sampling distribution

Educational survey reports that the standard deviation in heights of all the girls of grade 10 was 6 cm. The heights (in cm) of a sample of 15 girls selected from different schools is shown. Find the chi-square test value and test the educational survey report at α = 0.05? [Assume t..

When should the t distribution be used to find a confidence interval for the mean? => When the sample size of population is greater than 30 and the standard deviation is known. or When the sample size of population is less than 30 and the standard deviation is known. o..

Which of the statement(s) is not the property of t distribution which differentiates it from the standard normal or z distribution? => The distribution shares the bell curve of the z , but reflects the variablility that is inherent with smaller sample sizes. ..

The Normal distribution: Properties of the Normal distribution Using tables of the Normal distribution The Normal distribution as a model for measurements Sampling distributions: Sampling distribution of a ..

Probability problems with finite sample spaces Conditional probability Discrete/continuous random variables Mean, variance of discrete random variable Standard distributions Mean, standard deviation of normally distributed random variable Central limit theorem ..

"Impure substances are commonly called mixtures." The constituents of a mixture may be elements, compounds, or both. These substances may be present in any proportion and exhibit their individual properties. Mixtures can be homogeneous or heterogeneous. A homogeneous mixture has a uniform compositi..

Take a beaker of water. Add a pinch of salt (sodium chloride) and stir. The water dissolves the salt and the salt spreads out throughout the water. Two samples of this solution taken from two different parts of the beaker will have the same composition. So, the solution is said to be homo..

>If A, B and C are mutually exclusive then Total Probability: P(A) = P(E 1 ) P(A|E 1 ) + P(E 2 ) P(A|E 2 )+ +P(E n ) P(A|E n ) Random variable: A real valued function 'X' defined on the sample space is called a random variable. Discrete random variable: A random variable which can assume ..