Lecture7MidTerm

The median is the

• same as the mean

• second quartile

• third quartile

• none of the above

which of the following is affected by outliers, you can choose more than one answer

• Coefficient of variation

• Inter quartile range

• Standard deviation

• Standard error

observations considered outliers it it have values below

• Q1-1.5(IQR)

• Q1+1.5(IQR)

• Q3-1.5(IQR)

• Q3=+.5(IQR)

In simple linear regression if the independent variably (X) is categorical, this will be very informative model

• True

• False

if the relation between X and Y is as follwoing:

Y=a(logX)+b+e

Then a and b can't be estimated by linear regression

• False

• True

In multiple regression, if the independent variables (Xs) are highly correlated, this is called a problem of

• homoskedasticity

• heteroscedasticity

• multicollinearity

• outliers

the calculation from the confusion matrix

TP/(FN+TP)

is called

• Specificity

• F1

• Sensitivity

• Recall

what is the best hypothesis test in the follwoing situation

Three groups

I want to test that the variance of the groups are the same,

you can choose more than one answer

• Leven's test

• Barlett's test

• Shapiro Wilk's test

• none of the above

what is the best test in the following situation

three groups

I want to test whether the central tendency of them is the same or not

normal assumption met

The variance of the groups are significantly different

• Welch ANOVA

• Parametric ANOVA

• Kruskal Wallis test

• none of the above

What is the best test in the following condition

10 individuals watch an violent action movie then

after 1 hour the concentration of the individuals are measured,

then after two hours concentration measured then after 24 hours the concentration is measured

is the move affect the concentration

you can choose more than one answer

• One Way ANOVA

• Repeated measure ANOVA

• Paired t Test

• Friedman's test