DATA1501 Practice Quiz

How do you feel about the final quiz?

• Not Confident

• Somewhat Confident

• Confident

• Very Confident

Match the following

• We accept the alternative hypothesis

• Level Of Significance

• We do not reject the null hypothesis

• When P-value<0.05

• We reject the null hypothesis

• p-value

• The probability that the null hypothesis is true.

• None of the above

• A measure of how confident you can be about rejecting the null hypothesis

• When P-value>0.05

Reorder the following steps for hypothesis testing

• Determine the appropriate test for your hypothesis

• Formulate the hypothesis

• Interpret the result and determine whether to reject the null hypothesis or not

• Perform the test

• Slope

• Y

• Predictor Variable

• Target Variable

• x

• Intercept

Tags

CCSS.8.SP.A.3

• Simple Linear Regression

• Multiple Linear Regression

• Binning Equation

• Residuals Equation

Tags

CCSS.HSS.ID.B.6A

What is true about residuals?

• Residuals are also known as error

• Residuals are the difference between predicted values of y and observed values of y.

• Residual=actual y value −calculated y

• Residual=actual y value + calculated y

Tags

CCSS.HSS.ID.B.6B

Match the following transformations to their variables

• Nominal

• Dummy Coding

• Ordinal

• Taking the square root

• Skewed to the left

• Raising to the power of 2

• Symmetrical

• Variable ranking

• Skewed to the right

• None of the above

Looking at the table, we would like to dummy code the variable colors.

We should create ​ ​ (a)   dummy variables.

By using Yellow as our ​benchmark or ​ (b)   category, Yellow will have the values of ​ (c)   across all variables.

• 2
• reference
• 0
• 1
• 3
• mark
• coded
• ranked
• 5

Using the table, we would like to dummy code the variable Colors. The easiest way to dummy code is using ​ (a)   .

The new variable Red_Dummy will have the following formula :

​ ​ (b)  

• IF statements
• =IF(B2="Red",1,0)
• Nested IF Statements
• Vlookup
• IFS
• ISDUMMY
• ​=IF(A2="red",1,0)
• ​IF(B2="red",1,0)
• =IF(B2="Red",1,IF(B2="Pink",2,3))

Car Garage is a discrete variable.

What is wrong with this graph?

• The bin width is not correct.

• The number of bins is not enough.

• The y-axis is not on the right scale.

• Nothing is wrong with this plot. Nothing is needed.

• The Axis titles are swapped. They need to be swapped back.

Tags

CCSS.6.SP.B.4

CCSS.HSS.ID.A.1