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Biostatistics
(Single Best Answer) Question 1: The number of malaria cases reported during the last 10 years in a town are given below: 250,320,190,300,5000,100,260,350,320& 160. The epidemiologist wants to find out the average number of malaria cases reported in that town during the last 10 years. The most appropriate measure of average for this data will be ?
A) Arithmetic mean
B) Mode
C) Median
D) Geometric mean
Answer (Select an option above to get the answer):
(Single Best Answer) Question 2: An investigator wants to study the association between maternal intake of iron supplements (Yes or No) and incidence of low birth weight (<2500 or >= 2500 gms). He collects relevant data from 100 pregnant women as to the status of usage of iron supplements and the status of low birth weight in their newborns. The appropriate statistical test of hypothesis advised in this situation is ?
A) Paired t-test
B) Unpaired or independent t-test
C) Analysis of variance
D) Chi-Square test
Answer (Select an option above to get the answer):
(Single Best Answer) Question 3: After applying a statistical test, an investigator gets the 'p value' as 0.01. It means that ?
A) The probability of finding a significant difference is 1%
B) The probability of declaring a significant difference, when there is truly no difference, is 1%
C) The difference is not significant 1% times and significant 99% times
D) The power of the test used is 99%
Answer (Select an option above to get the answer):
(Single Best Answer) Question 4: The fasting blood levels of glucose for a group of diabetics is found to be normally distributed with a mean of 105 mg per 100 ml of blood and a standard deviation of 10 mg per 100 ml of blood. From this data, it can be inferred that approximately 95% of the diabetics will have their fasting blood glucose levels within the limits of ?
A) 75 and 135 mgs
B) 85 and 125 mgs
C) 95 and 115 mgs
D) 65 and 145 mgs
Answer (Select an option above to get the answer):
(Single Best Answer) Question 5: The Hb level in healthy women has mean 13.5 g/dl and standard deviation 1.5 g/dl, what is the Z score for a woman with Hb level 15.0 g/dl ?
A) 9.0
B) 10.0
C) 2.0
D) 1.0
Answer (Select an option above to get the answer):
(Single Best Answer) Question 6: Total Cholesterol level = a + b (calorie intake) + c (physical activity) + d (body mass index); is an example of ?
A) Simple linear regression
B) Simple curvilinear regression
C) Multiple linear regression
D) Multiple logistic regression
Answer (Select an option above to get the answer):
(Single Best Answer) Question 7: The events A and B are mutually exclusive, so ?
A) Prob (A or B) = Prob (A) + Prob (B)
B) Prob (A and B) = Prob (A).Prob (B)
C) Prob (A) = Prob (B)
D) Prob (A) + Prob (B) = 1
Answer (Select an option above to get the answer):
(Single Best Answer) Question 8: The PEFR of a group of 11 year old girls follow a normal distribution with mean 300 l/min and standard deviation 20 l/min ?
A) About 95% of the girls have PEFR between 260 and 340 l/min
B) The girls have healthy lungs
C) About 5% of girls have PEFR below 260 l/min
D) All the PEFR must be less than 340 l/min
Answer (Select an option above to get the answer):
(Single Best Answer) Question 9: The standard normal distribution ?
A) Is skewed to the left
B) Has mean = 1.0
C) Has standard deviation = 0.0
D) Has variance = 1.0
Answer (Select an option above to get the answer):
(Single Best Answer) Question 10: For a negatively skewed data mean will be ?
A) Less than median
B) More than median
C) Equal to median
D) One
Answer (Select an option above to get the answer):
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