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## Tuesday, 25 August 2020

IGNOU BCA/MCA all semester new revised (first semester,second semester,third semester,fourth semester,fifth semester and six semester) term-end exam notes/study materials/important questions/books/blocks (June-December) free download

## Notes-1

1. Height of 20 students of a class was measured in cms. The following data represent it :
156 135 145 160 165
120 139 162 141 137
138 155 135 150 151
141 145 143 153 163
Perform the following tasks for the data given above.
(a) Enter the data in a spreadsheet package and create a frequency distribution in
the ranges less than 101, 101-110, 111-120, 121-130, 131-140, 141-150, 151-160,
161-170, more than 170. Use array formula for finding frequency distribution.
(b) Draw the histogram for the data.
(c) Find the mean and standard deviation of the data using spreadsheet formula.
(d) Find the minimum and maximum height using spreadsheet formula.

2. The heart rate (pulse rate) of 6 patients were recorded before and after taking a medicine.
The following table shows this data :

Pulse rate before medicine  97 75 85 104 110 89

Pulse rate after medicine  85 79 84 74 80 79

Using t-test with a significance level of 5% can you determine the new drug results in significant reduction in pulse rate. Clearly write Ho and H1 and explain your results.

## Notes-2

1. The electricity consumption of 20 different coolers of same rating were recorded. The following table shows this data :
Power consumption in one hour (number of units of electricity)
0.52 0.75 1.05 2.01 0.79
0.67 0.98 1.51 1.25 1.80
0.49 0.79 0.99 1.11 1.54
0.85 0.95 1.21 F31 1.41
Perform the following tasks for the data given above :
(a) Enter the data in a spreadsheet and create a frequency distribution. You must create suitable ranges for this distribution. Also you must use array formula for finding this distribution.
(b) Draw the histogram of the data.
(c) Find the relative frequency distribution for the frequency distribution obtained in part (a).
(d) Find the mean and standard deviation of the data using spreadsheet
formula.

2. A group of 10 students were given a course on English grammar and spellings. The following table shows their marks in two equivalent tests, one conducted before the course and the other conducted after the course :
Marks out of 100
Before the Course 25 75 45 65 35 80 50 66 71 20
After the Course 40 76 50 63 38 81 70 71 70 50
Using t-test with a significance level of 5%, can you say that the course has helped the students in enhancing their language capability ? Clearly write H o and Hi and explain youresult. Make suitable asumptions, if any.

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