Management · all questions

Business Statistics
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Q81

A coin is tossed 1000 times and head comes out 550 times. Can the deviation from expected value be due to fluctuations of simple sampling?

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Q82

Probability is the ratio of favourable events to the . . . . . . . . of equally likely events.

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Q83

Distributions which are not obtained by actual observations but are reduced mathematically under certain definite hypothesis or assumptions are called

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Q84

When coefficient of skewness is zero the distribution is

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Q85

Standard error of mean computed by

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Q86

Which of the following application does not belong to Poisson distribution

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Q87

Statements given below are related to analysis of variance. Identify the statements that are true.
Statement I The shape of 'F' distribution depends on the number of degrees of freedom in both the numerator and the denominator of the 'F' ratio.
Statement II In analysis of variance, sample sizes should be equal.
Statement III Analysis of variance may be used to test whether the means of more than two populations are equal.

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Q88

In a certain field of construction work, the wages are assumed to follow a normal distribution, with an average wage of Rs. 4 per day and a standard deviation of Rs. 0.50. If 20 workers received wages of more than Rs. 4.50 per day, what is the total number of workers?

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Q89

Attributes of the information includes

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Q90

If the proportion of defective in a bulk is 4%, find the probability of not more than 2 defectives in a sample of 10, it is known that e^-4 = 6703

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Q91

If r₁₂ = 0.9, r₁₃ = 0.75, r₂₃ = 0.7, find r_1.23

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Q92

If r_xy = 0.38, r_yz = 0.91 and r_xz = 0.62. Find the partial correlation between x and y with z as fixed variable.

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Q93

21 students took a exam. The sample variance is foundto be 80. The examiner claimsthat based on his past experience the true variance has been atleast 100. Does the sample result shows that the population variance significantly less than 100?
[Hint

x^{2} = \frac{( r - 1 ) s}{σ ^{2}} = \frac{( 21 - 1 ) \times 80}{100} = 16

The value of x² for 20 df 5% level of significance is 31.4. x² value is less than table value.]

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Q94

A random sample of 15 pairs of values of X and Y from a normal population gives a correlation coefficient of +0.6. Is the correlation in the population significant?

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Q95

Assumptions of Karl Pearson's co-efficient of correlation includes

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Q96

Both the regression coefficients cannot be

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Q97

Z-test is a

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Q98

Given

Sale price of product X	Sale price of product Y
1	33
4	27
7	23
9	17
15	15
17	14
25	11
30	6

The above values expressed to the

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Q99

If A and B are two mutually exclusive events, then probability that either of the two events will appear is the sum of their

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Q100

Suppose that in key punching of 80 column IBM cards, the mean number of mistakes per card is 0.3. What per cent of cards will have no mistake?

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