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

The population mean Î¼ is an example of a: _________

2 / 50

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

3 / 50

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

4 / 50

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

5 / 50

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

A. 4th

B. 2nd

C. 1st

D. 3rd

6 / 50

6. 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. 63%

C. 3.90

D. 2.90

7 / 50

7. _____ is the degree of peakness of a distribution

A. symmetry

B. platykurtic

C. kurtosis

D. variation

8 / 50

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

A. skewness

B. median

C. mean

D. modal

9 / 50

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

10 / 50

10.

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

11 / 50

11. Primary data is not collected through ___________

A. gazettes

B. observations

C. surveys

D. experiments

12 / 50

12.

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

13 / 50

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

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

B. 16

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

D. 1

14 / 50

14. The following are examples of discrete random variables except

A. Bernoulli distribution

B. Poisson Distribution

C. Binomial distribution

D. Normal Distribution

15 / 50

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

A. Frequency

B. Descriptive

C. Inferential

D. Inductive

16 / 50

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

A. maximum

B. standard deviation

C. minimum

D. zero

17 / 50

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

A. 4.25

B. 2.975

C. 29.75

D. 42.5

18 / 50

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

A. 2.5

B. 9

C. 3

D. 18

19 / 50

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

A. unimodal

B. singlemodal

C. uniquemodal

D. unicmodal

20 / 50

20. 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. tally

C. count the number of items

D. distribute

21 / 50

21.

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

22 / 50

22. 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

23 / 50

23. ______ is not a measure of dispersion

A. standard deviation

B. coefficient of variation

C. mean

D. variance

24 / 50

24.

The sum of deviations taken from mean is: _______________

25 / 50

25.

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

26 / 50

26. ____ is not an advantage of secondary data

A. They are inexpensive to collect

B. They are the most appropriate for any statistical work

C. They are available on a wide range of subjects

D. They can be used to establish trends for forecasting

27 / 50

27.

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

28 / 50

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

A. 21

B. 6

C. 6.5

D. 17

29 / 50

29.

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

30 / 50

30. 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. independent

D. collectively exhaustive

31 / 50

31.

The arithmetic mean is highly affected by: ________

32 / 50

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

A. independent

B. mutually inclusive

C. mutually exclusive

D. dependent

33 / 50

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

A. 2.27

B. 0.72

C. 0.23

D. 5.72

34 / 50

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

A. 0.47

B. 0.67

C. 0.48

D. 0.57

35 / 50

35.

The suitable average for qualitative data is: ________

36 / 50

36. 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. 55

C. 60

D. 37

37 / 50

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

A. 3

B. 15

C. 14

D. 12

38 / 50

38.

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

39 / 50

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

A. sample

B. random

C. variable

D. population

40 / 50

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

A. permutation

B. factorial

C. combination

D. notation

41 / 50

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

A. survey designs

B. Micro-statistical information

C. Macro-statistical information

D. Statistical information in business

42 / 50

42.

The frequency distribution of the hourly wage rate of 60 employees of a paper mill is as follows: The mean wage rate is:N______

43 / 50

43.

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

44 / 50

44.

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

45 / 50

45. 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. 11

B. 6

C. 7

D. 8

46 / 50

46.

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

47 / 50

47.

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

48 / 50

48.

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

49 / 50

49. 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. 3.0

D. 1.0

50 / 50

50.

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

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