# Introduction To Research - Test 2

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Safa.marwan2000
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Quizzes Created: 4 | Total Attempts: 2,883
Questions: 10 | Attempts: 747

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• 1.

### Prevalence is the number of new cases in a population.

• A.

True

• B.

False

B. False
Explanation
Prevalence is the number of new and old cases in a population.
Incidence is the number of new cases in a population.

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• 2.

### Sensitivity is the ability of a test to correctly identify those who have the disease, while specificity is its ability to identify those who don't have the disease.

• A.

True

• B.

False

A. True
Explanation
This statement is true because sensitivity refers to the test's ability to correctly identify individuals who have the disease, meaning it has a low rate of false negatives. On the other hand, specificity refers to the test's ability to correctly identify individuals who do not have the disease, meaning it has a low rate of false positives. So, sensitivity and specificity are both important measures of a test's accuracy in diagnosing a disease.

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• 3.

### The fecal immunochemical test is a screening test for colon cancer. If its specificity was 60% and its sensitivity was 80% and the negative predictive value was 25%. What is the prevalence of colon cancer?

• A.

0.9 (90%)

• B.

0.85 (85%)

• C.

0.8 (80%)

• D.

0.95 (95%)

A. 0.9 (90%)
Explanation
Use Bayes' rule and solve for P(D).

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• 4.

### HIV antibody conformation test is a screening test for AIDS. Based on the table below, what is the probability of getting a negative test if the person is infected?   Test positive Test negative AIDS positive 420 90 AIDS negative 280 210

• A.

9/51

• B.

42/51

• C.

9/49

• D.

21/49

A. 9/51
Explanation
Find the probability of getting a false negative test.

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• 5.

### Verbal fluency test is a screening test used for dementia. Based on the table below, what is probability of getting a negative reult that is really negative?   Dementia positive Dementia negative Positive test 640 100 Negative test 160 100

• A.

10/26

• B.

16/26

• C.

64/74

• D.

10/74

A. 10/26
Explanation
Find the negative predicted value (NPV).

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• 6.

### The largest collection of entities for which there is an interest at a particular time is:

• A.

Population

• B.

Sample

• C.

Inference

• D.

Statistic

A. Population
Explanation
The largest collection of entities for which there is an interest at a particular time is referred to as the population. In statistics, a population is the entire group being studied, which can be individuals, objects, or events. It represents the complete set of elements that possess the characteristics of interest to the researcher. By studying the entire population, researchers aim to make generalizations and draw conclusions about the entire group, rather than just a subset or sample.

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• 7.

### Permitting examination of past trends is an advantage of which data collection techniques?

• A.

Using available information

• B.

Observing

• C.

Interviewing

• D.

A. Using available information
Explanation
Using available information allows for the examination of past trends because it involves gathering and analyzing existing data that has already been collected. This can include data from various sources such as research studies, surveys, reports, and databases. By utilizing available information, researchers can identify patterns, trends, and relationships over time, which can provide valuable insights and inform decision-making processes.

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• 8.

### Time consuming is a disadvatage of which type of non-probablistic sampling?

• A.

Judgment sampling

• B.

Quota sampling

• C.

Convenience sampling

• D.

2 of the answers are correct

D. 2 of the answers are correct
Explanation
Both judgment sampling and quota sampling are time consuming.

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• 9.

### An advantage of snowball sampling is that it is dependant

• A.

True

• B.

False

B. False
Explanation
A disadvantage of snow ball sampling is that it is not independant (it is dependant).

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• 10.

### Interviewing is a data collection method that is suitable for illiterate.

• A.

True

• B.

False

A. True
Explanation
Interviewing is a data collection method that is suitable for illiterate individuals because it involves conducting face-to-face or verbal interviews, where the interviewer asks questions and records the responses provided by the interviewee. This method does not require reading or writing skills, making it accessible for illiterate individuals to participate and provide their answers orally.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• May 05, 2020
Quiz Created by
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