LER593_Exam 1 Review_Fall 2023

The uniform, normal, and exponential distributions are

When data are negatively skewed, the mean will usually be

A population has μ = 50 and σ = 5. If every score is multiplied by 2, then what are the new values for the mean and SD?

10 out of 17 students in our class prefer dogs. I conclude 10/17 of ALL UIUC students prefer dogs. This is an example of

For any continuous random variable, the probability that the random variable takes on exactly a specific value is

Z-transformation can transform any distribution to a normal distribution.

The best way to draw cause-and-effect relationships between two variables is via experimental method.

The mean age of 190 students at UIUC is 22. Based on this info, we conclude that the mean age of all students at UIUC

Under a normal distribution, approximately how many values are within the +1/-1 SD from the mean?

The center of a normal distribution …

The ordinal scale of measurement has the properties of the

Social security numbers consist of numeric values. Therefore, social security is an example of

The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals

Larger values of SD results in a normal distribution curve to be wider and flatter

The total area under a continuous probability distribution curve always equals 1

Exponential probability distribution is a type of discrete probability distribution.

Income is an example of a variable that uses the

In a standard normal distribution, the probability that Z is greater than zero is

A reliable scale is always valid

1. The symbol σ is used to represent

The shape of a normal distribution is determined by its mean and standard deviation only.

The distribution of students' scores on a VERY easy exam is likely to be positively skewed

The numerical value of the standard deviation can never be

For any normal distribution, its mean, mode, and median have the exactly same value.

The mean for a sample of 5 scores is 8. I add another one with a score of 20. What is the mean for the new sample(n=6)？

Which of the following is NOT a characteristic of the normal probability distribution?

Sometimes HR researchers use multiple survey items to measure one variable (e.g., jot satisfaction) to increase the

In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of the

The measure of variability that is influenced most by extreme values is

1. Population mean is an example of inferential statistics.