STT205

Category: STT205

ATTENTION:

Kindly note that you will be presented with 50 questions randomized from the NOUN question bank. Make sure to take the quiz multiple times so you can get familiar with the questions and answers, as new questions are randomized in each attempt.

Good luck!

STT205

1 / 50

1. Which of these is closer to the mode for a skewed distribution?

A. modal

B. skewness

C. mean

D. median

2 / 50

2. Primary data is not collected through ___________

A. gazettes

B. experiments

C. observations

D. surveys

3 / 50

The sample mean X- is an example of a: ________________

4 / 50

4. A Poisson distribution is given by [p(x)=frac{0.72^{x} e^{-0.72}}{x!}]. Calculate the variance

A. 2.27

B. 5.72

C. 0.23

D. 0.72

5 / 50

5. The addition rule of probability is used for ___ events

A. dependent

B. mutually exclusive

C. independent

D. mutually inclusive

6 / 50

6. A characteristics that assumes different values for different entities is called __________________

A. random

B. population

C. variable

D. sample

7 / 50

7. Calculate 70% of the mean of the set of data in the table below

A. 29.75

B. 4.25

C. 42.5

D. 2.975

8 / 50

The sum of the squares of the deviations about mean divided by the number of observations is: ________

9 / 50

9. Calculate the standard deviation of the set of data in the table below

A. 13.73

B. 56.51

C. 51.56

D. 56.65

10 / 50

10. ____ statistics deals with methods of organizing, summarizing and presenting data in an informative way

A. Descriptive

B. Frequency

C. Inductive

D. Inferential

11 / 50

11. ______ is not a measure of dispersion

A. mean

B. variance

C. coefficient of variation

D. standard deviation

12 / 50

12. Which of the following is not a source of data?

A. Micro-statistical information

B. survey designs

C. Statistical information in business

D. Macro-statistical information

13 / 50

13. What is the sum of the medians of {3, 4, 4, 5, 6, 8, 8, 10} and {5, 5, 7, 9, 11, 12, 15, 18}

A. 15.5

B. 10.5

C. 25.5

D. 19.5

14 / 50

14. Any arrangement of r objects selected from a single group of n possible objects is called a ___________

A. permutation

B. factorial

C. notation

D. combination

15 / 50

15.

If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:_________

16 / 50

16.

If âˆ‘i=110Xi-50=100 then sample mean X- will be: ________

17 / 50

17. A student scored 45% in MTH101, 62% in MTH102, 30% in BUS103, and 70% in ACC101. Find his GPA if the respective credits are 3, 2, 2, 3

A. 2.90

B. 63%

C. 3.10

D. 3.90

18 / 50

18. What is the range of the set of data in the below

A. 6

B. 21

C. 6.5

D. 17

19 / 50

19.

The total of all the observations divided by the number of observations is called: ______

20 / 50

20.

The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is: ______

21 / 50

21.

Given X1=20 and X2=-20. The arithmetic mean will be: ________

22 / 50

22. The square root of the sum of deviations of a set of numbers from their arithmetic mean is ___________

A. minimum

B. maximum

C. standard deviation

D. zero

23 / 50

23. The difference between the harmonic mean of 2, 4, 8 and their geometric mean is __________

A. 0.47

B. 0.48

C. 0.57

D. 0.67

24 / 50

24. The sum of the frequencies of 16 and 18 in the table below is _____________

A. 15

B. 12

C. 3

D. 14

25 / 50

25.

When all the values in a series occur the equal number of times, then it is not possible to calculate the:__________

26 / 50

26. What is the relative cumulative frequency of 50 in the table below

A. \[\frac{7}{20}\]

B. 16

C. \[\frac{4}{5}\]

D. 1

27 / 50

27. If the mode of the distribution is X the [frac{X}{2}] in the table below is _____________

A. 3

B. 9

C. 18

D. 2.5

28 / 50

28. If at least one of the events of an experiment can occur, then they are said to be ________ events

A. dependent

B. mutually exclusive

C. collectively exhaustive

D. independent

29 / 50

29.

The midpoint of the values after they have been ordered from the smallest to the largest or the largest to the smallest is called:____

30 / 50

30.

The sum of deviations is zero when deviations are taken from:________

31 / 50

31.

The elimination of extreme scores at the top of the set has the effect of:_________

32 / 50

32. ____ is not an axiom of probability

A. \[P(E)\leq 1\]

B. \[P(\Omega)= 0\]

C. \[P(\Omega)= 1\]

D. \[P(E)\leq 0\]

33 / 50

33. 36. If 5, 8, 6 and 2 occur with frequencies 3, 2, 4 and 1 respectively, find the mean

A. 15.7

B. 5.75

C. 9.7

D. 5.7

34 / 50

34.

Any measure indicating the Centre of a set of data, arranged in an increasing or decreasing order of magnitude, is called a measure of: ______

35 / 50

35.

The sum of deviations taken from mean is: _______________

36 / 50

36.

The median is considered a robust measure because it is resistant to: ________

37 / 50

37. What is the cumulative frequency of 40 in table below?

A. 9

B. \[\frac{9}{20}\]

C. 10

D. 7

38 / 50

38.

 If the arithmetic mean of 20 values is 10, then sum of these 20 values is:_____

39 / 50

39.

When the values in a series are not of equal importance, we calculate the: _____________

40 / 50

40. The first step involved in constructing a group frequency distribution is to _________ (a) (b) count the number of items

A. determine the number of classes

B. count the number of items

C. tally

D. distribute

41 / 50

41.

 If the smallest observation in a data is decreased, the average which is not affected is: ____

42 / 50

42. There are 5 different items to be stocked in a store with 3 bins for the storage. What are the possible number of arrangements?

A. 60

B. 37

C. 55

D. 36

43 / 50

43. An impossible event has the probability ______

A. 0.5

B. 0

C. 1

D. 0.25

44 / 50

44. What is the probability of not getting a 1 in the toss of a single die?

A. \[\frac{5}{6}\]

B. \[\frac{1}{6}\]

C. \[\frac{2}{3}\]

D. \[\frac{3}{5}\]

45 / 50

45.

The arithmetic mean is highly affected by: ________

46 / 50

46. The square root of the sum of deviations of a set of numbers from their arithmetic mean is

A. maximum

B. standard deviation

C. zero

D. minimum

47 / 50

47.

 The first step in calculating the median of a discrete variable is to determine the: _______

48 / 50

48. The following are examples of discrete random variables except

A. Bernoulli distribution

B. Normal Distribution

C. Binomial distribution

D. Poisson Distribution

49 / 50

49. ____ is not an advantage of secondary data

A. They are the most appropriate for any statistical work

B. They are available on a wide range of subjects

C. They can be used to establish trends for forecasting

D. They are inexpensive to collect

50 / 50

50.

If a constant value is added to every observation of data, how would the value of the arithmetic mean behave? ________

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