Dan earns £8.50 per hour. how much will he learn for 8 hours work?
2 answers:
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Using the z-distribution, the 99% confidence interval for the true population mean textbook weight is (72.37, 81.63).
<h3>What is a z-distribution confidence interval?</h3>The confidence interval is:
In which:
is the sample mean.
- z is the critical value.
- n is the sample size.
is the standard deviation for the population.
In this problem, we have a 99% confidence level, hence, z is the value of Z that has a p-value of
, so the critical value is z = 2.575.
The other parameters are given as follows:
Hence the lower and upper bound of the interval are given, respectively, by:
More can be learned about the z-distribution at brainly.com/question/25890103
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