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

2 / 50

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

A. maximum

B. minimum

C. standard deviation

D. zero

3 / 50

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

4 / 50

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

5 / 50

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

A. uniquemodal

B. unicmodal

C. unimodal

D. singlemodal

6 / 50

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

7 / 50

7. 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. 11

C. 20

D. 10

8 / 50

The population mean Î¼ is an example of a: _________

9 / 50

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

10 / 50

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

A. permutation

B. factorial

C. notation

D. combination

11 / 50

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

A. 13.73

B. 56.65

C. 56.51

D. 51.56

12 / 50

12.

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

13 / 50

13. 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. 63%

B. 2.90

C. 3.90

D. 3.10

14 / 50

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

A. 4.33

B. 3.21

C. 4.21

D. 5.01

15 / 50

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

A. 3

B. 2.5

C. 9

D. 18

16 / 50

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

A. 16

B. 1

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

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

17 / 50

17. 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. 6

C. 8

D. 7

18 / 50

18. 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. 9.7

D. 5.75

19 / 50

19. 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

20 / 50

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

A. 0.48

B. 0.57

C. 0.47

D. 0.67

21 / 50

21.

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

22 / 50

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

A. random

B. population

C. variable

D. sample

23 / 50

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

A. 1st

B. 4th

C. 3rd

D. 2nd

24 / 50

24. 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 only for census

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

25 / 50

25.

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

26 / 50

26. 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. 3.0

C. 1.0

D. 4.0

27 / 50

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

A. 29.75

B. 4.25

C. 2.975

D. 42.5

28 / 50

28.

The sum of deviations taken from mean is: _______________

29 / 50

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

A. survey designs

B. Micro-statistical information

C. Macro-statistical information

D. Statistical information in business

30 / 50

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

A. 15

B. 12

C. 3

D. 14

31 / 50

31.

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

32 / 50

32.

The suitable average for qualitative data is: ________

33 / 50

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

A. determine the number of classes

B. distribute

C. count the number of items

D. tally

34 / 50

34.

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

35 / 50

35.

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

36 / 50

36.

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

37 / 50

37. An impossible event has the probability ______

A. 0

B. 1

C. 0.25

D. 0.5

38 / 50

38.

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

39 / 50

39. Primary data is not collected through ___________

A. experiments

B. gazettes

C. observations

D. surveys

40 / 50

40. ______ is not a measure of dispersion

A. coefficient of variation

B. variance

C. standard deviation

D. mean

41 / 50

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

A. Inferential

B. Frequency

C. Inductive

D. Descriptive

42 / 50

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

A. cup

B. oblong

C. bell

D. octagon

43 / 50

43.

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

44 / 50

44.

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

45 / 50

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

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

B. 9

C. 7

D. 10

46 / 50

46.

The arithmetic mean is highly affected by: ________

47 / 50

47. ____ is not an axiom of probability

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

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

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

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

48 / 50

48.

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

49 / 50

49. The following are examples of discrete random variables except

A. Normal Distribution

B. Poisson Distribution

C. Binomial distribution

D. Bernoulli distribution

50 / 50

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

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

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

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

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

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