Exam 10: Statistical Thinking And Applications

A manager at a local manufacturing company has been monitoring the output of one of the machines used to manufacture small aluminum plates.Past data indicate that if the machine is operating "properly," the length of the plates produced by this machine can be modeled as being normally distributed with a mean of 117 centimeters and a standard deviation of 5.2 centimeters.Suppose 10 plates produced by this machine are randomly selected.What is the probability that the average length of these 10 plates will be between 116 and 120 centimeters when the machine is operating "properly?"

At the individual or personal level,statistical thinking can help employees in all of the following EXCEPT:

_____ is a methodology for drawing conclusions about equality of means of multiple populations.

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,what is the predicted number of monthly labor hours required for a hotel with 3000 bed-day of occupancy for the month?

Errors in sampling generally stem from two causes: _____ error and _____ error.

Collecting,organizing,summarizing,and presenting data is referred to as statistical inference.

Explain the major lesson to be learned from Deming's Funnel Experiment.

All of the following are illustrated by the Red Bead Experiment EXCEPT:

Statistical thinking is a philosophy of learning and action based on all of the following principles EXCEPT:

According to Deming,the study of a dynamic time series is called:

Three scatter diagrams are given below.How many of the diagrams present data that can be described by a linear relationship and,therefore,justifiably summarized by the correlation coefficient? Plot A Plot B Plot C

_____ involves drawing inferences about two contrasting propositions relating to the value of a population parameter,one of which is assumed to be true in the absence of contradictory data.

A particular type of plastic soap bottle is designed to have a capacity of 15 ounces.There is variation in the bottle manufacturing process.Based on historical data,suppose that bottle capacity can be reasonably modeled by a normal distribution with a mean of 15 ounces and a standard deviation of 0.2 ounces.What proportion of these bottles will have a capacity between 14.7 and 15.1 ounces?

One of the biggest mistakes that people make in using statistical methods is confusing data that are sampled from a _____ with data sampled from a _____.

Partitioning a population into hierarchical groups or levels,and selecting a sample from each group or level is known as:

Special-cause variation tends to be easily detectable using statistical methods.

An airline that computes the average number of baggage handling errors that has occurred per 1,000 passengers in the last year is utilizing statistical inference.

_____ can often be tested by holding one variable constant while changing the other to determine effects of the change.

A _____ sample is one obtained by separating the population into non-overlapping groups,and then selecting a simple random sample from each group.

Sample statistics are often used as point estimators for population parameters.