List of top Medical Laboratory Technology Questions on Biostatistics asked in CUET (PG)

Fig. shows repeated glucose measurement for a single sample. Choose the correct findings from the following statements. 

LIST: 
A. Instrument A is precise and unbiased. 
B. Instrument B is precise and biased. 
C. Instrument B has a positive bias. 
D. Instrument C has only positive bias. 
E. Instrument C is unbiased. 
 

A study of 50 individuals found mean systolic blood pressure $\bar{x} = 124.6$ mm Hg with sample standard deviation $S = 10.3$ mm Hg. Find the no. of individuals needed to reduce the standard error of the mean to 1 mm Hg.
Some study on human pregnancies were conducted and it is found that, human pregnancies have a gestation period that is approximately normal with $\mu = 39$ weeks and $\sigma = 2$ weeks. What is the z-score for a pregnancy that lasts 36 weeks?
Random error associated with sampling and randomization are effectively addressed by confidence and hypothesis tests. These methods fail to address systematic errors. Systematic errors come in which of the following forms?
LIST:
A. Confounding bias
B. Information bias
C. Selection bias
D. Direction bias
E. Random bias
Choose the correct statements about chi-square probability density function.
LIST:
A. They start at 0.
B. They are Symmetrical.
C. They have a mean equal to their degree of freedom.
D. They have variance equal to degree of freedom.
E. They have variance equal to 2 $\times$ degree of freedom.
A Screening test has a sensitivity of 0.89 and a false-positive rate of 0.01. The test is used in a population that has a disease prevalence of 0.002. Given a positive result, find the probability of having the disease.
Four patients are treated with an intervention that is successful 90% of the time. What is the probability of two successes?