DTA 565 practice questions

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Which statement is false? Explain.

If μ = 52 and σ = 15, then X = 81 would be an outlier.

Three randomly chosen Seattle students were asked how many round trips they made to Canada last year. Their replies were 3,4,5. The geometric mean is ____________.

3.915

The mean absolute deviation is __________.

the average of all absolute deviations

Statistics for a sample are denoted by _____.

x̄, s2

The mean of a sample and standard deviation of a population are denoted by _______.

x̄, σ

The quartiles of a distribution are most clearly revealed in which display?

box plot

The mode is the least appropriate for _____________.

continuous data

Twelve randomly chosen students were asked how many times they had missed class during a certain semester, with this result: 3, 2, 1, 2, 1, 5, 9, 1, 2, 3, 3, 10. The geometric mean is ___________.

2.604

Is the set of all the footballs in the world a sample or population?

Population

True or False: A sample set consists of randomly selected points from a population.

True

Which is not true of the Empirical Rule?

it applies to any distribution

Which of the following is true?

line charts are not used fro cross-sectional data

When a sample has an odd number of observations, the median is the ________________.

observation in the center of the data array

Estimating the mean from grouped data will tend to be most accurate when ___________.

observations are distributed uniformly within classes.

Which has more data points; a sample or a population?

population

There are ten sections of a math course at a university. One section is randomly chosen for a survey about calculator preferences. The group of students in this section is a _____.

sample

The symbol ∑ is used to denote __________.

sum of data

Absolute deviations are _____________

always positive

From its 32 regions, the FAA selects 6 regions, and then randomly audits 25 departing commercial flights in each region from compliance with legal fuel and weight requirements. This is an example of ________.

cluster sampling


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