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HI6007 Quiz
HI6007 Quiz
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1
Which of the following is not an example of descriptive statistics?
histogram depicting the age distribution for 30 randomly selected students
a table summarizing the data collected in a sample of new-car buyers
an estimate of the number of Alaska residents who have visited Canada
the proportion of mailed-out questionnaires that were returned
2
Quantitative data that measure how many are ________; quantitative data that measure how much are ________.
continuous; discrete
interval; ratio
discrete; continuous
ratio; interval
3
Bayes' theorem is used to compute
the union of events
the posterior probabilities
the prior probabilities
both the prior probabilities and the union of events
4
The 75th percentile is also the
second quartile
third quartile
first quartile
fourth quartile
5
If P(A) = 0.5 and P(B) = 0.5, then P(A ∩ B) is
cannot be determined from the information given
0.25
0.00
1.00
6
Excel's __________ can be used to construct a frequency distribution for categorical data
COUNTIF function
FREQUENCY function
DISTRIBUTION function
SUM function
7
"Top3" at a race consists of picking the correct order of the first 3 horses in a race. We have 10 horses, how many top3
10
1,814,400
720
302,400
8
The range of probability is
zero to one
any value between minus infinity to plus infinity
any value larger than zero
any value between -1 to 1
9
For this Excel worksheet, which formula below would correctly calculate the posterior probability for cell E3?
B3/C3+D3
=SUM(B3:D3)
=D3/D5
=D5/D3
10
If A and B are independent events with P(A) = 0.05 and P(B) = 0.65, then P(A⏐B) =
0.65
0.05
0.8
0.0325
11
Facts and figures that are collected, analysed and summarized for presentation and interpretation are
Both variables and elements are correct.
data
variables
elements
12
The probability of at least one head in two flips of a coin is
0.75
0.33
0.50
1.00
13
Excel's __________ function can be used to compute the population variance.
MAX
VAR
None of the other answers are correct.
MODE
14
A graphical method that can be used to show both the rank order and shape of a data set simultaneously is a
stem-and-leaf display
pie chart
relative frequency distribution
pivot table
15
The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals
0
8
6,561
4096
16
Which of the following is an example of categorical data?
height, in meters, of a diving board
social security number
number of square feet of carpet
score on a multiple-choice exam
17
If P(A) = 0.38, P(B) = 0.83, and P(A ∩ B) = 0.57; then P(A ∪ B) =
1.78
0.64
1.21
0.78
18
Revised probabilities of events based on additional information are
posterior probabilities
marginal probabilities
joint probabilities
complementary probabilities
19
The complement of P(
A
|
B
) is
P(A| BC)
P(B| A)
P(AC | B)
P(AI B)
20
When using Excel's POISSON.DIST function, one should choose TRUE for the third input if
a cumulative probability is desired
a probability is desired
the correct answer is desired
the expected value is desired
21
For this Excel worksheet, which of the following formulas would correctly calculate the joint probability for cell D3?
=B3*C3
B3/C3
=SUM(B3:C3)
B3+C3
22
An experiment consists of four outcomes with P(E1) = 0.2, P(E2) = 0.3, and P(E3) = 0.4. The probability of outcome E4 is
0.024
0.500
0.900
0.100
23
The symbol
σ
2 is used to represent the
standard deviation of the population
variance of the population
standard deviation of the sample
None of the other answers are correct.
24
If P(A) = 0.85, P(A ∪ B) = 0.72, and P(A ∩ B) = 0.66, then P(B) =
0.28
0.18
0.15
0.53
25
The coefficient of variation equals
203.12%
0.20312%
11.25%
0.1125%
26
The numbers of hours worked (per week) by 400 statistics students are shown below.
75%
25%
20%
80%
27
Excel's __________ function can be used to compute the sample variance.
MAX
STDEV
VAR.S
MODE
28
If P(A) = 0.50, P(B) = 0.60, and P(A ∩ B) = 0.30; then events A and B are
Not enough information is given to answer this question.
independent events
not independent events
mutually exclusive events
29
Any process that generates well-defined outcomes is
a sample point
None of the other answers is correct.
an event
an experiment
30
The number of observations in a complete data set having 10 elements and 5 variables is
10
25
50
5
31
The
z
-score for a sales associate from this store who earns $28,000 is.
-1.8
1.8
28
0.78
32
The entities on which data are collected are
elements
samples
sets
populations
33
The interquartile range is
the difference between the third quartile and the first quartile
another name for the variance
the 50th percentile
the difference between the largest and smallest values
34
Calculate the mean
6
8
5
7
35
Of five letters (A, B, C, D, and E), two letters are to be selected at random. How many possible selections are there?
7
20
5!
10
36
If A and B are mutually exclusive events with P(A) = 0.3 and P(B) = 0.5, then P(A ∩ B) =
0.30
0.15
0.00
0.20
37
A tabular summary of a set of data showing the fraction of total number of items in several nonoverlapping classes is
cumulative frequency distribution.
frequency.
frequency distribution.
relative frequency distribution.
38
Z
is a standard normal random variable. The P(
z
≥ 2.11) equals
0.9821
0.5
0.4821
0.0174
39
Which of the following descriptive statistics is not measured in the same units as the data?
35thpercentile
variance
interquartile range
standard deviation
40
The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds.
The probability of a player weighing less than 250 pounds is 0.4772
The probability of a player weighing less than 250 pounds is 0.0528
The probability of a player weighing less than 250 pounds is 0.9772
The probability of a player weighing less than 250 pounds is 0.5000
