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Recent questions tagged statistics

The one which is the measure of the central tendency is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

The first of the two sample has 100 items with mean 15 and S.D= 3. If the whole group has 250 items with mean 15.6 and SD = $ \sqrt{13.44}$ the S.D of the second group is?

asked Jan 31, 2014 by thanvigandhi_1

1 answer

If $r_{xy}$ between two variates $x$ and $y$ is 0.6 $ cov (x,y)=4.8\: \sigma_x^2=9$ then $\sigma_y$ is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

$x$ and $y$ are two correlated variables with the same standard deviation and the correlation coefficient $r$ , the correlation coefficient between $x$ and $x+y$ is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

The two variates $x$ and $y$ are uncorrelated and have standard deviation $ \sigma_x$ and $ \sigma_y$ respectively, the correlation coefficient between $x+y\: and \: x-y$ is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

Lines of regression of $y$ on $x$ and $x$ on $y$ are respectively $y=ax+b$ and $x=\alpha y+ \beta$. If mean of $x$ and $y$ series is same then its value is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

Median of $ ^{2n}C_0, ^{2n}C_1, ^{2n}C_2, ^{2n}C_3...... ^{2n}C_n$ ( where n is even ) is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

The standard deviation of $n$ observations $x_1, x_2, ....x_n$ is 2. If $ \sum_{i=1}^n x_i=20$ and $ \sum_{i=1}^n x_i^2=100$ then $n$ is $i=1$

asked Jan 31, 2014 by thanvigandhi_1

1 answer

The standard deviation of the numbers 31, 32, 33, 46, 47 is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

If the variance 1,2,3,4,5....10 is $ \large\frac{99}{12}$ then the standard deviation of 3,6,9,12....30 is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

If the mean of $n$ observation $ 1^2, 2^2, 3^2.....n^2$ is $ \large\frac{46n}{11}$ then $n$ is equal to

asked Jan 30, 2014 by thanvigandhi_1

1 answer

The variance of $n$ natural number is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The correlation coefficient of two variables $x$ and $y$ is 0.8. The regression coefficient of $y$ on $x$ is 0.2 then the regression coefficient of $x$ and $y$ is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The correlation coefficient between $x$ and $y$ is from the following data is \[\] $ \Sigma x = 40\: \: \Sigma y=50\: \: \Sigma xy = 220\: \: \Sigma x^2=200\: \: \Sigma y^2 = 262\: \: n=10$

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The geometric mean of $ 2.262.....2^n$ is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The sum of absolute deviation about median is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The coefficient of correlation $r$ is independent of

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The variance of 6, 8, 10, 12, 14 is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If $b_{yx}=1.6$ and $b_{xy}=0.4$ and the angle between two regression lines is $ \theta$ then $ \tan \theta$ is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If 25% of item are less than 10 and 25% are more than 40, then coefficient of quartile deviation is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If the coefficient of variation of a distribution is 45% and the mean is 12 then its standard deviation is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The mean of the numbers $ a, b, 8, 5, 10$ is $6$ and the variance is $6.80$. Then which one of the following gives possible values of $a$ and $b$ ?

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If the mean deviation of the numbers $ 1, 1+d, 1+2d......1+100d$ from their mean is $255$, then the $d$ is equal to

asked Jan 29, 2014 by thanvigandhi_1

1 answer

For two data sets each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4 respectively. The variance of the combined data set is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

The standard deviation of -1, -2, -3, -4, -5, -6, -7 is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

The two lines of regression are $ x+2y-5=0$ and $ x+3y-8=0$. The coefficient of correlation between $x$ and $y$ is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

If $r_1$ and $r_2$ are regression coefficients of $y$ on $x$ and $x$ on $y$ respectively

asked Jan 28, 2014 by thanvigandhi_1

1 answer

The coefficient of correlation between $x$ and $y$ is $0.5$ and their covariance is $16$ and SD of $x$ is $4$ then SD of $y$ is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

For 12 pair of observation on $x$ and $y$ the $r$ calculated is $0.674$. The standard error is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

If in a moderately skewed distribution the value of mode and mean are $ 6 \lambda \: and \: 9 \lambda$ respectively, then value of median is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

Combined mean of two series $x_1\: and \: x_2$ when \[\] $x_1 = 210,\: x_2 = 150, \: n_1=50, \: n_2=100 $ is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

On thirteen consecutive days the number of persons booked for violating speed limit of 40 km / hr were as follows. \[ \] 58, 61, 68, 57, 62, 50, 55, 62, 53, 54, 51, 59, 52 \[\] The median number of speed violations per day is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

The 70th percentile is equal to

asked Jan 28, 2014 by thanvigandhi_1

1 answer

If the slopes of the line of regression of $y$ on $x$ and of $x$ on $y$ are $30^{\circ}$ and $60^{\circ}$ respectively. Then $ r(x,y)$ is

asked Jan 27, 2014 by thanvigandhi_1

1 answer

If the SD of X is $\sigma_X$ then SD of $\large\frac{aX-b}{c}$ ( where a,b,c are constants ) is:

asked Jan 27, 2014 by thanvigandhi_1

1 answer

The correlation between $x$ and $a-x$ is

asked Jan 27, 2014 by thanvigandhi_1

1 answer

For $a$ series the value of mean deviation is 15. The most likely value of its quartile deviation is

asked Jan 27, 2014 by thanvigandhi_1

1 answer

The median of the variables \[\] $x+4, x-\large\frac{7}{2},$$ x-\large\frac{5}{2},$$4 x-3, x-2$ \[\] $ x+\large\frac{1}{2}, x-\large\frac{1}{2}$$, x+5\: \: x > 0 $ is

asked Jan 27, 2014 by thanvigandhi_1

1 answer

A group of 10 items has arithmatic mean 6. If the arithmatic mean of 4 of these remaining item is 7.5 then the mean of the remaining item is

asked Jan 27, 2014 by thanvigandhi_1

1 answer

The measure which takes into account all the data item is

asked Jan 27, 2014 by thanvigandhi_1

1 answer

If in a frequency distribution, the mean and median are 21 and 22 respectively, then its mode is approximately

asked Jan 26, 2014 by thanvigandhi_1

1 answer

In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72 then what is the average of the girls ?

asked Jan 26, 2014 by thanvigandhi_1

1 answer

If variance of $ x_1, x_2,....x_n$ is $ \sigma^2$ then variance of $ ax_1, ax_2,.....ax_n ( a \neq 0)$ is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The quartile deviation for the data : \[\] x : 2 3 4 5 6 \[\] f : 3 4 8 4 1

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The quartile deviation of daily wages ( in Rs) of 7 person is 12, 7, 15, 10, 17, 17, 25 is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The mean age of a combined group of men and women is 30 years. If the mean of the age of men and women are respectively 32 and 27, then the percentage of women in the group is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

A group of 10 items has mean 6. If mean of 4 of these items is 7.5 the mean of remaining items is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The mean of a set of observation is $ \overline x$. If each observation is divided by $ a, a \neq 0$ and then is increased by 10, then mean of the new set is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The A.M of $n$ observation is $ \overline x$ . If the sum of $ n-5$ observations is $a$, then the mean of remaining 5 observation is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

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