RxPG - the perfect Rx for medical Post Graduate entrance blues!
Mobile Edition | Help/Newbie? | 24/7 Support
HOT | PrePG | MCQ | DNB | Careers | Books | Colleges | Dental | DocIndia | PLAB |  USMLE  | Australia | Canada | GLOBAL | OffBeat!
Articles | Forums | MCQ Crammer | Downloads | Mnemonics | Revision Tools | Recent Shouts | All Features


Biostatistics; Daily Free Online Mock Test 127 (PGI pattern)

Author: RxPG, Posted on Sunday, October 19 @ 00:00:00 IST by RxPG  

 FRIEND Add to My Pages   PRINTER Printer Friendly   FRIEND Email Story  FRIEND Download Story  PGIMS alerts 

PGIMS

Multiple Choice Test



1) A biochemical assay for a newly-discovered hormone is stated to have a reference interval of between 0 and 7 picog/dl. Suppose now that this reference interval is (arbitrarily) reduced to between 0 and 3 picog/dl.The effect of reducing the reference interval will be to:

One answer only.
   A. Increase the test's specificity.
   B. Decrease the number of false-positive results.
   C. Increase the number of false-negative results.
   D. Increase the sensitivity of the test.
   E. Not alter the test's sensitivity or specificity.





2) The most appropriate statement applied to the statistical term 'validity' is that it:

One answer only.
   A. Expresses the degree to which two things are related.
   B. Implies that the results of a test can be reproduced.
   C. Describes how well a study measures what it purports to measure.
   D. Measures the strength of relationship between cause and effect.
   E. Indicates the probability of obtaining a given result by chance alone.



3) The standard chi-squared test for a 2 by 2 contingency table is valid only if:

One answer only.
   1. Both variables are continuous.
   2. At least one variable is from a Normal distribution.
   3. All the observed frequencies are greater than five.
   4. All the expected frequencies are greater than five.
   5. All the variables form a normal distribution



4) In a chi-squared test for a 5 by 3 contingency table:

Choose 2 of the following options.
   1. Observed frequencies are compared to expected frequencies
   2. There are 15 degrees of freedom.
   3. At least 12 cells must have expected values greater than 5.
   4. All the observed values must be greater than 1.
   5. There are 5/3 degrees of freedom



5) Fisher's exact test for a contingency table:

Choose 4 of the following options.
   1. Applies to 2 by 2 tables.
   2. Usually gives a larger probability than the ordinary chi-squared test.
   3. Is suitable when expected frequencies are small.
   4. Is difficult to calculate when the expected frequencies are large.
   5. Not better than chi squared test



6) When an odds ratio is calculated from a two by two table:

Choose 4 of the following options.
   1. The odds ratio is a measure of the strength of the relationship between the row and column variables.
   2. If the order of the rows and the order of the columns is reversed, the odds ratio will be unchanged.
   3. The ratio may take any positive value.
   4. The odds ratio will be changed to its reciprocal if the order of the columns is changed.
   5. The ratio can be in negative



7) McNemar's test could be used to:

One answer only.
   1. Look at the relationship between cigarette smoking and respiratory symptoms in a group of asthmatics.
   2. Examine the change in PEFR in a group of asthmatics from winter to summer.
   3. Compare the number of cigarette smokers among a group of cancer cases and a random sample of the general population.
   4. Compare the numbers of cigarette smokers among cancer cases and age and sex matched healthy controls.
   5. None of the above



8) A new test ('T') is being evaluated for its sensititivity in diagnosing a disease state 'D'. A group of 200 patients, whose disease-state (D+ or D-) is correctly known are surveyed with the new test. The results of the survey (T+ or T-) are: D+T+ 40; D-T+ 60; D+T- 80; D-T- 20. The sensitivity of the test expressed as a percentage is:

One answer only.
   A. 20%
   B. 33%
   C. 40%
   D. 67%
   E. 90%


You can discuss the answers and queries of RxPG mediMOCKS in our new mediMOCK Discussion Forum




4 (Excellent) 3(Good) 2(Good) 1(Bad)   


Recommended Books for PGIMS
 Books to read for PGIMS by RxPG

Related PGIMS articles
 PGIMS, Chandigarh June 2005 MD/MS Examination Results
 PGIMER, Chandigarh 2005 MD/MS RESULT JANUARY, 2005 SESSION ( RANK WISE)
 PGIMER, Chandigarh 2005 MD/MS RESULT JANUARY, 2005 SESSION ( ROLL NUMBER WISE)
 PGIMER, Chandigarh 2005 Session Admission Notice
 PGI chandigarh MD/MS Exam June 2004 Results
 Online Mock Test 143 (PGI Pattern) : Medicine
 Psychiatry; Free Online Mock Test
 PGIMS December Results - Full List
 Paediatrics; Daily Free Online Mock Test 129 (PGI Pattern)
 Paediatrics; Daily Free Online Mock Test 128 (PGI Pattern)
 Biostatistics; Daily Free Online Mock Test 127 (PGI pattern)
 Anaesthesia; Daily Free Online Mock Test 126 (PGI Pattern)
 PGI Revision Series; Daily Free Online Mock Test 122
 PGI Revision Series; Daily Free Online Mock Test 121
 PGI Revision Series; Daily Free Online Mock Test 120
 PGI Revision Series; Free Online Mock Test 119
 PGIMS; Free Online Mock Test 8
 PGIMS; Free Online Mock Test 7
 PGIMS; Free Online Mock Test 6
 PGIMS; Free Online Mock Test 5

Related PGIMS Discussions

Other articles by RxPG
 RxPG Interview With Dr Sumit Seth - Civil Services 2005 Top Ranker
 Stroke - Neurology Online Mock Test 235
 Stroke - Neurology Online Mock Test 234
 Stroke - Neurology Online Mock Test 233
 List of Some Bioinformatics Courses in India
 Microbiology and Parasitology Online Mock Test 232
 DNB Online Mock Test 231
 Neurology Online Mock Test 230
 Anatomy Mock MCQ Test 229
 Anatomy Mock MCQ Test 228
 Revisable Quick List of New Drugs for PG Entrance Exams
 Radiology Daily Online Mock Test 228
 Pediatrics Free Online Daily Mock Test 227 - PGI Exam Pattern
 Paediatrics PGIMER PG Entrance Pattern Free Online Mock Test 226
 Paediatrics Free Online PG Entrance Daily Mock Test 225
 Preservatives used while packing catgut suture
 Neurology Free Online Mock Test 223
 Biostatistics Online Mock Test 222
 Neurology Free Online Medical Mock Test 221
 Neurology Free Online Medical Mock Test 220

 PGIMS FAQ
  FAQ: How do you prepare for PGI Chandigarh Exam?
  FAQ: What should be the strategy to solve PGIMER PG Entrance paper?
  FAQ: How to apply for PGIMER Chandigarh MD/MS Exam?
  FAQ: Why not topper of pgi get 100 percentile? [#]
  Browse all FAQs


Write an Article on PGIMS
You can share your exam experiences, preparation strategies, books you have read or just any information about PGIMS on RxPG website and we will publish it under your name.

Article Rating
Average Score: 4.2
Votes: 5




Most Read Article
PGIMS, Chandigarh June 2005 MD/MS Examination Results

Related Links






ARTICLE TOOLS

· PGIMS section
· Articles by RxPG
· Add to my pages
· Printer friendly version
· PDF version
· Email article
· Feedback on this article
· Medical tutorials
· Related forum posts
· Related articles
· Related downloads
· Submit article
· PGIMS alerts
· PGIMS books
· PGIMS past papers


Most read story about PGIMS:
PGIMS, Chandigarh June 2005 MD/MS Examination Results



Server Status: 134 pages served in last minute. Page generation time: 0.157 seconds

Site Maps: [Books] [News] [Forums] [Reviews] [Mnemonics]

sitemap - top30 - centuries - testimonials


About Us :: Disclaimer :: Contact Us :: Reporting abuse :: Terms of Services :: Privacy Policy

Advertise with RxPG!
Made in India by RxPG Medical Solutions Private Limited

"RxPG" is a Registered Trademark

Chrome Web Store YouTube Twitter LinkedIn Wikipedia Facebook