Chapter 32 Multiple choice questions

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. Concerning the word 'Accuracy', which of the following statements is CORRECT?

The spread of results measured for a particular data point correct incorrect

The difference between the measured value and the true value correct incorrect

A Gaussian distribution correct incorrect

Random errors correct incorrect

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. Concerning the word 'Precision', which of the following statements is CORRECT?

Systematic errors correct incorrect

The difference between the measured value and the true value correct incorrect

A Gaussian distribution correct incorrect

The spread of results measured for a particular data point correct incorrect

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. Find the mean of the following data series:
Free energy (in kJ mol^-1) ∆G = -121.6, -123.4, -120.2, -125.8, -119.9.

$\overline{\Delta G}=-120.2$ kJ mol^-1 correct incorrect

$\overline{\Delta G}=-122.8$ kJ mol^-1 correct incorrect

$\overline{\Delta G}=-121.6$ kJ mol^-1 correct incorrect

$\overline{\Delta G}=-122.2$ kJ mol^-1 correct incorrect

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. Find the mode of the following data series:
Temperature (in K): 439, 437, 441, 438, 437, 436, 441, 440, 437, 442, 440.

441 K correct incorrect

439 K correct incorrect

437 K correct incorrect

440 K correct incorrect

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. Find the median of the following data set:
emf (in V): 1.012, 1.365, 1.274, 0.926, 1.109, 1.222, 0.971.

1.109 V correct incorrect

0.926 V correct incorrect

1.126 V correct incorrect

1.012 V correct incorrect

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. Find the median of the following data set:
Time (in s): 25, 22, 30, 32, 24, 23, 30, 27.

26 correct incorrect

28 correct incorrect

27 correct incorrect

30 correct incorrect

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. Find the sample standard deviation of the following set of data:
∆H (in kJ mol^-1): 439.2, 432.7, 436.1, 438.5, 441.9, 433.8, 442.7, 437.3
(without using the function keys on a calculator).

1.3 kJ mol^-1 correct incorrect

3.3 kJ mol^-1 correct incorrect

12.6 kJ mol^-1 correct incorrect

3.6 kJ mol^-1 correct incorrect

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. Find the sample standard deviation of the following set of data:
Marks (%): 26, 72, 68, 33, 39, 58, 86, 84, 48, 55, 62, 63, 59, 61
(using the function keys on your calculator).

60% correct incorrect

58% correct incorrect

17% correct incorrect

26% correct incorrect

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. There is one data point which looks suspicious in the list below:
Length (in cm): 2.86, 2.87, 2.83, 2.69, 2.81, 2.88.
Use a Q-test to ascertain the confidence with which we could reject the suspect point.

The point can be rejected with a confidence > 95% but < 99%. correct incorrect

The point cannot be rejected with a confidence > 90%. correct incorrect

The point can be rejected with a confidence > 90% but < 95%. correct incorrect

The point can be rejected with a confidence > 99%. correct incorrect

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. The temperature at which 5 g of a compound dissolves into 6 cm³ of water is measured a number of times.
Temperature (in °C): 59.2, 61.4, 70.9, 63.2, 63.0, 62.5, 61.9, 60.5. There is one data point which looks suspicious in the list below:
Use a Q-test to ascertain the confidence with which we could reject the suspect point.

The point cannot be rejected with a confidence > 90%. correct incorrect

The point can be rejected with a confidence > 99%. correct incorrect

The point can be rejected with a confidence > 95% but < 99%. correct incorrect

The point can be rejected with a confidence > 90% but < 95%. correct incorrect