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

2 / 50

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

A. 2.975

B. 42.5

C. 29.75

D. 4.25

3 / 50

The sum of deviations taken from mean is: _______________

4 / 50

4. _____ is the degree of peakness of a distribution

A. symmetry

B. platykurtic

C. variation

D. kurtosis

5 / 50

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

6 / 50

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

A. mean

B. median

C. modal

D. skewness

7 / 50

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

A. mutually exclusive

B. mutually inclusive

C. dependent

D. independent

8 / 50

8. ____ is not an advantage of secondary data

A. They are the most appropriate for any statistical work

B. They are inexpensive to collect

C. They are available on a wide range of subjects

D. They can be used to establish trends for forecasting

9 / 50

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

10 / 50

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

A. 14

B. 15

C. 3

D. 12

11 / 50

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

A. population

B. sample

C. variable

D. random

12 / 50

12.

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

13 / 50

13. 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

14 / 50

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

A. 3

B. 2.5

C. 9

D. 18

15 / 50

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

A. Government uses statistics only for census

B. Businesses use statistics to monitor the national economy

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

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

16 / 50

16. 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. 60

B. 37

C. 36

D. 55

17 / 50

17. The following are examples of discrete random variables except

A. Poisson Distribution

B. Bernoulli distribution

C. Normal Distribution

D. Binomial distribution

18 / 50

18.

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

19 / 50

19.

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

20 / 50

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

A. tally

B. count the number of items

C. distribute

D. determine the number of classes

21 / 50

21.

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

22 / 50

22.

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

23 / 50

23. 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

24 / 50

24.

The suitable average for qualitative data is: ________

25 / 50

25. 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. 0.8825

B. 0.937

C. 0.8625

D. 0.9

26 / 50

26. 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. 4.5

D. 3.0

27 / 50

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

A. 13.73

B. 56.65

C. 56.51

D. 51.56

28 / 50

28.

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

29 / 50

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

A. collectively exhaustive

B. dependent

C. mutually exclusive

D. independent

30 / 50

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

A. oblong

B. bell

C. cup

D. octagon

31 / 50

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

A. combination

B. notation

C. permutation

D. factorial

32 / 50

32.

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

33 / 50

33. 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. 19.5

C. 25.5

D. 10.5

34 / 50

34.

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

35 / 50

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

A. Descriptive

B. Inductive

C. Inferential

D. Frequency

36 / 50

36.

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

37 / 50

37.

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

38 / 50

38.

The population mean Î¼ is an example of a: _________

39 / 50

39.

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

40 / 50

40.

The arithmetic mean is highly affected by: ________

41 / 50

41.

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

42 / 50

42. Primary data is not collected through ___________

A. surveys

B. observations

C. experiments

D. gazettes

43 / 50

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

A. 2.27

B. 0.23

C. 0.72

D. 5.72

44 / 50

44.

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

45 / 50

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

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

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

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

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

46 / 50

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

A. 0.48

B. 0.67

C. 0.47

D. 0.57

47 / 50

47.

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

48 / 50

48. An impossible event has the probability ______

A. 0.25

B. 0.5

C. 1

D. 0

49 / 50

49.

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

50 / 50

50.

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

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