## AIOU PAST PAPER CODE 1430 SPRING BUSINESS MATHEMATICS AND STATISTICS-II

Aiou past paper for code 1430 business mathematics and statistics – II for the semester spring 2015. This course code 1430 business mathematics and statistics offered to B.com students. Search with following codes, aiou old paper code 1430, aiou past paper code 1430, aiou old paper code 1430 spring 2015, aiou past paper code 1430 spring 2015, code 1430 aiou old paper, spring 2015 aiou past paper code 1430.

Note: ATTEMPT FIVE QUESTIONS. QUESTION NO.1 IS COMPULSORY.

Q.I: Fill in the blanks.

i. The number of classes in a frequency distribution is obtained by dividing the range of variable by the ……………..

ii. The sum of square of deviations from ………………………….is least.

iii. If the values in a series are not of equal importance we compute……………………….

iv. When y1 is known, then confidence interval for /I is…………………..

v. ) is called of the test:

vi. The probability of accepting the true null hypothesis is called the level of vii. Statistical inference has two branches namely and testing of hypothesis. viii. The shape of [-distribution depends upon the

ix. A statement which is to be tested for possible rejection is called

x. A hypothesis is false and is accepted, is called error.

Q.2: (a)What is a statistical average? Name the important types of averages. Discuss the advantages and disadvantages of each. b) Calculate the mean and standard deviation for the following distribution of lengths of 200 metal bars.

x 30 31 32 33 34 35 36 37 38 39 f 4 8 23 35 62 44 18 4 1 I

Q.3: a)Define variance and standard deviation. Describe their properties:

b) For the following data, compute the inter-quartile range:

99 75 84 61 33 45 66 97 69 55 72 91 74 93 54 76 52 91 77 68

Q.4:

a) What is difference between a one-sided test and a two-sided est? When should each be used? b) Expensive test borings were made in an oil shale area to determine if the mean yield of oil per ton of shale rock is greater than 4.5 barrels. Five borings, made at randomly selected points in the area, indicated the following number of barrels per lot16.8, 5.4, 3.9, 4.9, 5.5. Suppose barrels per ton are normally distributed. Perform a test of hypothesis at the 5% level of significance.