Note: You will find the data in the excel file on following link: https://docs.google.com/spreadsheets/d/1Xve_DH7hACMjis
Posted: Mon Nov 15, 2021 9:53 am
Note: You will find the data in the excel file on following
link:
The question is:
A report examines the behavior of wild magpies in North America
(variable A). It is estimated that 6600000 of the type Pica
hudsonia (A = 0) and 24300000 of the type Pica nuttalli (A =
1).
A magpie should consider a human being who is approaching
himself as a threat. The hypothesis is therefore that the magpie
should use its left rather than its right eye more, when
approaching. A test person therefore had to approach magpies slowly
from behind, up to a distance of about three meters. The bird was
then followed at that distance, and meanwhile it was observed.
Meanwhile, the proportion of use of the right eye (B) of the magpie
was registered, as well as the number of warning cries (C) the
outcast. Parts of the result are reported in the table below.
Type of magpie (A)
Average (B)
Median (B)
Variance (B)
Min(B)
Max(B)
Cov(B,C)
Population share
0
44.7
44
73.9
3
61
6.3
21.4
1
44.8
44
79.1
5
62
10.1
79.6
A point estimate of the proportion of right - eyed people used
by magpies in North America is thus 44%, in contrast to the
previously known proportion of South American magpies which is
39%.
Finally, a regression model was used to explain the number of
warning cries:
Ci ~ ∝ +
βA Ai +
βB Bi + ϵi
The following estimates were, among others, obtained: ^
βA = - 0.091 and SE(^ βA) = 0.16
The question is:
Given the linear model, if B changes by 3 percentage points
and
A is constant, so how is C expected to change? Answer with a
decimal, and a comma before the decimal.
link:
The question is:
A report examines the behavior of wild magpies in North America
(variable A). It is estimated that 6600000 of the type Pica
hudsonia (A = 0) and 24300000 of the type Pica nuttalli (A =
1).
A magpie should consider a human being who is approaching
himself as a threat. The hypothesis is therefore that the magpie
should use its left rather than its right eye more, when
approaching. A test person therefore had to approach magpies slowly
from behind, up to a distance of about three meters. The bird was
then followed at that distance, and meanwhile it was observed.
Meanwhile, the proportion of use of the right eye (B) of the magpie
was registered, as well as the number of warning cries (C) the
outcast. Parts of the result are reported in the table below.
Type of magpie (A)
Average (B)
Median (B)
Variance (B)
Min(B)
Max(B)
Cov(B,C)
Population share
0
44.7
44
73.9
3
61
6.3
21.4
1
44.8
44
79.1
5
62
10.1
79.6
A point estimate of the proportion of right - eyed people used
by magpies in North America is thus 44%, in contrast to the
previously known proportion of South American magpies which is
39%.
Finally, a regression model was used to explain the number of
warning cries:
Ci ~ ∝ +
βA Ai +
βB Bi + ϵi
The following estimates were, among others, obtained: ^
βA = - 0.091 and SE(^ βA) = 0.16
The question is:
Given the linear model, if B changes by 3 percentage points
and
A is constant, so how is C expected to change? Answer with a
decimal, and a comma before the decimal.