Many homeowners rely on handymen to perform small jobs, such as repairs or maintenance, around their residence.
Question:
Many homeowners rely on handymen to perform small jobs, such as repairs or maintenance, around their residence.
According to HomeAdvisor Inc., the average cost for a handyman project is $460. Assume the population standard deviation is $95. A random sample of 30 handyman projects was selected.
a. What is the probability that the sample mean will be less than $475?
b. What is the probability that the sample mean will be between $450 and $465?
c. Identify the symmetrical interval that includes 95% of the sample means if the true population mean is $460 per project.
d. Suppose the sample mean was $411. Does this result support the findings of HomeAdvisor Inc.?AppendixLO1
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Jonas Araujo
I have recently received the degree of PhD. In Physics by the Universidade Federal do Maranhão after spending a term in Durham University, as I have been awarded a scholarship from a Brazilian mobility program. During my PhD. I have performed research mainly in Theoretical Physics and published works in distinguished Journals (check my ORCID: https://orcid.org/0000-0002-4324-1184).
During my BSc. I have been awarded a scholarship to study for a year in the University of Evansville, where I have worked in detection-analysis of photon correlations in the the Photonics Laboratory. There I was a tutor in Electromagnetism, Classical Mechanics and Calculus for most of that year (2012).
I am very dedicated, honest and a fast learner, but most of all, I value a job well done.
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