Biostatistics
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Question 1 of 50
1. Question
1. Laparoscopy was used to diagnose cyst. Its sensitivity was 90 % and specificity was 90 %, what will be false positive rate?
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Question 2 of 50
2. Question
2. Laparoscopy was used to diagnose cyst. Its sensitivity was 10 % and specificity was 90 %, what will be false negative rate?
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Question 3 of 50
3. Question
3. New drug was introduced in a trial. The incidence of adverse outcome reported was 65%. Whereas in those who received placebo drug the incidence of adverse outcome reported was 80%. What is the absolute risk reduction?
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Question 4 of 50
4. Question
4. When does the Odds ratio approximate risk ratio:
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Question 5 of 50
5. Question
5. A tumor marker is revolutionized for detection of endometrial cancer, 60 women included in study, however confirmatory test shows only 40 have ca endometrium, 8 of them tested negative with new marker. What is the sensitivity of test?
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Question 6 of 50
6. Question
6. Histogram is used to summarise which of the variable
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Question 7 of 50
7. Question
7. Which of the following is true about Type 1 error?
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Question 8 of 50
8. Question
8. What is true about Standard error of mean (SEM)?
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Question 9 of 50
9. Question
9. Statistical heterogeneity indicates
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Question 10 of 50
10. Question
10. Gestational age in weeks is which type of variable?
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Question 11 of 50
11. Question
11. 32 women got conceived following ovulation suppression and 10 did not. 40 women got conceived following placebo and 10 did not. The common odds ratio for pregnancy following ovulation suppression versus placebo or no treatment was how much?
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Question 12 of 50
12. Question
12. What do the bottom and top represent on the boxandwhisker plot?
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Question 13 of 50
13. Question
13. Out of 100 women screened for ectopic using a new test 30 tested positive for ectopic. However only 27 women actually were ectopic according to gold standard USG plus Beta HCG test. What is the sensitivity of the new test?
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Question 14 of 50
14. Question
14. Out of 100 babies with APGAR score more than 7, 30 of them had outcome of neonatal mortality and morbidity. Out of 100 babies with APGAR score less than 7, 60 of them had outcome of neonatal mortality and morbidity. What are the odds of neonatal mortality in APGAR score < than 7 compared to > than 7?
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Question 15 of 50
15. Question
15. The null hypothesis states that a given variable is without effect. What type of error is present when the null hypothesis is incorrectly not rejected?
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Question 16 of 50
16. Question
16. What is the best description of power?
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Question 17 of 50
17. Question
17. Which statistical value provides details of how close a sample mean is to the population mean?
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Question 18 of 50
18. Question
18. Probability is the measure of a given observation occurring by chance and is denoted by symbol P. what value of P indicates that an observation will definitely occur?
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Question 19 of 50
19. Question
19. 100 women with heavy post menopausal bleeding were taken papillary endometrial biopsy prior to hysterectomy, to test the ability of the biopsy to detect endometrial cancer.
What is the specificity of the endometrial biopsy?
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Question 20 of 50
20. Question
20. A new antenatal screening test to assess the level of cervical effacement in threatened pre term delivery has been developed. In trials this test has a high degree of specificity. What is the definition of the term specificity?
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Question 21 of 50
21. Question
21. Junior doctor has carried out research product in the early pregnancy unit low serum progesterone at 6 weeks of gestation has been evaluated for its ability to predict firstÂ trimester miscarriage 200 women were recruited the results are as followsÂ
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Question 22 of 50
22. Question
22. The following is the gestation age of women in weeks with Pregnancy induced hypertension recruited for a drug trial. 20, 22, 21, 23, 19, 24, 25, 26, 28, 30 and 22 weeks. What is the median gestational age?
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Question 23 of 50
23. Question
23. Standard error of mean is calculated by
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Question 24 of 50
24. Question
24. Mean systolic blood pressure (SBP) of 36 women with PIH was 162 mm Hg. SD of SBP was 18 mm Hg. What is the SEM (Standard error of mean)?
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Question 25 of 50
25. Question
25. What represent the 2 axis of ROC curve?
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Question 26 of 50
26. Question
26. Calculate the odds of asymmetrical IUGR and symmetrical IUGR for Apgar < 7
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Question 27 of 50
27. Question
27. You are carrying out analysis of a new test for DVTs and decide to plot a receiver operating characteristic curve. What are the axis of the curve?
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Question 28 of 50
28. Question
28. A publication reports the outcome of a new therapy in a placebo controlled primary prevention of venous thromboembolism (VTE). 200 patients were randomized to receive the new therapy and 200 allocated to placebo. The study was completed over a 2 year period. In the placebo group there were 20 having venous thromboembolism and in the group treated with the new therapy there were 10 having venous thromboembolism. What is the number needed to treat to prevent one VTE over the course of this study?
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Question 29 of 50
29. Question
29. What type of variable is ABO Blood Group?
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Question 30 of 50
30. Question
30. For preterm birth (PTB) prediction risk within 7 days of testing in pregnant women with cervical length between 1530 mm , PAMG1 test (placental alpha microglobulin1) in cervicovaginal secretions collected immediately following transvaginal ultrasound (TVUS) of women with signs and symptoms of preterm labour was done. This study included 200 women. 175 of the women who tested positive with PAMG test delivered PTB. 25 of the women who tested negative delivered PTB. What is the sensitivity of PAMG test?
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Question 31 of 50
31. Question
31. With regards to a screening test in relation to the diagnostic test of a disease, the results have yielded the following 2×2 contingency table:
What is the specificity of the test?
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Question 32 of 50
32. Question
32. Body mass index (BMI) is known to be normally distributed across the population with a mean of 25 and standard deviation of 5. How many out of 100 patients in a population will be obese?
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Question 33 of 50
33. Question
33. In a study of 100 women presenting with symptoms of preterm labour, a cervicovaginal fetal fibronectin (fFN) test was assessed in predicting spontaneous preterm birth (PTB). The following results were obtained:
What is the Negative predictive value (NPV) of this test?
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Question 34 of 50
34. Question
34. An investigator compares a chart of hemoglobin (HbA1c) levels in two groups of gestational diabetes patients: those who take standard and new drug. Assume the (HbA1c) levels of both groups were found to be positively skewed distribution. A logarithmic transformation was taken to be symmetrise. Which of the following tests is most likely to be employed by the investigator to analyze the study results?
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Question 35 of 50
35. Question
35. The following table shows the following results:
What is the positive predictive value of the new test?
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Question 36 of 50
36. Question
36. In a given sample for a group of size 16, the standard deviation of the data is 12 and the mean is 2. What is the standard error of mean (SEM)?
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Question 37 of 50
37. Question
37. A publication reports the outcome of a new therapy in a placebo controlled primary prevention of venous thromboembolism (VTE). 200 patients were randomised to receive the new therapy and 200 allocated to placebo. The study was completed over a 2 year period. In the placebo group there were 100 have venous thromboembolism and in the group treated with the new therapy there were 50 have venous thromboembolism. What is the number needed to treat to prevent one VTE over the course of this study?
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Question 38 of 50
38. Question
38. In an investigation to study the effect of smoking in cancer cervix, it is observed that 30 of the 60 patients were smokers as compared to 20 out of 60 control subjects. The odds ratio of cancer cervix associated with smoking will be?
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Question 39 of 50
39. Question
39. The number of hours worked per week for a sample of ten students is shown below.
Â
Students
Â
Hours
Â
1
Â
20
Â
2
Â
0
Â
3
Â
18
Â
4
Â
16
Â
5
Â
22
Â
6
Â
40
Â
7
Â
8
Â
8
Â
6
Â
9
Â
30
Â
10
Â
40
What is the mode of the above data?
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Question 40 of 50
40. Question
40. One researcher wishes to assess the postoperative recovery for a group of postmenopausal women who had a hysterectomy. He classified the patients as fell “worse,” “same,” or “improve”. Which level of measurement is this classification?
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Question 41 of 50
41. Question
41. Mann whitney U test is
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Question 42 of 50
42. Question
42. What level of measurement uses a verbal scale to measure data; slight, moderate and severe?
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Question 43 of 50
43. Question
43. Mean hemoglobin of a sample of 100 pregnant women was found to be 10 mg% with a variance of 1.0 mg%. The standard error of the estimate would be:
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Question 44 of 50
44. Question
44. Which statistical test requires a normal population distribution?
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Question 45 of 50
45. Question
45. What is the correct formula to calculate the positive predictive value? If TP = true positive; FP = false positive; TN = true negative; FN = false negative
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Question 46 of 50
46. Question
46. A revolutionary tumour marker has been trialed for detecting endometrial carcinoma. 140 women were included in the trial; the result shows that 90 women had a positive tumour marker however only 30 had endometrial cancer. 5 women who had endometrial cancer were negative for the tumour marker. The sensitivity of the new tumour marker is
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Question 47 of 50
47. Question
47. Forest plot: horizontal lines represent
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Question 48 of 50
48. Question
48. What is represented by the equation Sensitivity/(1specificity)?
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Question 49 of 50
49. Question
49. Sample size 30, variance 25 and standard error of mean 3. What is the data set’s Standard deviation?
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Question 50 of 50
50. Question
50. The following is a plot
This type of plot is used for which type of analysis?
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