Question

1. Which of the following is not a characteristic of the normal probability distribution?

	a.	The distribution is symmetrical
	b.	The mean of the distribution can be negative, zero, or positive
	c.	The standard deviation must be 1
	d.	The mean, median, and the mode are equal

2. If , n = 12, and the slope equals 0.5, then the y-intercept of the least squares line is b₀ = 276.08.

True

False

3. The coefficient of correlation r is a number that indicates the direction and the strength of the linear relationship between the dependent variable y and the independent variable x.

True

False

4. The function that defines the probability distribution of a continuous random variable is a

	a.	uniform function.
	b.	normal function.
	c.	either normal of uniform depending on the situation.
	d.	probability density function.

Answer 1

Answers)

1) Which of the following is not a characteristic of the normal probability distribution

A) Options a) c) and d) are characteristic of the normal probability distribution ,except option B

2)If , n = 12, and the slope equals 0.5, then the y-intercept of the least squares line is b₀ = 276.08.

A) True

3)The coefficient of correlation r is a number that indicates the direction and the strength of the linear relationship between the dependent variable y and the independent variable x

A) False .Because the definition of coefficient of correlation 'r' is a number that measures strength and direction of a linear relationship between two variables.

4)The function that defines the probability distribution of a continuous random variable is a

A)The above definition represents the probability density function (Option -D).