Exam 1: Defining and Collecting Data

Which of the following scenarios will yield a nonprobability sample?

SCENARIO 1-2 A Wall Street Journal poll asked 2,150 adults in the U.S.a series of questions to find out their view on the U.S.economy. -Referring to Scenario 1-2, the possible responses to the question "On the scale of 1 to 100 with 1 being extremely anxious and 100 being total not anxious, rate your level of anxiety in this U.S.economy" are values from a

A telemarketer set the company's computerized dialing system to contact every 25th person listed in the local telephone directory.What sampling method was used?

SCENARIO 1-1 The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a Blu-ray player made by the company over the past 12 months are satisfied with their products. -Referring to Scenario 1-1, the possible responses to the question "What is your annual income rounded to the nearest thousands?" are values from a

The professor of a business statistics class wanted to find out the mean amount of time per week her students spent studying for the class.Among the 50 students in her class,20% were freshmen, 50% were sophomores and 30% were juniors.She decided to select 2 students randomly from the freshmen, 5 randomly from the sophomores and 3 randomly from the juniors.This is an example of a systematic sample.

The oranges grown in corporate farms in an agricultural state were damaged by some unknown fungi a few years ago.Suppose the manager of a large farm wanted to study the impact of the fungi on the orange crops daily over a 6-week period.On each day a random sample of orange trees was selected from within a random sample of acres.The daily average number of damaged oranges per tree and the proportion of trees having damaged oranges were calculated.The two main measures calculated each day (i.e., average number of damaged oranges per tree and proportion of trees having damaged oranges) may be used daily to estimate the respective true population _.

Marital status is an example of an ordinal scaled variable.

A sample of 300 subscribers to a magazine is selected from a population frame of 9,000 subscribers.If, upon examining the data, it is determined that no subscriber had been selected in the sample more than once,

Which of the following is most likely a population as opposed to a sample?

Which of the following is a continuous quantitative (numerical) variable?

In business statistics class students sit randomly without preferences.A sample is selected by including everybody who sits in the first row.This is an example of a cluster sample.

An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance.A person's age is an example of a numerical variable.

A personal computer user survey was conducted.Hours of personal computer use per week is an example of a numerical variable

SCENARIO 1-3 The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a Blu-ray player made by the company over the past 12 months are satisfied with their products. -Referring to Scenario 1-3, if a customer survey questionnaire is included in all the Blu-ray players made and sold by the company over the past 12 months, this method of collecting data will most like suffer from

The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a Blu-ray player made by the company over the past 12 months are satisfied with their products.Which of the following will be a good frame for drawing a sample?

The only way one can eliminate sampling error is to take the whole population as the sample.

SCENARIO 1-2 A Wall Street Journal poll asked 2,150 adults in the U.S.a series of questions to find out their view on the U.S.economy. -Referring to Scenario 1-2, the possible responses to the question "How would you rate the condition of the U.S.economy with 1 = excellent, 2 = good, 3 = decent, 4 = poor, 5 = terrible?" are values from a

Researchers are concerned that the weight of the average American school child is increasing implying, among other things, that children's clothing should be manufactured and marketed in larger sizes.If X is the weight of school children sampled in a nationwide study without rounding, then X is an example of

The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000) workers in order to study their preferences for the various components of a potential package.The Director will use the data from the sample to compute .

The professor of a business statistics class wanted to find out the mean amount of time per week her students spent studying for the class.She divided the students into the left, right and center groups according to the location they sat in the class that day.One of these 3 groups was randomly selected and everyone in the group was asked the mean amount of time per week he/she spent studying for the class.This is an example of a cluster sample.