Question 1

The Commissioner of Health in New York State wanted to study malpractice litigation in New York.A sample of 31 thousand medical records was drawn from a population of 2.7 million patients who were discharged during 2010.The true proportion of malpractice claims filed from the population of 2.7 million patients is a .

Accepted Answer

The answer of The Commissioner of Health in New York...

Question 2

The British Airways Internet site provides a questionnaire instrument that can be answered electronically.Which of the 4 methods of data collection is involved when people complete the questionnaire?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

Surveying involves collecting data through questionnaires, interviews or focus groups. In this case, British Airways is collecting data through a questionnaire instrument on their website.

Question 3

Which of the 4 methods of data collection is involved when a person counts the number of cars passing designated locations on the Los Angeles freeway system?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

The method involved in this scenario is observation, as a person is physically counting the number of cars passing designated locations.

Question 4

The Quality Assurance Department of a large urban hospital is attempting to monitor and evaluate patient satisfaction with hospital services.Prior to discharge, a random sample of patients is asked to fill out a questionnaire to rate such services as medical care, nursing, therapy, laboratory, food, and cleaning.The Quality Assurance Department prepares weekly reports that are presented at the Board of Directors meetings and extraordinary/atypical ratings are easy to flag.True population characteristics estimated from the sample results each week are called.

Accepted Answer

The answer of The Quality Assurance Department of a large...

Question 5

Which of the following is NOT a reason for selecting a sample?
A)A sample is less time consuming than a census.
B)A sample is less costly to administer than a census.
C)A sample is usually not a good representation of the target population.
D)A sample is less cumbersome and more practical to administer.

Accepted Answer

The reason for selecting a sample is to obtain a smaller but representative group to study, which saves time, cost, and resources. However, if a sample is not a good representation of the target population, it defeats the purpose of selecting a sample. Therefore, option C is not a reason for selecting a sample.

Question 6

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?
A)Telephone directory.
B)Voting registry.
C)The list of customers who returned the registration card.
D)A list of potential customers purchased from a database marketing company.

Accepted Answer

The list of customers who returned the registration card will be the best frame for drawing a sample as it contains information specifically about customers who have purchased a Blu-ray player from the company. This frame will ensure that the sample represents the target population accurately. The other frames, such as a telephone directory or a list of potential customers purchased from a marketing database company, may not provide relevant information about customers who have purchased the specific product in question. The voting registry is also not relevant in this case.

Question 7

Jared was working on a project to look at global warming and accessed an Internet site where he captured average global surface temperatures from 1866.Which of the four methods of data collection was he using?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

Jared was using published sources as his method of data collection by accessing an Internet site to gather information on average global surface temperatures from 1866. This method involves collecting data that has already been gathered and made available by others.

Question 8

At US Data Corporation's web site, they advertised that "Because of our commitment to quality and our vast amount of industry knowledge and experience, we have grown to be one of America's leading providers of mailing lists, marketing data, sales leads and research data.We maintain databases of information on consumers and businesses nationwide that set industry standards for mission critical currency, reliability and accuracy." Trying to reach 500 potential donors for their annual phone donation campaign, a local fire department purchased a list of donors from the company.This list is an example of a
A)stratified sample
B)systematic sample
C)judgment sample
D)frame

Accepted Answer

The list of donors purchased from US Data Corporation is an example of a frame, which is a list of all the individuals or units in a population from which a sample is drawn. The fire department used the frame to select potential donors for their phone donation campaign. A stratified sample involves dividing the population into subgroups and taking a random sample from each subgroup, a systematic sample involves selecting every nth individual from the population, and a judgment sample involves selecting individuals based on the researcher's judgment or expertise. None of these methods are evident in this scenario, making D the best choice.

Question 9

Which of the following is NOT a reason for the need for sampling?
A)It is usually too costly to study the whole population.
B)It is usually too time consuming to look at the whole population.
C)It is sometimes destructive to observe the entire population.
D)It is always more informative by investigating a sample than the entire population.

Accepted Answer

Option D is incorrect, as investigating the entire population is always more informative than investigating a sample. This is because the entire population contains all the possible variations and characteristics, whereas a sample only provides a representation of the population. Options A, B, and C are all valid reasons for the need for sampling.

Question 10

Which of the following sampling methods is a probability sample?
A)Convenience sample
B)Quota sample
C)Stratified sample
D)Judgment sample

Accepted Answer

A stratified sample is a probability sample, as it involves dividing the population into strata and randomly selecting individuals from each stratum. This ensures that all individuals in the population have an equal chance of being selected for the sample. The other options (convenience sample, quota sample, judgment sample) are non-probability sampling methods that do not involve random selection of individuals from the population.

Question 11

Tim was planning for a meeting with his boss to discuss a raise in his annual salary.In preparation, he wanted to use the Consumer Price Index to determine the percentage increase in his real (inflation-adjusted) salary over the last three years.Which of the 4 methods of data collection was involved when he used the Consumer Price Index?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

The Consumer Price Index is a published source that tracks changes in the prices of goods and services over time, allowing for the calculation of inflation rates. Tim did not conduct any experimentation, surveying, or direct observation in using the CPI.

Question 12

A statistics student found a reference in the campus library that contained the median family incomes for all 50 states.She would report her data as being collected using
A)a designed experiment.
B)observational data.
C)a random sample.
D)a published source.

Accepted Answer

The data was collected from a published source, meaning it was already gathered and the student did not manipulate any variables or conduct any experiments. Therefore, this is the best choice as observational data and random sampling are not applicable in this scenario.

Question 13

A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the beaches from environmental disasters.Twenty-five hundred Florida residents were surveyed.What type of data collection procedure was most likely used to collect the data for this study?
A)A designed experiment
B)A published source
C)A random sample
D)Observational data

Accepted Answer

The most likely data collection procedure used in this study is a random sample, because the survey was conducted on Florida residents without any additional manipulation or intervention by the researchers.

Question 14

The Quality Assurance Department of a large urban hospital is attempting to monitor and evaluate patient satisfaction with hospital services.Prior to discharge, a random sample of patients is asked to fill out a questionnaire to rate such services as medical care, nursing, therapy, laboratory, food, and cleaning.The Quality Assurance Department prepares weekly reports that are presented at the Board of Directors meetings and extraordinary/atypical ratings are easy to flag.Values computed from the sample results each week are called .

Accepted Answer

The answer of The Quality Assurance Department of a large...

Question 15

The Commissioner of Health in New York State wanted to study malpractice litigation in New York.A sample of 31 thousand medical records was drawn from a population of 2.7 million patients who were discharged during 2010.The proportion of malpractice claims filed from the sample of 31 thousand patients is a .

Accepted Answer

The answer of The Commissioner of Health in New York...

Question 16

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,
A)the sample could not have been random.
B)the sample may have been selected without replacement or with replacement.
C)the sample had to have been selected with replacement.
D)the sample had to have been selected without replacement.

Accepted Answer

If no subscriber was selected more than once, then this implies that the sample was selected without replacement. If it had been selected with replacement, then there would have been a chance that a subscriber could have been selected multiple times in the sample. Therefore, choice D is the best answer.

Question 17

The personnel director at a large company studied the eating habits of the company's employees.The director noted whether employees brought their own lunches to work, ate at the company cafeteria, or went out to lunch.The goal of the study was to improve the food service at the company cafeteria.This type of data collection would best be considered as
A)an observational study.
B)a designed experiment.
C)a random sample.
D)a quota sample.

Accepted Answer

In this scenario, the personnel director is simply observing and noting the eating habits of the employees without trying to manipulate or control any variables. Therefore, it is an observational study. It is not a designed experiment because there is no manipulation of variables, no control group, and no random assignment. It is also not a random or quota sample because the director is not trying to obtain a representative sample of the entire employee population at the company. Instead, the director is simply observing the employees who use the company cafeteria.

Question 18

A marketing research firm, in conducting a comparative taste test, provided three types of peanut butter to a sample of households randomly selected within the state.Which of the 4 methods of data collection is involved when people are asked to compare the three types of peanut butter?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

Experimentation is involved when individuals are asked to compare different items under controlled conditions, such as comparing three types of peanut butter to determine preferences or differences.

Question 19

Which of the following scenarios will yield a nonprobability sample?
A)The subjects of the sample are chosen based on known probability.
B)Items or individuals are chosen without regard to their probability of occurrence.
C)Every individual or item from the frame has an equal chance of being selected.Selection may be with replacement or without replacement.
D)Decide on a sample size, n; divide the frame of N individuals into groups of k individuals where k = N/n; randomly select one individual from the first group; select every kth individual thereafter.

Accepted Answer

A nonprobability sample is a sample in which the items or individuals are chosen without regard to their probability of occurrence. Choice A describes a probability sample, choice C describes a probability sample with equal probability of selection, and choice D describes a systematic sample, which is a type of probability sample.

Question 20

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 _.

Accepted Answer

The answer of The oranges grown in corporate farms in...

Quiz 1: Defining and Collecting Data

The British Airways Internet site provides a questionnaire instrument that can be answered electronically.Which of the 4 methods of data collection is involved when people complete the questionnaire?

Which of the 4 methods of data collection is involved when a person counts the number of cars passing designated locations on the Los Angeles freeway system?

Which of the following is NOT a reason for selecting a sample?

Jared was working on a project to look at global warming and accessed an Internet site where he captured average global surface temperatures from 1866.Which of the four methods of data collection was he using?

Which of the following is NOT a reason for the need for sampling?

Which of the following sampling methods is a probability sample?

A statistics student found a reference in the campus library that contained the median family incomes for all 50 states.She would report her data as being collected using

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,

A marketing research firm, in conducting a comparative taste test, provided three types of peanut butter to a sample of households randomly selected within the state.Which of the 4 methods of data collection is involved when people are asked to compare the three types of peanut butter?

Which of the following scenarios will yield a nonprobability sample?