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

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

2 / 50

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

A. 5.7

B. 5.75

C. 9.7

D. 15.7

3 / 50

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

4 / 50

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

A. 4.21

B. 3.21

C. 4.33

D. 5.01

5 / 50

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

6 / 50

6. _____ is the degree of peakness of a distribution

A. kurtosis

B. symmetry

C. platykurtic

D. variation

7 / 50

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

8 / 50

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

9 / 50

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

10 / 50

10. ____ is not an advantage of secondary data

A. They are available on a wide range of subjects

B. They are the most appropriate for any statistical work

C. They can be used to establish trends for forecasting

D. They are inexpensive to collect

11 / 50

11.

The sum of deviations taken from mean is: _______________

12 / 50

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

A. permutation

B. combination

C. notation

D. factorial

13 / 50

13. 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. 1.0

C. 4.0

D. 3.0

14 / 50

14. 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. Government uses statistics only for census

C. Businesses use statistics to monitor the national economy

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

15 / 50

15.

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

16 / 50

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

A. 9

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

C. 10

D. 7

17 / 50

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

A. 2nd

B. 4th

C. 3rd

D. 1st

18 / 50

18.

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

19 / 50

19. 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. 0.8625

C. 0.937

D. 0.8825

20 / 50

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

A. Micro-statistical information

B. Statistical information in business

C. Macro-statistical information

D. survey designs

21 / 50

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

A. median

B. skewness

C. modal

D. mean

22 / 50

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

A. 0.47

B. 0.67

C. 0.57

D. 0.48

23 / 50

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

A. unicmodal

B. unimodal

C. singlemodal

D. uniquemodal

24 / 50

24.

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

25 / 50

25. Primary data is not collected through ___________

A. experiments

B. observations

C. surveys

D. gazettes

26 / 50

26.

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

27 / 50

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

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

B. 16

C. 1

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

28 / 50

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

A. mutually inclusive

B. mutually exclusive

C. independent

D. dependent

29 / 50

29.

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

30 / 50

30.

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

31 / 50

31.

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

32 / 50

32.

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

33 / 50

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

A. count the number of items

B. distribute

C. tally

D. determine the number of classes

34 / 50

34.

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

35 / 50

35.

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

36 / 50

36. 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. 3.10

C. 63%

D. 2.90

37 / 50

37. 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. 17

B. 10

C. 20

D. 11

38 / 50

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

A. octagon

B. bell

C. cup

D. oblong

39 / 50

39.

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

40 / 50

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

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

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

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

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

41 / 50

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

A. 0.72

B. 2.27

C. 5.72

D. 0.23

42 / 50

42.

The population mean Î¼ is an example of a: _________

43 / 50

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

A. minimum

B. maximum

C. zero

D. standard deviation

44 / 50

44. An impossible event has the probability ______

A. 0.25

B. 0

C. 1

D. 0.5

45 / 50

45.

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

46 / 50

46. The following are examples of discrete random variables except

A. Bernoulli distribution

B. Normal Distribution

C. Poisson Distribution

D. Binomial distribution

47 / 50

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

A. 4.25

B. 42.5

C. 29.75

D. 2.975

48 / 50

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

A. 56.65

B. 51.56

C. 13.73

D. 56.51

49 / 50

49. ______ is not a measure of dispersion

A. standard deviation

B. mean

C. variance

D. coefficient of variation

50 / 50

50. 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. 10.5

D. 25.5

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