Measurement Errors Data and Unit Conversion

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Measurement Errors Data and Unit Conversion

1. Say that someone’s body temperature is measured by four different devices and

the resulting four measurements are given below. Which reading has an absolute

error of ±0.05 °C?

A. 38 °C

B. 37.8 °C

C. 37.85 °C

D. 37.855 °C

2. What can be correctly said of data that are “normally distributed”?

A. The upper and lower values of the distribution describe the healthy range of

physiological values.

B. The standard deviation characterises the dispersion of data, and the variance

characterises the central tendency of the data.

C. The mean and range are statistics that are strictly only applicable to normally

distributed data.

D. Sixty-eight percent of all data values will be within one standard deviation

from the mean.

Measurement Errors Data and Unit Conversion

3. If someone’s height is measured while the person is wearing shoes, the height

will be overestimated. This type of error is known as which of the following?

A. Absolute error

B. Parallax error

C. Calibration error

D. Zeroing error

4. Which of the following metric prefixes is used to denote one thousandth of a

gram?

A. Micro

B. Milli

C. Centi

D. Kilo

5. What is the standard deviation used for?

A. As a measure of central tendency

B. As a measure of dispersion

C. As a measure of spread of data that are normally distributed

D. As a measure of the error of the mean value

6. A bathroom scales displays a mass reading of 68.4 kg. Which one of the following could NOT be the true mass of the person standing on the scales?

3 Measurement, Errors, Data and Unit Conversion

43

A. 68.40 kg

B. 68.44 kg

C. 68.47 kg

D. 68.37 kg

7. Which of the following g does NOT describe a milligram?

A. 1×103

g

B. 1×10−3

g

C. One thousandth of a gram

D. 0.001 g

g) is 1000 = 1 kg.

8. Look at the figure of a thermometer. What is the temperature reading?

A. 15 °C

B. 15.4 °C

C. 17 °C

D. 20 °C

9. Look again at the figure of a thermometer. What is the absolute error of the temperature reading?

A. ± 0.05 °C

B. ± 0.5 °C

3 Measurement, Errors, Data and Unit Conversion

44

C. ± 1.0 °C

D. ± 5.0 °C

10. What information does the “standard deviation” of a mean value tell us?

A. It gives us the healthy range of values for the measured physiological

quantity.

B. It is the range within which 68% of measured values are found.

C. It tells us that the measured values are normally distributed.

D. It tells us the number of values that were used to calculate the mean.

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