problems on simultaneous equations with three variables

The standard deviation of the hemoglobin values (g/100ml) of 10 children is 1.7. Find the 99% confidence interval for the variance and standard deviation. Assume that the variable is normally distributed. => 1.26 < σ 2 < 14.75 ; 1.12 < σ < 3.84 or 1.1 <..

Which of the following statement(s) is/are true? I. A multiple regression equation with three independent variables x 1 , x 2 and x 3 and one dependent variable would have the form y′ = a + b 1 x 1 + b 2 x 2 + b 3 x 3 . II. A multipl..

A function is described by the equation f ( x ) = x + 1. The replacement set for the independent variable is {1, 3, 5, 7}. Which of the following is not contained in the corresponding set for the dependent variable? => 6 or 10 or 8 or 4..

The following data represent clotting times (mins) from three subjects treated in three different ways. The plasma samples were allocated randomly to the treatments and the analysis was repeated three times for each sample. Write the levels of (i) first, (ii) second variable and the degre..

A particle is said to move with variable acceleration if its velocity changes by unequal amounts in equal intervals of time. When a particle moves with variable acceleration, then its average acceleration measured for different time intervals is not the same. In the case of ..

random variable is a function which associates a real number to each outcome of a random experiment..

Consider an example. A person was asked to measure the thickness of a coin. He recorded the following readings: (i) 0.2 cm with ruler (ii) 0.23 cm with vernier (iii) 0.231 cm with micrometer The accuracy of thickness of the coin depended on the instrument used for measuring the thickness. Thus the..

A discrete variable can assume only integral values which can be counted. Number of pupils in a school, persons working in a factory are examples of discrete variables. A list of some important terms is given below. (i) ungrouped data (ii) tabulation of data (iii) range (iv) fr..

Normally metals donate electrons from their valence shell so as to form positively charged ions such that the charge on the ion is equal to its electropositive valenc..

Velocity, acceleration, density, area, volume, force, etc., have no constant value, but have dimension..