sample mean for grouped data

There are three methods to find mean for a frequency distribution. (i) Direct method: where x is the mid-interval f is the frequency M is the mean (ii) Short-cut method: where A = assumed mean d = x - A (iii) Step-deviation method: where i = class size We illu..

Module Two: Sampling and Experimentation - Overview of methods of data collection: Census Sample survey Experiment Observational study Planning and conducting surveys: Characteristics of a well-designed and well-conducted survey Populations, samples, and rand..

It is obtained by adding the raw scores and dividing the sum by the number of items. Suppose the raw scores are x 1 , x 2 , x 3 ,, x N then, mean where M = mean x = each score or item N = number of items = sigma, which means 'summation of ' Find the mean..

Which of the following is a property of sampling distribution? I. Mean of sampling distribution equals population mean. II. Sample mean comes closer to population mean than any other unbiased mean. III. As sample..

Find the mean for the data in the line plot. => 10 or 10.23 or 11.27 or 11..

What sampling method was used by a researcher who divided subjects into two groups according to gender and then selected members from each group for her sample? => cluster or stratified or random or systematic..

In the F test to compare means if the number of groups is k and the sum of sample sizes of the group is N , then what is the degrees of freedom? => d.f. N = N - k and d.f. D = k - 1. or d.f. N = k and d.f. D = i N - k . or d.f. N = k - 1 and d.f. D = N + k . ..

Find the mean for the data shown in the line plot. => 5 or 4 or Green or Cannot be determined..

The sum of 20 observations of a data is 440. Their mean is: => 44 or 420 or 22 or 20..

Select the incorrect statement(s). I. A sampling distribution of sample means is a distribution obtained by using the means computed from random samples of a specific size taken from a population. II. Sampling error is the difference betwe..