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1.

Find out the mid-value of the class 50-60 Assume that the class is exclusive.

Answer» Correct Answer - (50+60)/2 = 55
Discussion
2.

Differentiate between class-limites and class-interval.

Answer» Corresponding to a class interval, the class limits may be defined as the minimum value and the maximum value the class interval may contain. The minimum value is known as the lower class limit (LCL) and the maximum value is known as the upper class limit (UCL).
Discussion
3.

What is an open-end class? Why it should be avoided?

Answer» If, in a frequency distribution, the initial class interval is indeterminate at its beginning and/or the final class interval is indeterminate at its end, the distribution is said to possess “open ended” classes.Sometimes using open-ended classes is unavoidable, but they can cause problems with calculations and interpretation
Discussion
4.

The size of class interval is the distance between:A. Lower limit and higher limit of the same classB. Higher limit of the class and lower limit of the next classC. Lower limit of the class and lower limit of the next calssD. None of the above.

Answer» Correct Answer - C
C
Discussion
5.

Explain briefly the steps taken in construction of a frequency distribution.

Answer» Step 1: Sort the data in ascending order. The sorted data is presented below:
Step 2: Calculate the range of data.
Step 3: Decide on the number of intervals in the frequency distribution.
Step 4: Determine the intervals.
Step 5: Tally and count the observations under each interval.
Discussion
6.

Arrange the following into a frequency array in descending order: 35,43,65,35,65,41,43,54,59,60.

Answer» Ascending order- 35,41,43,54,59,60,65
Discussion
7.

Differentiate between a frequency array and a frequency distribution.

Answer» Frequency array refers to discrete series showing frequency corresponding to some discrete value, while frequency distribution refers to a series showing frequencies corresponding to different class-intervals.
Discussion
8.

State the steps in construction of frequency distribution.

Answer» Step 1: Sort the data in ascending order. The sorted data is presented below:
Step 2: Calculate the range of data.
Step 3: Decide on the number of intervals in the frequency distribution.
Step 4: Determine the intervals.
Step 5: Tally and count the observations under each interval.
Discussion
9.

Arrange the following into a array both in descending and ascending order: Marks obtained by students 40,59,80,92,33,75,63,74,81,0.

Answer» Ascending order- 0,33,40,59,63,74,75,80,81,90
Descending order- 90,81,80,75,74,63,59,40,33,0
Discussion
10.

An open end class is the class which lacks:A. Lower limitB. Higher limitC. Either lower limit or higher limitD. None of the above.

Answer» Correct Answer - C
C
Discussion
11.

How many classes a frequency distribution should have?A. Large numberB. Small numberC. Neither very large nor very small numberD. Not more than 10.

Answer» Correct Answer - C
C.There should be between 5 and 20 classes. The class width should be an odd number. This will guarantee that the class midpoints are integers instead of decimals.
Discussion