Question

QUESTION 1 [13 MARKS]

Write down only the letter corresponding to your choice next to the question number.

1.1. A random variable that can assume only a finite number of values is referred to as a

a) Infinite sequence

b) Finite sequence

c) Discrete random variable

d) Discrete probability function

e) All of the above

1.2 Which one of the following statements is incorrect?

a) A data set provides information about people, objects or other entities.

b) If the possible measurements of the values of a variable are numbers, then the variable is quantitative.

c) Whether your group has lung cancer or does not represents a qualitative variable.

d) A questionnaire containing questions about their sex and occupation is an ordinal variable.

e) The number of cigarettes smoked per day is a discrete variable.

1.3 A sample of a population is:

a) An experiment in the population

b) A subset of the population

c) A variable in the population

d) An outcome of the population

e) None of the above

1.4 Consider the frequency distribution of an exam given below.

Class Frequency Cumulative Frequency

50 ≤ x < 60 2

60 ≤ x < 70 5

70 ≤ x < 80 - 21

80 ≤ x < 90 17

90 ≤ x < 100 12 50

Which one of the following statements is incorrect?

a) The total number is 50.

b) The frequency of the class 70 ≤ x < 80 is zero.

c) The cumulative frequency of the class 80 ≤ x < 90 is 38.

d) The relative frequency of the class 50 ≤ x < 60 is 0.04.

e) Most of exam is represented by the class 80 ≤ x < 90.

1.5 Weight is a variable

a) Continuous

b) Discrete

c) Nominal

d) Ordinal

e) Secondary

1.6 The Statistics Department randomly selected 15 students and recorded their marks (in percentage) during the last examination. The data of the 15 students are as follows: 50 72 63 60 80 79 41 48 23 72 96 34 43 55 51 Which of the following statements is incorrect?

a) The range is 73

b) The median is 55

c) The mean is 57.8

d) Five of the 15 students failed the examination, that is, they obtained less than 50%

e) Three of the 15 students obtained more than 75% in exam.

1.7 Primary data is data collected for:

a) Primary school children

b) The purposes of a research being done

c) Ministry of home affairs and for safety reasons

d) Storage so that it can be used after 10 years

e) None of the above

1.8 Researchers do sampling because of all of the following reasons except

a) Reduce cost

b) Can be done in a shorter time frame

c) Sampling is interesting

d) Easy to manage due to manageable logistics requirements

e) There is many people involved

1.9 Which one of the following statements is not true about the mean?

a) It is the best measure of central tendency when data is not skewed.

b) In a symmetric distribution, the mean, the median and the mode are all equal.

c) It is not affected by extreme values or outliers.

d) It utilizes all values in its calculation.

e) The value of the mean times the number of observations equals the sum of all observations

1.10 The following information is collected from an application form for a car-loan to a certain bank.

(1)Marital status

(2) Total of monthly expenditures in Namibian dollars

(3) Number of jobs in the past ten years

(4) Gender of the applicant

(5) Erf number of the applicant

Which of the above variables are quantitative?

a) 1 and 2

b) 2 and 3

c) 3 and 4

d) 1, 2 and 5

e) 2 and 5

1.11. Which of the following is not a measure of central tendency in a statistical distribution?

a) Mean

b) Median

c) Mode

d) Standard deviation

e) All of the above are measures of central tendency

1.12. Which of the following calculations or measures is from a sample?

a) Statistics

b) Parameters

c) Populations

d) Simple random sampling

e) None of the above

1.13. A measure of the average value of a random variable is called an

a) Variance

b) Standard deviation

c) Expected value

d) Coefficient of variation

e) None of the alternative answers is correct.

Answer #1

QUESTION 1
Suppose a data set is skewed left. What is the most likely
relationship between the mean and the median?
a.
The mean is smaller than the median.
b.
The mean is larger than the median.
c.
The mean and median are not related to each other at all.
d.
The mean and median are essentially equal.
QUESTION 2
Which of the following CANNOT be obtained by a boxplot?
a.
mean
b.
IQR
c.
all of the above can...

1a.) The following grades were obtained on the Research Methods
course of students of the Urban Studies Department at Stanford
University (70, 90, 85, 70, 85, 60, 95, 50, 65, 70). There were 95
students in the class. Variance of the data set is:
a.144
b.214
c.184
d.None of the above
1b.) The following grades were obtained on the Research Methods
course of students of the Urban Studies Department at Stanford
University (70, 90, 85, 70, 85, 60, 95, 50,...

For the following questions write down corresponding correct
letter next to the question number only. Eg. 1.11 A
1.8 Sales revenue amounted to R167 000, and cost of sales
amounted to R100 000. Other operating income amounted to R13 000,
and other operating costs amounted to R25 000. Finance costs were
R10 000. The profit for the period was: a) R19 000 b) R32 000 c)
R45 000 d) R65 000 e) R89 000
1.9 The owner?s equity on 1...

answer all these questions please with the right question number
next to its letter
QUESTION 18
What is the appropriate number of classes for a frequency
distribution with 200 observations (n)?
A
5
B
6
C
7
D
8
QUESTION 19
For salaries of $152,000, $148,000, $25,000, $156,000 and
$151,000, the arithmetic mean would be an appropriate measure of
central tendency to use.
A)True
B) False
QUESTION 20
In a positively skewed distribution, the mode is greater than
the median....

John and Mary visited 29 randomly selected Starbucks locations
and recorded the number of cappuccinos sold at each coffee shop on
April 1st. They summarized the data in the following frequency
distribution table: (Variable ,Frequency) (0, 2 ) (1, 5) ( 2, 8)
(3, 10) (4, 4) (5, 2)
a. For this scenario, identify the following: • Variable •
Individual (Subject) • Sample • What percentage of Starbucks
locations sold at least 3 cappuccinos?
b. Calculate the sample mean. Note:...

Subject: Statistics
Please show complete work for the multiple-choice
questions below
1. Given that a collection of scores on a quiz
leads to a mean of 40, a median of
38, and a mode of 36. If we added l0 points to each score what
would be the
new median?
a. 38
b. 40
c. 48
d. 50
2. When an odd number of ungrouped scores are
arranged according to
magnitude, the median is the:
a. score with the greatest...

Which of the following variables are best thought of as
continuous, which discrete? Indicate your choice for each by
checking the appropriate column.
Variable Discrete Continuous
(a) The number of personal telephone calls made tomorrow at Bingley
Corporation
(b) The number of defective compact discs in a batch of 500
discs
(c) The time that a student in Calculus 101 takes to complete a
midterm exam
(d) The actual length of a roll of plastic wrap advertised to be 30...

Using the given data set to answer the following questions80 60
100 40 40 50 80 90 100 60 10 80 45 60 30 80 30 90 100 60 50 75
a. find Mean, Median, Mode, Standard Deviation, and
Variance:
b. find First quartile and Third Quartile
c. Find the number which represents the 33th percentile.
d. find the percentile of 45
e. find the range and midrange
f. construct a box-plot
g. Construct a frequency distribution with 5 classes....

QUESTION 1
Sensitivity of the measurements of exposure can be classified as
a measure of:
A. Generalizability
B. Validity
C. Precision
D. Causality
QUESTION 2
Two screening tests are available for Disease X. Test A has a
sensitivity of 70% and a specificity of 95%; Test B has a
sensitivity of 80% and a specificity of 90%. Which test produces
the greater percentage of false negatives?
A. Test A
B. Test B
C. Both produce same percentage.
D. It cannot...

The volume of milk in a jug is a variable which
is:
[A]
qualitative [B]
quantitative
discrete [C] quantitative
continuous
Which of the following is not a measure of variability?
[A]
variance
[B]
range
[C]
median
[D] standard deviation
The upper quartile of a large data set is 52. What percent of
the observations are greater than 52?
[A] 63%
[B] 37%
[C] 75%
[D] 25%
Scores on the final exam taken by 1200 students have...

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