Practical Statistics Assessment for EDE 501

Students wanting to register for EDE 501 should complete and submit this assessment and wait for instructor permission to register.

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Complete this sentence:

Means, medians, and modes

Complete this sentence:

Means, medians, and modes provide information about sample variation are measures of central tendency can be calculated for variables at any measurement level tell us about the relationship between variables
Calculating the mean of a nominal variable provides meaningful information

Calculating the mean of a nominal variable provides meaningful information True False
A manufacturer of contact lenses is studying the curvature of the lenses it sells. In particular, the last 500 lenses sold had an average curvature of 0.5. The population is :

A manufacturer of contact lenses is studying the curvature of the lenses it sells. In particular, the last 500 lenses sold had an average curvature of 0.5. The population is : the 500 lenses 0.5 the lenses sold today all the lenses sold by the manufacturer none of the above
You calculate what percentage of students in a school have a cell phone. Is this

You calculate what percentage of students in a school have a cell phone. Is this a descriptive statistic? an inferential statistic? a structural equation? a mean?
What is the standard deviation of a sample?

What is the standard deviation of a sample? a measure of the amount of variation of a random variable expected around the mean the area around the mean in which 68% of sample values are found the square root of the variance all of the above
I am interested in the relationship between TWO CONTINUOUS variables , the statistical approach I will use is:

I am interested in the relationship between TWO CONTINUOUS variables , the statistical approach I will use is: Analysis of Variance correlation or simple linear regression canonical correlation factor analysis
If you want to compare men and women with regard to their mean depression score, you are most likely to use a

If you want to compare men and women with regard to their mean depression score, you are most likely to use a three-way Analysis of Variance independent samples T-test multiple regression Paired T-test
The difference between correlation and regression is that

The difference between correlation and regression is that one is for continuous and the other for categorical variables correlation normally involves only two variables; regression can involve multiple independent variables regression "predicts" the dependent variable using the independent variable; correlation is symmetrical both the 2nd and 3rd option above none of the above
How would you check whether a variable approaches a normal distribution?

How would you check whether a variable approaches a normal distribution? calculate mean and standard deviation calculate measures of skewness and kurtosis look at a histogram and see whether the values are distributed like a bell curve conduct a Shapiro-Wilk test all except the first option above are correct
Why do we want variables to be approximately normally distributed when we use them in statistical testing?

Why do we want variables to be approximately normally distributed when we use them in statistical testing? We don’t need to worry about distributions – we can just go ahead and run our analyses. Parametric tests rely on certain mathematical properties of the normal distribution and thus produce inaccurate results when the data distributions are not normal. Normal distributions are more likely to come out significant when we run a test on them. When the means of two normal distributions are the same, all the other parmeters are the same, as well.