Mathematics, 28.04.2021 07:00 sanchezp0821

Heather runs a successful lawn-mowing business. She would like to estimate the true mean amount of time it takes for her employees to mow a lawn. To do so, she selects a random sample of 30 customers and records the time it
takes the employees to mow their lawns. The 90% confidence interval for the true mean time it takes for her
employees to mow a lawn is 40-55 minutes. Which of the following would decrease the width of the interval?
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