Mohammed Qadoury Abed

13 Questions 2 Answers 0 Followers

Questions related from Mohammed Qadoury Abed

When should I use the chi-square test and when should I use the Student’s t-test and why!?

t is used to compare two variables only and is parametric As for the chi-square, it is for comparison between groups and is non-parametric. Is this true?

23 December 2023 9,594 6 View

Why does random error follow a normal distribution?

Random error is the accumulation of an infinite number of variables, and because the sum of an infinite number of variables follows a normal distribution according to the central limit theory, the...

21 September 2023 7,766 0 View

Why are the estimated parameters biased with the presence of the multicollinearity problem...in all statistical estimation methods?

The most common problem researchers face in formulating regression models is the presence of multicollinearity

21 September 2023 2,142 0 View

Most questionnaires do not follow a normal distribution. Is this true?

Most questionnaires follow a normal distribution if they are collected properly and an appropriate normal distribution test is used. Determine the goal of whether the questionnaire has a normal...

21 September 2023 9,550 0 View

If the data have shown to be normal, except one or two, the selection of adopting parametric or non parametric is the question?

I think we use nonparametricity and determining the sample size is important

18 September 2023 4,238 0 View

I have qualitative research and personal interviews were used to analyze the data. Can equation modeling be applied to this research?

I cannot apply modeling as it requires quantitative research, not qualitative research, as it requires a large sample. Is this true?

18 September 2023 8,244 1 View

In your opinion, what are the criteria that companies adopt to appoint employees and managers specialized in statistics and data analysis?

He has sufficient knowledge of ready-made statistical applications and data analysis methods

18 September 2023 2,761 2 View

What is the role of statisticians in companies and institutions? Is their interest limited to providing advice, planning and consultation?

Statisticians have a major role in the work of companies and institutions of various types and specializations

16 September 2023 4,663 0 View

What is the maximum number of dummy variables that can be used in regression analysis?

A dummy variable is a variable that takes specific numbers. Values for different attributes. Full rank.

15 September 2023 9,264 4 View

Can the standard deviation be higher than the arithmetic mean value?

If the value of the standard deviation exceeds half the value of the arithmetic mean, this means that the data is not homogeneous and data conversion must be done or the outliers should be...

13 September 2023 1,942 9 View

What are the statistical measures used to compare nonparametric methods of interaction testing in factorial experiments?

Do you use the relative efficiency and also the power of the test

12 August 2023 4,842 0 View

Can the parameter of the Moving Average model be assumed to be Random Coefficients, and how do we estimate the parameter in this case?

The original model parameter is nonlinear and can be estimated by either nonlinear least squares, Newton-Raphson method, or iterative process method.

03 August 2023 142 0 View

How are orthogonal contrasts selected in case of unequal sample sizes?

I did not find a mathematical formula to find or through which we can determine or choose the correspondences in the case of unequal sample sizes

01 January 1970 9,403 2 View