Exam 10: Statistical Thinking And Applications

Exhibit 10-1 In an audit of the outstanding bills in a large multi-national firm, the auditor selected a random sample of 40 of these bills and recorded the dollar value of each outstanding bill.The data were analyzed using Excel (see below). -Refer to Exhibit 10-1.A 99% confidence interval for the population mean dollar value of the outstanding bills is equal to _____.

Exhibit 10-2 A manager of a hotel chain is interested in investigating whether there is a relationship between staff labor hours and bed-day occupancy incurred by a hotel in a month.The manager randomly selected 17 of the hotels in the chain across the country and recorded, for each of the hotels, the staff's total labor hours for the month of July and the number of bed-days of occupancy for that month. (A hotel has occupied one "bed-day" if one bed is occupied (rented)for an entire day.)The manager is interested in seeing if the labor hours incurred can be predicted from the number of bed-days of occupancy on a monthly basis. The sample data were analyzed using Excel.Shown below is part of the regression analysis output. -Refer to Exhibit 10-2.According to this regression analysis,if the number of bed-days increases by 200,what is the predicted change in the number of labor hours required for a given month?

In simple regression,a function describes how the dependent variable is a function of the independent variable.

Characteristics of the population are called:

Which of the following constitutes an approach to reducing sampling error?

Explain the three fundamental principles of statistical thinking.Use an example from either your personal life or a work process to illustrate.

In Deming's view,variation is the root cause of poor quality.Explain the difference between common and special cause variation.Discuss Deming's recommendations to eliminate variation.

If random samples are not used,_____ may be introduced.

Exhibit 10-2 A manager of a hotel chain is interested in investigating whether there is a relationship between staff labor hours and bed-day occupancy incurred by a hotel in a month.The manager randomly selected 17 of the hotels in the chain across the country and recorded, for each of the hotels, the staff's total labor hours for the month of July and the number of bed-days of occupancy for that month. (A hotel has occupied one "bed-day" if one bed is occupied (rented)for an entire day.)The manager is interested in seeing if the labor hours incurred can be predicted from the number of bed-days of occupancy on a monthly basis. The sample data were analyzed using Excel.Shown below is part of the regression analysis output. -Refer to Exhibit 10-2.For the estimated regression equation y = a + bx,what is the value of b?

A subset of items selected from a population is called a:

In a designed experiment,a _____ measures the difference that a factor has on the response.

A sample from a large finished goods inventory is needed to determine the proportion of non-conforming products.Historically,about a 0.8 percent level of nonconformance has been observed.A 95 percent confidence level with an allowable error of 0.3 percent is desired.What is the required sample size?

The component of statistical methodology that includes the collection,organization,and summarization of data is called:

Which of the following is Rule 1 in Deming's Funnel Experiment?

The following sample data were collected: 12.0,18.3,29.6,14.3 and 27.8.The sample standard deviation for this data is equal to _____.

In a simple designed experiment,the different levels of each factor are commonly called _____.

A census is a representative sample of the population.