Module 4 - Week 10,11,12

Question 1

Independent: Gender
De pendant: Time between onset of symptoms and calling ambulance
Test: T-test

Answer

true

Question 2

Correlation and regression is used for

Accepted Answer

Continuous data

Answer

Both

Answer

Categorical data

Question 3

can correlation be used?

Answer

true

Question 4

remember

Answer

true

Question 5

Correlation coefficient is r

Answer

true

Question 6

Values
of
r
close
to
-­‐1
or
+1
indicate
a
strong linear association

Answer

true

Question 7

Values
of
r
close
to
zero
indicate
ligle
linear
associa2on
between
variables

Answer

true

Question 8

Which set of hypotheses

Accepted Answer

Ho = no linear relation
H1 = linear relation

Answer

Ho = linear relation
H1 = no linear relation

Question 9

true or false

Answer

true

Question 10

what are the variables

Accepted Answer

d: birth weight
i: smoking

Answer

i: birth weight
d: smoking

Question 11

What is the correlation

Accepted Answer

strong
p value significant
There is a linear association and smoking negatively affects birth weight

Answer

weak
p value not significant
There is no linear association and smoking does not negatively affect birth weight

Question 12

which variable on which axis?

Accepted Answer

i: x
d: y

Answer

i: y
d: x

Question 13

If association is not linear wat correlation coefficient is used

Accepted Answer

spearman's

Answer

pearson's

Question 14

All
correla2on
coefficients
require
the
associa2on
to be
monotonic

Answer

true

Question 15

wat is a confounding variable on the relationship between feet and vocab?

Accepted Answer

age

Answer

which primary school

Question 16

t or f

Answer

true

Question 17

true?

Answer

true

Question 18

t or f?

Answer

true

Question 19

If the slope (regression line) does not equal zero, the independant variable does not effect the dependant variable

Answer

true

Question 20

Positive B1 = positive relation

Answer

true

Question 21

t or f
value of 1 - age explains variation in systolic blood pressure
value of 0 - age does not explain variation in systolic blood pressure

Answer

true

Question 22

t or f

Answer

true

Question 23

t or f

Answer

true

Question 24

If observed values are close to the line, the error is small

Answer

true

Question 25

the residual should be zero

Answer

true

Question 26

t or f

Answer

true

Question 27

t or f: should not use this equation for someone outside the age range tested (30-95)

Answer

true

Question 28

What is B1?

Accepted Answer

How much Y changes for a one unit change in X

Accepted Answer

the regression coefficient (slope of the line)

Answer

the value of Y when X = 0

Question 29

What is Bo?

Accepted Answer

The y-intercept

Accepted Answer

the value of Y when X = 0

Answer

How much Y changes for a one unit change in X

Answer

the regression coefficient (slope of the line)

Question 30

Simple linear regression (SLR) is:

Accepted Answer

one dependent variable (outcome) and one independent variable

Answer

one dependent variable (outcome) and 2 or more independent variables

Question 31

What is multiple linear regression (MLR)?

Accepted Answer

one dependent variable (outcome) and 2 or more independent variables

Answer

one dependent variable (outcome) and one independent variable

Question 32

Which model would you select?

Accepted Answer

2

Answer

1

Answer

3

Question 33

Smaller variables of information criteria indicate a better model

Answer

true

Question 34

Multicollinearity = too big of a standard error

Answer

true

Question 35

True or false

Answer

true

Question 36

t

Answer

true

Question 37

What is sample size

Accepted Answer

Minimum number of people (measurements) needed to declare clinically important effects that are statistically significant

Answer

The probability of declaring an effect statistically significant when it is true

Question 38

What is power

Accepted Answer

The probability of declaring an effect statistically significant when it is true

Answer

Minimum number of people (measurements) needed to declare clinically important effects that are statistically significant

Question 39

Inadequate sample sizes are a waste of resources/time/money

Answer

true

Question 40

t or f

Answer

true

Module 4 - Week 10,11,12

Erstelle ein kostenloses Konto, um dieses Quiz zu beenden

Fragen in diesem Quiz (40)

Informationen

Feedback

Wie gefällt dir das neue Design?