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

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

2 / 50

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

3 / 50

3. ____ is not an advantage of secondary data

A. They are inexpensive to collect

B. They can be used to establish trends for forecasting

C. They are the most appropriate for any statistical work

D. They are available on a wide range of subjects

4 / 50

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

A. 12

B. 14

C. 15

D. 3

5 / 50

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

6 / 50

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

7 / 50

The suitable average for qualitative data is: ________

8 / 50

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

A. 51.56

B. 13.73

C. 56.65

D. 56.51

9 / 50

9. What is the geometric mean of 3, 5, 6, and 7

A. 4.21

B. 4.33

C. 5.01

D. 3.21

10 / 50

10. Suppose there are 70 students in an examination with the students writing at least one of the subjects; Chemistry, Physics and Biology. Thirty(30) students offer Physics, 33 offer Chemistry and 40 offer biology, 10 students offer both Physics and Chemistry. Fourteen (14) of the students offer Physics and Biology, and 15 of them offer Biology and Chemistry. Find the number of students that offer all subjects

A. 8

B. 11

C. 6

D. 7

11 / 50

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

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

B. 10

C. 7

D. 9

12 / 50

12.

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

13 / 50

13.

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

14 / 50

14. 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. 36

B. 37

C. 60

D. 55

15 / 50

15. An impossible event has the probability ______

A. 0.5

B. 0.25

C. 1

D. 0

16 / 50

16.

The population mean Î¼ is an example of a: _________

17 / 50

17.

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

18 / 50

18.

The arithmetic mean is highly affected by: ________

19 / 50

19. In an examination the score obtained is weighted 3 times as much as a test score. If a student scored 85% in the examination with a test score of 90%, what is his mean score

A. 0.937

B. 0.9

C. 0.8825

D. 0.8625

20 / 50

20. 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. 19.5

B. 10.5

C. 25.5

D. 15.5

21 / 50

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

A. population

B. sample

C. variable

D. random

22 / 50

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

A. median

B. skewness

C. modal

D. mean

23 / 50

23.

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

24 / 50

24.

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

25 / 50

25.

What effect will the elimination of extreme scores at the bottom of a data set have on the mean? ______

26 / 50

26.

Sum of absolute deviations of the values is least when deviations are taken from: ________

27 / 50

27.

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

28 / 50

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

A. survey designs

B. Macro-statistical information

C. Micro-statistical information

D. Statistical information in business

29 / 50

29.

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

30 / 50

30. The empirical relationship between the mean and median is given by; mean �?? mode = x(mean �?? median) in the table below . Then x is _________________

A. 4.0

B. 3.0

C. 4.5

D. 1.0

31 / 50

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

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

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

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

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

32 / 50

32.

Step deviation method or coding method is used for computation of the______

33 / 50

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

A. 0.72

B. 0.23

C. 5.72

D. 2.27

34 / 50

34. ____ is not an axiom of probability

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

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

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

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

35 / 50

35.

The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from: ____________

36 / 50

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

A. independent

B. mutually exclusive

C. dependent

D. collectively exhaustive

37 / 50

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

A. notation

B. combination

C. factorial

D. permutation

38 / 50

38.

Scores that differ greatly from the measures of central tendency are called:_________

39 / 50

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

A. independent

B. mutually exclusive

C. dependent

D. mutually inclusive

40 / 50

40. The following are examples of discrete random variables except

A. Binomial distribution

B. Poisson Distribution

C. Normal Distribution

D. Bernoulli distribution

41 / 50

41. _____ is the degree of peakness of a distribution

A. kurtosis

B. platykurtic

C. symmetry

D. variation

42 / 50

42.

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

43 / 50

43. A set of data with only one mode is said to be __________

A. unimodal

B. unicmodal

C. singlemodal

D. uniquemodal

44 / 50

44. 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. 3.90

B. 63%

C. 2.90

D. 3.10

45 / 50

45.

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

46 / 50

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

A. distribute

B. count the number of items

C. tally

D. determine the number of classes

47 / 50

47.

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

48 / 50

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

A. 0.57

B. 0.48

C. 0.67

D. 0.47

49 / 50

49. Which of the following statement does not represent a role of statistics in the society?

A. Government uses statistics as a tool for collecting economic aggregates

B. Businesses use statistics to monitor the national economy

C. Government uses statistics to measure the effect of external factors on its policies

D. Government uses statistics only for census

50 / 50

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

A. 1

B. 16

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

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

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