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

2 / 50

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

A. notation

B. permutation

C. combination

D. factorial

3 / 50

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

4 / 50

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

A. Inferential

B. Inductive

C. Frequency

D. Descriptive

5 / 50

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

6 / 50

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

7 / 50

7. Primary data is not collected through ___________

A. gazettes

B. surveys

C. experiments

D. observations

8 / 50

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

9 / 50

9. 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. 1.0

D. 3.0

10 / 50

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

A. maximum

B. zero

C. standard deviation

D. minimum

11 / 50

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

A. 1

B. 16

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

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

12 / 50

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

A. octagon

B. oblong

C. bell

D. cup

13 / 50

13.

The sum of deviations taken from mean is: _______________

14 / 50

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

A. 9.7

B. 5.7

C. 5.75

D. 15.7

15 / 50

15.

The suitable average for qualitative data is: ________

16 / 50

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

A. 2nd

B. 1st

C. 4th

D. 3rd

17 / 50

17.

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

18 / 50

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

A. 18

B. 3

C. 2.5

D. 9

19 / 50

19. An impossible event has the probability ______

A. 1

B. 0

C. 0.5

D. 0.25

20 / 50

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

A. 9

B. 10

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

D. 7

21 / 50

21.

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

22 / 50

22. 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

23 / 50

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

A. mean

B. modal

C. median

D. skewness

24 / 50

24.

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

25 / 50

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

A. 17

B. 6

C. 6.5

D. 21

26 / 50

26.

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

27 / 50

27. ____ is not an advantage of secondary data

A. They are available on a wide range of subjects

B. They are inexpensive to collect

C. They can be used to establish trends for forecasting

D. They are the most appropriate for any statistical work

28 / 50

28. 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. 0.8625

D. 0.8825

29 / 50

29. ______ is not a measure of dispersion

A. variance

B. mean

C. coefficient of variation

D. standard deviation

30 / 50

30. 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

31 / 50

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

A. distribute

B. tally

C. determine the number of classes

D. count the number of items

32 / 50

32.

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

33 / 50

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

A. 3

B. 14

C. 12

D. 15

34 / 50

34. 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. 3.90

B. 2.90

C. 3.10

D. 63%

35 / 50

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

A. Businesses use statistics to monitor the national economy

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

C. Government uses statistics only for census

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

36 / 50

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

A. collectively exhaustive

B. independent

C. dependent

D. mutually exclusive

37 / 50

37.

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

38 / 50

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

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

39 / 50

39.

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

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. Find the number of students that offer all subjects

A. 6

B. 7

C. 11

D. 8

41 / 50

41. _____ is the degree of peakness of a distribution

A. symmetry

B. kurtosis

C. platykurtic

D. variation

42 / 50

42.

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

43 / 50

43.

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

44 / 50

44.

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

45 / 50

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

A. 2.975

B. 29.75

C. 42.5

D. 4.25

46 / 50

46.

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

47 / 50

47.

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

48 / 50

48. 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

49 / 50

49. The following are examples of discrete random variables except

A. Normal Distribution

B. Binomial distribution

C. Poisson Distribution

D. Bernoulli distribution

50 / 50

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

A. standard deviation

B. zero

C. maximum

D. minimum

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