The Table Below Shows the Mean Number of Daily Errors

question 6

Multiple Choice

The table below shows the mean number of daily errors by seven air traffic controller trainees during the first two weeks on the job.We want to perform a paired t-test at  = .05 to see if the mean daily errors have decreased from Week 1 to Week 2. The right-tailed critical value at  = 0.05 is:

• A) 1.895
• B) 1.943
• C) 2.447
• D) 2.365

---

Definitions:

Percent of Sales Method

A financial forecasting model that predicts future variables, such as expenses and inventory levels, as a percentage of projected sales.

Credit Sales

Sales of goods or services that are paid for at a later date, extending credit to customers.

Bad Debt Expense

An expense reported by businesses to account for receivables that are no longer collectible, affecting the net income.

Allowance for Doubtful Accounts

A contra-asset account on the balance sheet, estimating the amount of receivables that are expected to be uncollectible.