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

A. dependent

B. independent

C. collectively exhaustive

D. mutually exclusive

2 / 50

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

3 / 50

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

4 / 50

4. 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. 55

B. 37

C. 60

D. 36

5 / 50

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

A. 15.7

B. 5.75

C. 5.7

D. 9.7

6 / 50

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

A. 9

B. 7

C. 10

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

7 / 50

7. An impossible event has the probability ______

A. 0

B. 0.25

C. 1

D. 0.5

8 / 50

The population mean Î¼ is an example of a: _________

9 / 50

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

A. 21

B. 17

C. 6

D. 6.5

10 / 50

10.

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

11 / 50

11. 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

12 / 50

12.

The arithmetic mean is highly affected by: ________

13 / 50

13. 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

14 / 50

14.

The sum of deviations taken from mean is: _______________

15 / 50

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

A. cup

B. octagon

C. oblong

D. bell

16 / 50

16.

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

17 / 50

17.

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

18 / 50

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

A. 0.67

B. 0.48

C. 0.47

D. 0.57

19 / 50

19.

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

20 / 50

20.

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

21 / 50

21. 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. 19.5

D. 15.5

22 / 50

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

A. uniquemodal

B. singlemodal

C. unicmodal

D. unimodal

23 / 50

23.

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

24 / 50

24. Primary data is not collected through ___________

A. gazettes

B. surveys

C. observations

D. experiments

25 / 50

25.

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

26 / 50

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

A. skewness

B. mean

C. modal

D. median

27 / 50

27. 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

28 / 50

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

A. 3.21

B. 4.33

C. 4.21

D. 5.01

29 / 50

29. 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. 3.0

D. 1.0

30 / 50

30.

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

31 / 50

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

A. Macro-statistical information

B. Statistical information in business

C. Micro-statistical information

D. survey designs

32 / 50

32. The following are examples of discrete random variables except

A. Poisson Distribution

B. Normal Distribution

C. Bernoulli distribution

D. Binomial distribution

33 / 50

33.

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

34 / 50

34.

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

35 / 50

35.

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

36 / 50

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

A. 15

B. 14

C. 12

D. 3

37 / 50

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

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

B. 1

C. 16

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

38 / 50

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

A. Inferential

B. Inductive

C. Frequency

D. Descriptive

39 / 50

39.

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

40 / 50

40.

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

41 / 50

41.

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

42 / 50

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

A. 1st

B. 4th

C. 3rd

D. 2nd

43 / 50

43.

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

44 / 50

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

A. Government uses statistics only for census

B. Businesses use statistics to monitor the national economy

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

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

45 / 50

45. 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

46 / 50

46. ____ is not an advantage of secondary data

A. They are the most appropriate for any statistical work

B. They can be used to establish trends for forecasting

C. They are inexpensive to collect

D. They are available on a wide range of subjects

47 / 50

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

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

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

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

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

48 / 50

48. 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. 63%

D. 3.10

49 / 50

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

A. 2.5

B. 18

C. 9

D. 3

50 / 50

50.

The suitable average for qualitative data is: ________

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