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

A. 2.975

B. 42.5

C. 4.25

D. 29.75

2 / 50

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

3 / 50

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

A. 9

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

C. 10

D. 7

4 / 50

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

5 / 50

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

A. 4.21

B. 3.21

C. 4.33

D. 5.01

6 / 50

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

7 / 50

7. Primary data is not collected through ___________

A. gazettes

B. surveys

C. observations

D. experiments

8 / 50

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

9 / 50

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

10 / 50

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

A. minimum

B. zero

C. standard deviation

D. maximum

11 / 50

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

A. variable

B. population

C. random

D. sample

12 / 50

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

A. oblong

B. bell

C. cup

D. octagon

13 / 50

13.

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

14 / 50

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

A. 5.72

B. 2.27

C. 0.23

D. 0.72

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. 6

C. 11

D. 8

16 / 50

16.

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

17 / 50

17. 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. 1.0

C. 3.0

D. 4.5

18 / 50

18.

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

19 / 50

19.

The population mean Î¼ is an example of a: _________

20 / 50

20.

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

21 / 50

21.

The arithmetic mean is highly affected by: ________

22 / 50

22.

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

23 / 50

23.

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

24 / 50

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

A. 12

B. 14

C. 3

D. 15

25 / 50

25.

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

26 / 50

26. An impossible event has the probability ______

A. 1

B. 0.25

C. 0

D. 0.5

27 / 50

27.

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

28 / 50

28. 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. 15.5

B. 10.5

C. 19.5

D. 25.5

29 / 50

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

A. skewness

B. median

C. modal

D. mean

30 / 50

30. ______ is not a measure of dispersion

A. variance

B. standard deviation

C. mean

D. coefficient of variation

31 / 50

31. 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. distribute

C. count the number of items

D. tally

32 / 50

32.

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

33 / 50

33.

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

34 / 50

34. 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

35 / 50

35.

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

36 / 50

36.

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

37 / 50

37. 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. 0.9

B. 0.937

C. 0.8825

D. 0.8625

38 / 50

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

A. unicmodal

B. unimodal

C. singlemodal

D. uniquemodal

39 / 50

39. The following are examples of discrete random variables except

A. Poisson Distribution

B. Binomial distribution

C. Normal Distribution

D. Bernoulli distribution

40 / 50

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

A. 1

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

C. 16

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

41 / 50

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

A. 15.7

B. 9.7

C. 5.75

D. 5.7

42 / 50

42.

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

43 / 50

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

A. independent

B. dependent

C. mutually inclusive

D. mutually exclusive

44 / 50

44.

The sum of deviations taken from mean is: _______________

45 / 50

45.

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

46 / 50

46. 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

47 / 50

47.

The suitable average for qualitative data is: ________

48 / 50

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

A. combination

B. permutation

C. factorial

D. notation

49 / 50

49. 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. 63%

B. 3.10

C. 3.90

D. 2.90

50 / 50

50.

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

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