A website advertises job openings on its website,but job seekers have to pay to access the list of job openings.The website recently completed a survey to estimate the number of days it takes to find a new job using their service.It took the last 30 customers an average of 60 days to find a job.Assume the population standard deviation is 10 days.Calculate a 95% confidence interval of the population mean number of days it takes to find a job.
A)[40.4000,79.6000]
B)[55.9085,64.0915]
C)[56.4215,63.5785]
D)[56.9966,63.0034]

Question

Quizplus · Accepted Answer

The 95% confidence interval is calculated using the formula: mean ± (Z * (σ/√n)), where Z is the Z-score for 95% confidence (1.96), σ is the population standard deviation (10), and n is the sample size (30). This results in the interval [56.4215, 63.5785].

A Website Advertises Job Openings on Its Website,but Job Seekers