This preview shows pages 1–3. Sign up to view the full content.
MIDTERM EXAM MATH 302
True/False
Please indicate if the following statements are true or false.
1.
The variable of height is an example of a quantitative variable.
2.
Rating a restaurant by a number of stars is an example of an ordinal level of
measurement.
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.
4.
In the following chart, the height is the independent variable and the age of the
tree is the dependent variable.
5.
The
lower class limit
represents the smallest data value that can be included in
the class.
6.
The cumulative frequency is the sum of the frequencies accumulated to the
upper boundary of a class in the distribution.
7.
A frequency polygon and a histogram have the same overall shape.
8.
A histogram is a graph that represents the cumulative frequencies for the classes
in a frequency distribution.
9.
A stem and leaf plot is useful for keeping more precision than a grouped
frequency distribution.
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.
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.
13.
The mode of a set of data can be computed only when the data is numeric.
14.
The median can be a more appropriate measure of central tendency if the
distribution of the data is extremely skewed.
15.
The coefficient of variation is the mean divided by the standard deviation
expressed as a percentage.
1
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentMIDTERM EXAM MATH 302
16.
Two events are mutually exclusive if they cannot occur at the same time.
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.
18.
The number of different arrangements of four pictures from a selection of ten
pictures is 5,040.
19.
Continuous random variables are obtained from data that can be measured rather
than counted.
20.
Discrete variables have values that can be measured.
21.
If the standard deviation of a probability distribution is 6.25, the variance is 2.30.
22.
The probability of a success must remain the same for each trial in a binomial
experiment.
23.
When sampling is done without replacement, the binomial distribution does not
give exact probabilities because the trials are not independent.
24.
When the majority of the data values fall to the right of the mean, the
distribution is said to be left skewed.
25.
The normal distribution curve can be used as a probability distribution curve for
normally distributed variables.
26.
This is the end of the preview. Sign up
to
access the rest of the document.
 Spring '11
 Abrams
 Math, Statistics

Click to edit the document details