Question 23

Which of the following is true with regards to the concept of Margin of Error?

It is the value added to and subtracted from a point estimate in order to develop an interval estimate of a population parameter.

A measure of how close we expect the point estimate to be to the population parameter with the specified level of confidence.

None of these

All of these

Question 24

Which of the following is true regarding the concept of t-distribution?

It is a family of probability distributions.

It is used it develop the interval estimate of a population mean whenever the population standard deviation is unknown.

It is generally bell-shaped and symmetrical and tends to be flatter and broader than the normal distribution.

Same as z-distribution

None of these

All of these

Question 25

Which of the following describes the concept of Interval Estimate?

An estimate of a population parameter, an interval believed to contain the value of the parameter

It has the form of the point estimate +/- margin of error.

It has the values of the Lower and Upper limits.

None of these

All of these

Question 26

Ho is:

A statement about the value of a population parameter developed for the purpose of testing numerical evidence.

The hypothesis that is assumed to be tentatively true in the hypothesis testing procedure.

The proposition that is directly challenged by the evidence.

None of these

All of these

Question 27

The number of Degrees of Freedom is calculated as the sum of the sample size plus one:

True False

Question 28

Which of the following is true with regards to the concept of Hypothesis Testing?

It is a procedure based on sample evidence and probability theory.

It is the process of making a conjecture about the value of the population statistic.

It leads either to the acceptance or rejection of Ha.

None of these

All of these

Question 29

Which of the following is true about the concept of Students' distribution?

It is a family of distributions that is bell-shaped and symmetrical like the normal standard distribution.

The areas of tails are "fatter".

It is another name for t-distributions.

It was developed by Guinness Brewing Company

It is another name for z-distribution

Question 30

Sample Proportion is the fraction of items in a sample that have the attribute of interest:

True False