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

2 / 50

2. 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. 1.0

D. 4.5

3 / 50

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

4 / 50

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

A. sample

B. random

C. population

D. variable

5 / 50

5. ____ is not an advantage of secondary data

A. They are inexpensive to collect

B. They can be used to establish trends for forecasting

C. They are available on a wide range of subjects

D. They are the most appropriate for any statistical work

6 / 50

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

7 / 50

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

8 / 50

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

A. 14

B. 3

C. 15

D. 12

9 / 50

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

A. mutually exclusive

B. independent

C. mutually inclusive

D. dependent

10 / 50

10.

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

11 / 50

11.

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

12 / 50

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

A. 15.7

B. 5.7

C. 5.75

D. 9.7

13 / 50

13.

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

14 / 50

14. ____ is not an axiom of probability

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

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

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

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

15 / 50

15.

The sum of deviations taken from mean is: _______________

16 / 50

16.

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

17 / 50

17. The following are examples of discrete random variables except

A. Binomial distribution

B. Poisson Distribution

C. Bernoulli distribution

D. Normal Distribution

18 / 50

18. 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. 20

B. 17

C. 11

D. 10

19 / 50

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

A. 56.51

B. 51.56

C. 13.73

D. 56.65

20 / 50

20. 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

21 / 50

21.

The suitable average for qualitative data is: ________

22 / 50

22.

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

23 / 50

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

A. uniquemodal

B. singlemodal

C. unimodal

D. unicmodal

24 / 50

24.

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

25 / 50

25.

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

26 / 50

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

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

B. Businesses use statistics to monitor the national economy

C. Government uses statistics only for census

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

27 / 50

27.

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

28 / 50

28.

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

29 / 50

29.

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

30 / 50

30.

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

31 / 50

31. 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. 11

B. 8

C. 6

D. 7

32 / 50

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

A. 0.47

B. 0.57

C. 0.67

D. 0.48

33 / 50

33.

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

34 / 50

34. 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

35 / 50

35. ______ is not a measure of dispersion

A. coefficient of variation

B. mean

C. variance

D. standard deviation

36 / 50

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

A. 2nd

B. 1st

C. 3rd

D. 4th

37 / 50

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

A. 5.72

B. 2.27

C. 0.72

D. 0.23

38 / 50

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

A. bell

B. octagon

C. oblong

D. cup

39 / 50

39.

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

40 / 50

40.

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

41 / 50

41. 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

42 / 50

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

A. 17

B. 21

C. 6.5

D. 6

43 / 50

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

A. distribute

B. tally

C. count the number of items

D. determine the number of classes

44 / 50

44. 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. 0.8625

B. 0.9

C. 0.8825

D. 0.937

45 / 50

45. _____ is the degree of peakness of a distribution

A. symmetry

B. platykurtic

C. variation

D. kurtosis

46 / 50

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

A. 1

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

C. 16

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

47 / 50

47.

The population mean Î¼ is an example of a: _________

48 / 50

48. 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

49 / 50

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

A. skewness

B. modal

C. median

D. mean

50 / 50

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

A. 4.33

B. 5.01

C. 4.21

D. 3.21

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