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Statistical Methods
Statistical Methods
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1
Which of the following statements about the median is not true?
A) It is a measure of central tendency.
D) It is equal to the mode in bell-shaped "normal" distributions.
C) It is more affected by extreme values than the arithmetic mean.
B) It is equal to Q2
2
Find the FALSE for a perfectly symmetrical bell-shaped "normal" distribution
D) The arithmetic mean equals the mode.
C) The median equals the mode.
B) The arithmetic mean does not equal the median.
A)The arithmetic mean equals the median.
3
Test №4
B) An ordinal scale variable.
C) A ratio scale variable
D) An interval scale variable
A) A nominal scale variable.
4
Test №68
b) Pooled-variance t test for the difference between two means
a) Paired t test
d) Z test for the difference between two proportions
b) Pooled-variance t test for the difference between two means
5
The
Y
-intercept (b
0
) represents the
c) predicted value of Y.
d) variation around the sample regression line.
b) predicted value of Y when X = 0.
a) change in estimated Y per unit change in X
6
Which measure of central tendency can be used for both numerical and categorical variables?
B) Median
D) Geometric mean
C) Mode
A) Arithmetic mean
7
Which of the following is a continuous quantitative (numerical) variable?
A) The color of student’s eyes
B) The amount of Milk in a 2-liter carton
D) The number of gallons of milk sold at the local grocery store yesterday
C) The number of employees of an insurance company
8
Test №15
C) 30
D) 55
A) 15
B) 27.27
9
All the events in the sample space that are not part of the specified event are called
D) the complement of the event.
B) joint events.
C) the sample space
A) simple events.
10
Test №98
c) Skewed to the right.
d) Bimodal (has more than one peak).
b) Skewed to the left.
a) Nearly symmetric
11
When using the general multiplication rule, P(A and B) is equal to
A) P(A)P(B).
B) P(B)/P(A).
D) P(A|B)P(B).
C) P(A)/P(B).
12
Test №93
a) a self-selected sample.
d) a simple random sample
c) a stratified sample.
b) cluster sample.
13
Test №74
1. 10
2. 7
3. 1
4. 3
14
The portion of the universe that has been selected for analysis is called
B) A primary data source.
D) a sample.
C) a secondary data source.
A) Frame
15
Test №7
A) All Drummand University students
D) All first-year Drummand University students.
B) All college students.
C) The 250 students that were monitored.
16
Which one of the following variables is not categorical?
c) Choice on a test item: true or false.
b) Gender of a person: male or female.
a) Age of a person.
d) Marital status of a person (single, married, divorced, other)
17
Which of the following is NOT a measure of central tendency?
A) The interquartile range.
D) The mode.
B) The arithmetic mean.
C) The geometric mean.
18
Test №26
A) 16
C) 26
D) 28
B) 25
19
Test №27
A) 28
B) 25
D) 26.5
C) 18
20
Which of the arithmetic mean, median, mode, and geometric mean are resistant measures of central tendency?
B) The mode and geometric mean only
D) The arithmetic mean and mode only
A) The arithmetic mean and median only
C) The median and mode only
21
Which of the following sampling methods is a probability sample?
D) Judgment sample
A) Convenience sample
C) Quota sample
B) Stratified sample
22
Test №99
b) 30 pounds.
a) −10 pounds.
d) 10 pounds.
c) 50 pounds
23
Test №69
c) n-2
d) n-1
b) n1 + n2 – 2.
a) n1 + n2 – 1.
24
Test №82
b) Weak
c) Moderate
a) Strong
d) No relationship
25
Test №5
C) A ratio scale variable
B) An interval scale variable
A) An ordinal scale variable
D) A nominal scale variable
26
Test №100
what values the statistic is likely to have in repeated samples
a) A parameter has a sampling distribution with the statistic as its mean
c) A statistic is used to estimate a parameter.
d) A parameter is used to estimate a statistic
27
Test №10
D) 40
A) 5
B) 11
C) 15
28
Test №83
d) have no relationship with the DJIA value
c) be low
b) be about the same value as the DJIA
a) be high
29
Test №11
A) 15
C) 40
D) 200
B) 127
30
Test №20
B) 95.44
A) 68.26
D) 93.75
C) 88.89
31
Test №3
B) A categorical variable.
D) An interval scale variable.
C) A continuous variable.
A) A discrete Variable.
32
Test №72
d) Z test for the difference between two proportions.
a) pooled-variance t test for differences between two means.
c) paired t-test for the mean difference.
b) separate-variance t test for differences between two means.
33
If the correlation coefficient (r) = 1.00, then
c) there is no explained variation.
b) the explained variation equals the unexplained variation.
d) there is no unexplained variation.
a) the Y-intercept (b0) must equal 0
34
Which of the following is a discrete quantitive (numerical) variable?
B) The Dow Jones Industrial average
C) The volume of water released from a dam
D) The distance you drove yesterday
A) The number of employees of an insurance company
35
The collection of all possible events is called
A) a simple probability.
C) a sample space.
B) a joint probability.
D) the null set.
36
The strength of the linear relationship between two numerical variables may be measured by the
b) slope
d) coefficient of correlation
c) Y-intercept.
a) scatter plot
37
Test №90
c) 0.7598
d) 2.8633
b) 0.1021
a) 0.0356
38
Test №75
a) 1
d) 3
c) 4
b) 2
39
Which of the following statistics is not a measure of central tendency?
B) Q3
A) Arithmetic mean
C) Median
D) Mode
40
Which of the following would indicate that a dataset is not bell-shaped?
a) The range is equal to 5 standard deviations.
d) There are no outliers.
b) The range is larger than the interquartile range.
c) The mean is much smaller than the median.
41
Test №12
B) 152
A) 4
C) 275
D) 388
42
Test №9
C) simple random sample
A) systematic sample
D) stratified sample
B) convenience sample
43
Test №76
A) X2 test for differences among more than two proportions
D) X2 test for independence
C) Kruskal-Wallis rank test
B) Wilcoxon rank sum test for independent populations
44
In testing for differences between the means of two independent populations, the null hypothesis is:
c) H0:M1-M2<2
a) H0 : M1-M2 = 2
b) H0:M1-M2>0
d) H0:M1-M2=0
45
The coefficient of determination (
r
2
) tells you
a) that the coefficient of correlation (r) is larger than 1.
d) that you should not partition the total variation.
c) whether r has any significance.
b) the proportion of total variation that is explained.
46
Test №66
d) n1 + n2 – 2.
c) n – 2.
a) n – 1.
b) n1 + n2 – 1.
47
Test №73
c) Z test for the difference between two proportions
a) t test for the difference between two means
b) F test for the ratio of variances
d) Separate variance t test for the difference between two means
48
Test №77
A) X2 test for differences among more than two proportions
B) X2 test for independence
C) Wilcoxon rank sum test for independent populations
D) Kruskal-Wallis rank test
49
In testing for differences between the means of two related populations, the null hypothesis is
d) H0 : MD = 0
c) H0 : MD>0
b) H0 : MD <0
a) H0 : MD = 2
50
If two events are mutually exclusive, what is the probability that both occur at the same time?
С) 0.
A) 0.50
D) Cannot be determined from the information given.
B) 1.00
51
Test №21
A) right-skewed
C) symmetrical
D) none of the above
B) not skewed
52
Test №14
D) A contingency table.
A) A stem-and-leaf display
C) A Pareto chart.
B) A time-series plot.
53
If the outcome of event A is not affected by event B, then events A and B are said to be
D) partially exclusive.
C) collectively exhaustive.
A) independent.
B) mutually exclusive.
54
The slope (b
1
) represents
b) the predicted value of Y.
a) predicted value of Y when X = 0.
d) variation around the line of regression.
c) the estimated average change in Y per unit change in X.
55
Simple probability is also called
A) joint probability
D) Bayes' theorem.
B) conditional probability.
C) marginal probability.
56
Which of the following is the easiest to compute?
B) The arithmetic mean.
C) The median.
D) The geometric mean.
A) The Mode.
57
Test №13
A) 0
B) 96
D) 4
C) 100
58
A list of 5 pulse rates is: 70, 64, 80, 74, 92. What is the median for this list?
b) 77
c) 74
d) 80
a) 76
59
Test №71
a) 14.
a) 14.
d) 7.
c) 8.
60
Which one of these statistics is unaffected by outliers?
d) Range
a) Mean
c) Standard deviation
b) Interquartile range
61
Test №22
A) 67%
C) 95%
D) 75%
B) 88.89%
