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I think I know the answer but want to confirm..thanks. Can it be established at =.05 that a majority of students favor the plus/minus grading system at a university if in a random sample of 500 students, 270 favor the system? Show your work, all computations including hypothesis and test...

Think I know the answer but need confirmation. Does the sample evidence indicate that the average time an employee stays with a company in their current positions is less than 3 years? A random sample of 50 employees yielded a mean of 2.79 years and s=.76. Use ?=.01. Show your work, all...

Think I know the answer but I need to make sure :) Thanks. The internal auditing staff of a local manufacturing company performs a sample audit each quarter to estimate the proportion of accounts that are delinquent (more than 90 days overdue). For this quarter, the auditing staff randomly...

I think I know the answer but I'm looking for confirmation- A Research and Development Laboratory researcher for a paint company is measuring the level a certain chemical contained in a certain type of paint. If the paint contains too much of this chemical, the quality of the paint will be...