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 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. 15.5

C. 19.5

D. 25.5

2 / 50

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

3 / 50

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

4 / 50

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

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

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

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

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

5 / 50

The sum of deviations taken from mean is: _______________

6 / 50

6. 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. 37

B. 36

C. 60

D. 55

7 / 50

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

A. 10

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

C. 7

D. 9

8 / 50

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

9 / 50

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

A. 0.57

B. 0.48

C. 0.47

D. 0.67

10 / 50

10.

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

11 / 50

11. 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

12 / 50

12.

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

13 / 50

13. A frequency curve of a normal distribution is ____ shaped

A. oblong

B. octagon

C. cup

D. bell

14 / 50

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

A. dependent

B. independent

C. collectively exhaustive

D. mutually exclusive

15 / 50

15. 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. 7

B. 11

C. 6

D. 8

16 / 50

16.

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

17 / 50

17.

The arithmetic mean is highly affected by: ________

18 / 50

18. _____ is the degree of peakness of a distribution

A. variation

B. symmetry

C. kurtosis

D. platykurtic

19 / 50

19. ____ is not an advantage of secondary data

A. They can be used to establish trends for forecasting

B. They are inexpensive to collect

C. They are the most appropriate for any statistical work

D. They are available on a wide range of subjects

20 / 50

20.

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

21 / 50

21.

The suitable average for qualitative data is: ________

22 / 50

22.

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

23 / 50

23.

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

24 / 50

24. 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. 5.72

D. 0.23

25 / 50

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

A. 15

B. 3

C. 14

D. 12

26 / 50

26.

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

27 / 50

27.

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

28 / 50

28.

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

29 / 50

29. ______ is not a measure of dispersion

A. variance

B. standard deviation

C. mean

D. coefficient of variation

30 / 50

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

A. tally

B. distribute

C. count the number of items

D. determine the number of classes

31 / 50

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

A. 2.5

B. 18

C. 9

D. 3

32 / 50

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

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

B. Government uses statistics only for census

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

D. Businesses use statistics to monitor the national economy

33 / 50

33.

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

34 / 50

34.

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

35 / 50

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

A. 3.0

B. 4.0

C. 4.5

D. 1.0

36 / 50

36.

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

37 / 50

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

A. 3rd

B. 1st

C. 2nd

D. 4th

38 / 50

38. 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

39 / 50

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

A. sample

B. variable

C. population

D. random

40 / 50

40. 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. How many students offer only Biology

A. 11

B. 10

C. 17

D. 20

41 / 50

41.

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

42 / 50

42.

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

43 / 50

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

A. 21

B. 6.5

C. 6

D. 17

44 / 50

44.

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

45 / 50

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

A. mean

B. median

C. modal

D. skewness

46 / 50

46. Primary data is not collected through ___________

A. experiments

B. observations

C. surveys

D. gazettes

47 / 50

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

A. Micro-statistical information

B. Statistical information in business

C. Macro-statistical information

D. survey designs

48 / 50

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

A. 51.56

B. 56.65

C. 13.73

D. 56.51

49 / 50

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

A. singlemodal

B. unimodal

C. uniquemodal

D. unicmodal

50 / 50

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

A. 5.75

B. 15.7

C. 5.7

D. 9.7

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