Tutorial 2

Question 1

Which of the following is in order of nominal, ordinal, and interval/ratio data?
A) grade of intestinal mucosal thickening, breed, serum albumin concentration
B) breeds grade of intestinal mucosal thickening, serum album concentrations
C) none of the above

Answer 1

B) breeds grade of intestinal mucosal thickening, serum album concentrations

Question 2

A series of measurement that centre around the tree underlying value of the variable being measured with a large amount of spread around the centre point is said to be
A) accurate and precise
B) accurate but imprecise
C) inaccurate and precise

Answer 2

B) accurate but imprecise

Question 3

The following are survival times recorded for 6 tumour bearing rats: 1.4, 1.7, 2.3, 2.5, 3.2, 3.8, what if 3.8 was actually 38 months what effect would this have

a) increase in median
b) increase in mode
c) increase in mean
d) increase in both the median and the mean

Answer 3

c) increase in mean

Question 4

How are numerical summaries affect by a frequency distribution that has a tail to the right

a) the mean and median are equal
b) the mean is larger than the median
c) the median is larger than the mean
d) the mode is unaffected

Answer 4

b) the mean is larger than the median

d) the mode is unaffected

Question 5

In a series of clinical measurement, the degree of spread of the values around the centre can be expressed as

a) median
b) range
c) mean
d) standard deviation

Answer 5

d) standard deviation

Question 6

What term refers to the systemic variation in a series of clinical measurements

Answer 6

Bias

Question 7

What term refers to a series of clinical measurements that on the average, equal the underlying value of the variable being measured

Answer 7

accuracy

Question 8

What term describes the degree to which a series of measurements fluctuate around a central value

Answer 8

Precision

Question 9

What term describes the type of variation that in general results in valves above or below the true value with equal probability

Answer 9

chance

Question 10

Outline a randomised controlled clinical trial example

Answer 10

1-formulate hypothesis
2-select participates
3-Allocate subjects to comparison groups
4-Administer treatment and measure outcome
5-Analyse data

Question 11

LOOK AT QUESTION 7 ON TUTORIAL 2

Answer 11

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