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

A. 4.33

B. 5.01

C. 3.21

D. 4.21

2 / 50

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

3 / 50

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

4 / 50

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

A. standard deviation

B. zero

C. minimum

D. maximum

5 / 50

5. 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. 3.10

B. 3.90

C. 63%

D. 2.90

6 / 50

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

A. Frequency

B. Inductive

C. Inferential

D. Descriptive

7 / 50

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

8 / 50

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

A. 18

B. 2.5

C. 3

D. 9

9 / 50

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

A. 4.5

B. 4.0

C. 1.0

D. 3.0

10 / 50

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

A. 7

B. 9

C. 10

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

11 / 50

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

A. 14

B. 15

C. 12

D. 3

12 / 50

12.

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

13 / 50

13.

The population mean Î¼ is an example of a: _________

14 / 50

14. Primary data is not collected through ___________

A. surveys

B. experiments

C. gazettes

D. observations

15 / 50

15. The 75th percentile is the same as the ____ quartile

A. 2nd

B. 4th

C. 3rd

D. 1st

16 / 50

16. 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. 0.8625

B. 0.9

C. 0.8825

D. 0.937

17 / 50

17.

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

18 / 50

18.

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

19 / 50

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

A. Macro-statistical information

B. Micro-statistical information

C. survey designs

D. Statistical information in business

20 / 50

20. The following are examples of discrete random variables except

A. Binomial distribution

B. Poisson Distribution

C. Bernoulli distribution

D. Normal Distribution

21 / 50

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

A. count the number of items

B. tally

C. distribute

D. determine the number of classes

22 / 50

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

A. skewness

B. modal

C. median

D. mean

23 / 50

23. 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. 5.7

D. 9.7

24 / 50

24.

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

25 / 50

25. An impossible event has the probability ______

A. 0.25

B. 0.5

C. 1

D. 0

26 / 50

26.

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

27 / 50

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

A. 0.67

B. 0.47

C. 0.57

D. 0.48

28 / 50

28.

The mean of 10 observations is 10. All the observations are increased by 10%. The mean of increased observations will be: ______

29 / 50

29.

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

30 / 50

30.

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

31 / 50

31. _____ is the degree of peakness of a distribution

A. platykurtic

B. symmetry

C. variation

D. kurtosis

32 / 50

32. 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. 55

B. 36

C. 60

D. 37

33 / 50

33.

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

34 / 50

34.

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

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

A. singlemodal

B. unicmodal

C. uniquemodal

D. unimodal

37 / 50

37.

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

38 / 50

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

A. 51.56

B. 56.51

C. 56.65

D. 13.73

39 / 50

39.

The suitable average for qualitative data is: ________

40 / 50

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

A. 2.975

B. 29.75

C. 42.5

D. 4.25

41 / 50

41. ____ is not an axiom of probability

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

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

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

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

42 / 50

42. 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. 10.5

B. 19.5

C. 25.5

D. 15.5

43 / 50

43. ______ is not a measure of dispersion

A. variance

B. mean

C. coefficient of variation

D. standard deviation

44 / 50

44.

The arithmetic mean is highly affected by: ________

45 / 50

45.

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

46 / 50

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

A. mutually inclusive

B. dependent

C. mutually exclusive

D. independent

47 / 50

47.

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

48 / 50

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

A. sample

B. variable

C. population

D. random

49 / 50

49.

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

50 / 50

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

A. notation

B. factorial

C. combination

D. permutation

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