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If v is the variance and σ is the standard deviation, then

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Important Questions on Statistics

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Gamma Question Bank for Engineering Mathematics>Chapter 17 - Statistics>Assignment>Q 31
If the standard deviation(S.D.) of a set of observations is 8 and if each observation is divided by - 2, then S.D. of the new set of observations will be
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Gamma Question Bank for Engineering Mathematics>Chapter 17 - Statistics>Assignment>Q 32
If the coefficient of variation of two distributions are 50 and 60, and their arithmetic means are 30 and 25 respectively, then the difference of their standard deviation is
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Gamma Question Bank for Engineering Mathematics>Chapter 17 - Statistics>Assignment>Q 33
The mean and variance of 6 observations are 5 and 7 respectively. If the four observations are 1,3,4, 6 , then the remaining two observations are
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Gamma Question Bank for Engineering Mathematics>Chapter 17 - Statistics>Assignment>Q 34
If n=10, X¯=12 and Σxi2=1530, then the coefficient of variation is
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Gamma Question Bank for Engineering Mathematics>Chapter 17 - Statistics>Assignment>Q 35
Co-efficient of variation of two distributions are 25 and 30 and their standard deviations are 480 and 630 then sum of their arithmetic means are
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Gamma Question Bank for Engineering Mathematics>Chapter 17 - Statistics>Assignment>Q 36
The mean and standard deviation of 50 observations are 50 and 10. Later on its was decided to omit an observation which was incorrect by recorded as 99. Then the standard deviation of the remaining 49 observations are
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Gamma Question Bank for Engineering Mathematics>Chapter 17 - Statistics>Assignment>Q 37
If the co-efficient of variation of two distributions are 60% and 75% and their standard deviations are 45 and 40, then the ratio of their arithmetic means is
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Gamma Question Bank for Engineering Mathematics>Chapter 17 - Statistics>Assignment>Q 38
If two distributions have equal means, then