MIDTERM EXAM MC306
True/False
Please indicate if the following statements are true or false.
1.
The variable of height is an example of a quantitative variable.
True
2.
Rating a restaurant by a number of stars is an example of an ordinal level of
measurement.
True
3.
In a research study, it is always preferable for the researcher to choose his
participants as carefully as possible rather than randomly accept samples.
False
4.
In the following chart, the height is the independent variable and the age of the
tree is the dependent variable.
False
5.
The
lower class limit
represents the smallest data value that can be included in
the class
. True
6.
The cumulative frequency is the sum of the frequencies accumulated to the
upper boundary of a class in the distribution.
True
7.
A frequency polygon and a histogram have the same overall shape.
True
8.
A histogram is a graph that represents the cumulative frequencies for the classes
in a frequency distribution.
False
9.
A stem and leaf plot is useful for keeping more precision than a grouped
frequency distribution.
True
10.
A time series graph represents data that occur over a specific period.
11.
A time series graph is useful for detecting long term trends over a period of time.
True
12.
A stem and leaf plot is a data plot that uses part of a data value as the stem and
part of the data value as the leaf to form groups or classes.
True
13.
The mode of a set of data can be computed only when the data is numeric.
False
14.
The median can be a more appropriate measure of central tendency if the
distribution of the data is extremely skewed.
True
15.
The coefficient of variation is the mean divided by the standard deviation
expressed as a percentage.
False
1
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MIDTERM EXAM MC306
16.
Two events are mutually exclusive if they cannot occur at the same time.
True
17.
When the outcome or occurrence of the first event does not affect the outcome or
occurrence of the second event in such a way that the probability is changed, the
events are said to be dependent.
True
18.
The number of different arrangements of four pictures from a selection of ten
pictures is 5,040.
True
19.
Continuous random variables are obtained from data that can be measured rather
than counted.
True
20.
Discrete variables have values that can be measured.
True
21.
If the standard deviation of a probability distribution is 6.25, the variance is 2.30.
False
22.
The probability of a success must remain the same for each trial in a binomial
experiment.
True
23.
When sampling is done without replacement, the binomial distribution does not
give exact probabilities because the trials are not independent.
True
24.
When the majority of the data values fall to the right of the mean, the
distribution is said to be left skewed
. True
25.
The normal distribution curve can be used as a probability distribution curve for
normally distributed variables.
True
26.
The total area under the normal distribution curve is approximately 0.99 but can
never be equal to 1.0.
False
27.
The area under the normal distribution curve that lies within three standard
deviations of the mean is approximately 95%.
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 Spring '10
 Mehala
 Normal Distribution, Standard Deviation, Probability theory, MIDTERM EXAM MC306, C C D C C B B, C D C B C

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