Regression and standard deviation

Question 1

Using the same equation above, predict how far will they go after 10 hours of driving?

Accepted Answer

617.51 kms

Question 2

The test results out of 100 pts are 80, 75, 80, 65, 60, 55, 45, 35, 20, 15, 20, 25 How many will fail if passing is 55?

Accepted Answer

6

Question 3

The linear regression equation is Y = -1.79 + 61.93X. Identify the slope of the equation

Accepted Answer

61.93

Question 4

For the regression equation Y = 5 + 10X; if X=6.3, what is Y?

Accepted Answer

68

Question 5

Things that do not follow a normal distribution

Accepted Answer

age, survival data on clinical trials

Question 6

What is the normal correlation between number of study hours and exam grades?

Accepted Answer

positive

Question 7

Find: Null hypothesis of above model on G. Age (independent) and weight (dependent variable).

Accepted Answer

There is no linear relationship between G.Age and Weight

Question 8

Which correlation coefficient shows the strongest relationship?

Accepted Answer

r= -0.987

Question 9

From the equation below where Y=distance in kms and X=driving hours, the slope can be interpreted as:

Accepted Answer

They drove at a speed of 61.93 kph

Question 10

Which is NOT true for linear regression?

Accepted Answer

predicts a binary variable result from continuous variables

Question 11

Test must be hard, so the scores were Standardized & only those with more than 1 standard dev below the mean will fail

Accepted Answer

3

Question 12

The normal distribution is referred to as the "bell curve" with 50% of values less than or greater than the mean

Accepted Answer

True

Question 13

A simple linear regression of weight in grams and Gestational Age (G.Age) in weeks has the following output:

Accepted Answer

3400

Question 14

Solve the mean for these test scores 80, 75, 80, 65, 60, 45, 35, 20, 15, 20, 25, 55

Accepted Answer

47.91

Question 15

How much of the variation of Y-axis is explained by X-axis if the correlation coefficient of the regression is 0.64?

Accepted Answer

41%

Questions 15