BIOSTATISTICS question (No Explanation needed please)

The probability of event A occurring conditional that event B has occurred is 22.5%. The probability of event B occurring conditional that event A has occurred is 10.0%. Prior probability of event A is 9.0%. Given this information, calculateprior probability of event B.

Select one:

a.

5.5%

b.

7.0%

c.

4.0%

d.

0.04%

e.

25.0%

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The correlation between a continuous and a dichotomous variables cannot be assessed

Select one:

True

False

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You want to measure the level of patients' satisfaction with a set of health services newly introduced to a community practice. You decided to investigate that through a survey question with a 5-point Likert-type scale consisting of statements that measure level of satisfaction with the health care service. The Likert scale ranged from 1 to 5; where 1=highly satisfied, 2=satisfied, 3=cannot decide, 4= not satisfied, and 5=totally not satisfied.

After reviewing the survey, you decide that the mode might be the more appropriate measure of central tendency for this variable. In reporting the mode, you are treating the variable as:

Select one:

a.

ordinal

b.

ratio

c.

nominal

d.

interval

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A new non-invasive diagnostic test to detect breast cancer was developed in Australia

		Cancer diagnosis according to invasive pathology testing (or Gold Standard)
		With cancer	Without cancer
New diagnostic test result	Positive	40	5
Negative	10	80

Based on the results presented in above table, the new diagnostic test has a yield of:

Select one:

a.

89%

b.

80%

c.

94%

d.

Not enough information to calculate it

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Linearity in relationships between two continuous variables is best spotted by a:

Select one:

a.

box plot diagram

b.

pie graph

c.

scatterplot

d.

none of the above

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In a geographical region, it was found that women were five times more likely than men to be diagnosed with a serious illness. Although the incidence rate was higher in females, the prevalence rate of the disease was the same in both males and females. This can be explained by the following:

Select one:

a.

The duration of the condition is shorter in women

b.

More women die of this illness compared to males

c.

Case-fatality rate is the same in both males and females

d.

Women may be better screened for the illness than their male counterparts

e.

Answers a, b and d

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We have calculated a Pearsonrfor body weight (y) and age (x). Our result isr= -0.16. Which of the statements below is correct?

Select one:

a.

as age increases, the weight decreases

b.

as ages increases, weight increases

c.

we cannot predict weight from age

d.

we have made an error in our calculation

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To transform a raw score to a z score, you do not need the:

Select one:

a.

variance

b.

standard deviation

c.

mean

d.

median

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The statistical test that compared the effect of exposure to pollen and a health outcome produced a significant finding at p value of 0.01. This association will:

Select one:

a.

also be significant at a p value of 0.05

b.

also be significant at a p value of 0.001

c.

not be significant at a p value of 0.05

d.

both a and b

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The intercept in a linear regression model is:

Select one:

a.

the difference between the observed and expected values

b.

the change in Y for a unit change of X

c.

the value of Y when x is zero

d.

none of the above