# STT205

## Category:STT205

0

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.
The sum of deviations taken from mean is: _______________


2 / 50

2. ______ is not a measure of dispersion

3 / 50

3. 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}

4 / 50

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

5 / 50

5.
The total of all the observations divided by the number of observations is called: ______



6 / 50

6.
The population mean Î¼ is an example of a: _________



7 / 50

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

8 / 50

8.
The median is considered a robust measure because it is resistant to: ________



9 / 50

9. ____ is not an axiom of probability

10 / 50

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

11 / 50

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

12 / 50

12.
The mean of 10 observations is 10. All the observations are increased by 10%. The mean of increased observations will be: ______


13 / 50

13.
Ten families have an average of 2 boys. How many boys do they have together?


14 / 50

14. 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

15 / 50

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

16 / 50

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

17 / 50

17.
The suitable average for qualitative data is: ________



18 / 50

18. The following are examples of discrete random variables except

19 / 50

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

20 / 50

20.
The arithmetic mean is highly affected by: ________



21 / 50

21.
Step deviation method or coding method is used for computation of the______



22 / 50

22.
Sum of absolute deviations of the values is least when deviations are taken from: ________



23 / 50

23.
If âˆ‘i=110Xi-50=100 then sample mean X- will be: ________



24 / 50

24.
The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is: ______


25 / 50

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

26 / 50

26. Primary data is not collected through ___________

27 / 50

27. ____ is not an advantage of secondary data

28 / 50

28.
When all the values in a series occur the equal number of times, then it is not possible to calculate the:__________



29 / 50

29.
The sum of the squares of the deviations about mean divided by the number of observations is: ________



30 / 50

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

31 / 50

31.
What effect will the elimination of extreme scores at the bottom of a data set have on the mean? ______



32 / 50

32.
The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from: ____________



33 / 50

33.
The sample mean X- is an example of a: ________________



34 / 50

34.
The midpoint of the values after they have been ordered from the smallest to the largest or the largest to the smallest is called:____



35 / 50

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

36 / 50

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

37 / 50

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

38 / 50

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

39 / 50

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

40 / 50

40.
 If the smallest observation in a data is decreased, the average which is not affected is: ____



41 / 50

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

42 / 50

42.
The sum of deviations is zero when deviations are taken from:________



43 / 50

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

44 / 50

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

45 / 50

45.
Given X1=20 and X2=-20. The arithmetic mean will be: ________


46 / 50

46.
If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:_________


47 / 50

47. An impossible event has the probability ______

48 / 50

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

49 / 50

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

50 / 50

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

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