The histogram is NOT characterized by which of the following?

Select one:

a.

The histogram easily shows exact values of the distribution of a continuous variable

b.

It displays the distribution of interval- or ratio-scaled continuous variables

c.

It describes relative frequencies

d.

The vertical axis is a frequency count of items falling into category

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A frequency distribution has a standard deviation of 9. The variance is:

Select one:

a.

18

b.

15

c.

81

d.

25

e.

Not enough information is provided

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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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We have calculated a Pearson r for body weight (y) and age (x). Our result is r = -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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The mean of a frequency distribution is 32. If each score in the frequency distribution is divided by 2, the mean of the new distribution will be:

Select one:

a.

64

b.

16

c.

32

d.

not enough information provided

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Stability is a measure of:

Select one:

a.

Reliability

b.

Validity

c.

Both reliability and validity

d.

Neither reliability or validity

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Prior probability of a condition is also termed as :

Select one:

a.

Incidence of that condition

b.

Prevalence of that condition

c.

Yield of that condition

d.

None of the above

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A sensitivity of a test is 0.89; this means that:

Select one:

a.

The test misses 89% of the cases in which we are interested

b.

The test misses 11% of the cases in which we are interested

c.

89% of the time the measure tells us that there is a problem when there is none

d.

none of the above

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It is easier for a statistical test to achieve statistical significance when we conduct a:

Select one:

a.

two-tailed test

b.

non-directional test

c.

one-tailed test

d.

the direction of the statistical test does not influence statistical significance

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We have conducted a one-way ANOVA test in which we compared three population means. The calculated F equals 4.73, and the critical value of F is 3.58. Under this circumstance, we would:

Select one:

a.

reject the Null hypothesis

b.

conduct post hoc procedures

c.

fail to reject the Null hypothesis

d.

both a and b

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