0.0251.960z0.012.326z0.0052.576
Use the table above for the z-score, and be sure to round up to the nearest integer.
Given :
The population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. There is 95% confident that the sample mean is within 2 inches of the true population mean .
Standard deviation : , Margin of error : E = 2 inches
At 95% confidence level :
refers to the likelihood that the true population parameter lies outside the confidence interval . It is usually expressed as a proportion. Thus, if the confidence level is 95%, then alpha would equal 1 - 0.95 or 0.05.
= 0.05
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