I did my best to explain it on graph paper. I hope this helps! Look at the attached picture.
26 30 45 43 26 14 28 33 56 29 What is the mean of the data set?
2 answers:
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Answer:
Step-by-step explanation:
Given that in order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is less than two hours in estimating the average time it takes to install tile flooring.
Std deviation =4.5 errors
95% confidence interval = Mean±1.96*std dev
Hence we have
Sample size should be 20.