Explanation

• The sum of deviations from the regression line is zero.
• This is a fundamental property of linear regression, known as the "zero-sum property" or "error-sum property".

Explanation

• A Type-1 error, also known as an alpha error.
• It occurs when a statistical test rejects a null hypothesis that is actually true.
• This is a "false positive" result, where a significant effect is detected when none exists.

Explanation

The harmonic mean is the appropriate measure of central tendency to use when calculating the average speed of a journey.

This is because speed is a rate (distance per unit time), and the harmonic mean is used to average rates.

The formula for harmonic mean is: H = n / (∑(1/x))

where H is the harmonic mean, n is the number of values, and x is each value.

Explanation

• The variance of a Chi-square distribution with k degrees of freedom is 2k.
• This means that as the degrees of freedom (k) increase, the variance of the Chi-square distribution also increases.
• It indicating greater spread or dispersion in the data.

Explanation

• A sample statistic is a measure calculated from a smaller group of individuals (a sample) taken from a larger population.
• While a population parameter is a measure of the entire population.

Explanation

• The Central Limit Theorem (CLT) states that, given certain conditions, the sampling distribution of the sample mean (x̄) will be approximately normal, even if the underlying population distribution is not normal.
• This is true for large sample sizes (typically n > 30).

Explanation

The correct statement regarding the coefficient of correlation is: It is independent of both the scale and origin.

Explanation

RHETORIC means تقریر کا فن

Oratory means تقریر کا فن 

Explanation

What are they doing does not seem to be working جو کچھ کر رہے ہیں وہ کام کرتا نظر نہیں آتا۔

Explanation

Underneath is often used to say that something is under and covered by something else.

Underneath is generally used for boxes, sofas etc.