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. ____ 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 available on a wide range of subjects

D. They are the most appropriate for any statistical work

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

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

4 / 50

4. _____ is the degree of peakness of a distribution

A. variation

B. symmetry

C. kurtosis

D. platykurtic

5 / 50

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

6 / 50

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

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

B. Businesses use statistics to monitor the national economy

C. Government uses statistics only for census

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

7 / 50

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

A. 14

B. 12

C. 3

D. 15

8 / 50

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

A. 5.7

B. 9.7

C. 15.7

D. 5.75

9 / 50

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

A. factorial

B. permutation

C. notation

D. combination

10 / 50

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

A. survey designs

B. Statistical information in business

C. Macro-statistical information

D. Micro-statistical information

11 / 50

11. 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

12 / 50

12.

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

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. 17

C. 20

D. 10

14 / 50

14.

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

15 / 50

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

A. 16

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

C. 1

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

16 / 50

16.

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

17 / 50

17. 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. 19.5

B. 15.5

C. 10.5

D. 25.5

18 / 50

18.

The population mean Î¼ is an example of a: _________

19 / 50

19.

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

20 / 50

20.

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

21 / 50

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

A. 56.65

B. 56.51

C. 51.56

D. 13.73

22 / 50

22.

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

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. 8

B. 6

C. 11

D. 7

24 / 50

24. 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. 3.90

C. 3.10

D. 63%

25 / 50

25. ____ is not an axiom of probability

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

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

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

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

26 / 50

26. Primary data is not collected through ___________

A. gazettes

B. experiments

C. observations

D. surveys

27 / 50

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

A. mean

B. modal

C. skewness

D. median

28 / 50

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

A. oblong

B. cup

C. octagon

D. bell

29 / 50

29.

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

30 / 50

30.

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

31 / 50

31.

The suitable average for qualitative data is: ________

32 / 50

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

A. 4.25

B. 29.75

C. 2.975

D. 42.5

33 / 50

33.

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

34 / 50

34.

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

35 / 50

35.

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

36 / 50

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

A. zero

B. standard deviation

C. maximum

D. minimum

37 / 50

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

A. 9

B. 18

C. 3

D. 2.5

38 / 50

38.

The sum of deviations taken from mean is: _______________

39 / 50

39. 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. 36

C. 55

D. 37

40 / 50

40.

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

41 / 50

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

A. 4.33

B. 5.01

C. 3.21

D. 4.21

42 / 50

42. 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

43 / 50

43. 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. 3.0

C. 4.5

D. 1.0

44 / 50

44.

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

45 / 50

45.

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

46 / 50

46.

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

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.

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

49 / 50

49. An impossible event has the probability ______

A. 0

B. 0.5

C. 1

D. 0.25

50 / 50

50.

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

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