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. 29.75

B. 2.975

C. 42.5

D. 4.25

2 / 50

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

A. random

B. population

C. variable

D. sample

3 / 50

3. ____ is not an axiom of probability

A. \[P(\Omega)= 0\]

B. \[P(E)\leq 1\]

C. \[P(E)\leq 0\]

D. \[P(\Omega)= 1\]

4 / 50

4. 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. 0.8825

C. 0.8625

D. 0.937

5 / 50

The sum of deviations taken from mean is: _______________

6 / 50

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

7 / 50

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

A. 0.72

B. 5.72

C. 0.23

D. 2.27

8 / 50

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

9 / 50

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

10 / 50

10.

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

11 / 50

11.

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

12 / 50

12. 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. 25.5

C. 15.5

D. 19.5

13 / 50

13. Primary data is not collected through ___________

A. gazettes

B. surveys

C. observations

D. experiments

14 / 50

14.

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

15 / 50

15. _____ is the degree of peakness of a distribution

A. kurtosis

B. variation

C. symmetry

D. platykurtic

16 / 50

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

A. 15

B. 12

C. 14

D. 3

17 / 50

17.

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

18 / 50

18. 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 to measure the effect of external factors on its policies

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

19 / 50

19.

The arithmetic mean is highly affected by: ________

20 / 50

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

A. notation

B. combination

C. factorial

D. permutation

21 / 50

21.

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

22 / 50

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

A. independent

B. collectively exhaustive

C. dependent

D. mutually exclusive

23 / 50

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

A. 6

B. 6.5

C. 21

D. 17

24 / 50

24.

The population mean Î¼ is an example of a: _________

25 / 50

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

A. 1

B. 16

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

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

26 / 50

26. 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. 55

D. 36

27 / 50

27. 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

28 / 50

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

A. 7

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

C. 10

D. 9

29 / 50

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

A. minimum

B. standard deviation

C. maximum

D. zero

30 / 50

30.

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

31 / 50

31. 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. 2.90

B. 3.10

C. 3.90

D. 63%

32 / 50

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

A. 3rd

B. 2nd

C. 4th

D. 1st

33 / 50

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

A. Descriptive

B. Inductive

C. Frequency

D. Inferential

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. Find the number of students that offer all subjects

A. 6

B. 8

C. 11

D. 7

35 / 50

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

A. 9

B. 3

C. 18

D. 2.5

36 / 50

36. ____ is not an advantage of secondary data

A. They are the most appropriate for any statistical work

B. They can be used to establish trends for forecasting

C. They are available on a wide range of subjects

D. They are inexpensive to collect

37 / 50

37.

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

38 / 50

38.

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

39 / 50

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

A. skewness

B. modal

C. mean

D. median

40 / 50

40.

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

41 / 50

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

A. mutually exclusive

B. dependent

C. independent

D. mutually inclusive

42 / 50

42.

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

43 / 50

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

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

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

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

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

44 / 50

44.

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

45 / 50

45.

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

46 / 50

46.

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

47 / 50

47.

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

48 / 50

48.

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

49 / 50

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

A. 15.7

B. 5.75

C. 5.7

D. 9.7

50 / 50

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

A. 0.67

B. 0.48

C. 0.47

D. 0.57

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