s******a
发帖数: 184 | 1 An insurance company identified the 10 safest and 10 least-safe cities from
among the 200 cities in US, based on the mean number of years drivers went
between automobile accidents. It turns out that the cities on both lists
were all smaller than the 10 largest cities in those 200 cities. How to use
the sampling distribution model of the mean to explain this fact? |
s******a
发帖数: 184 | 2 自己顶一下.
from
use
【在 s******a 的大作中提到】
: An insurance company identified the 10 safest and 10 least-safe cities from
: among the 200 cities in US, based on the mean number of years drivers went
: between automobile accidents. It turns out that the cities on both lists
: were all smaller than the 10 largest cities in those 200 cities. How to use
: the sampling distribution model of the mean to explain this fact?
|
i**z
发帖数: 194 | 3 you need specified the definition of safe, a car accident or robbery? Most
of the time you need to use the counts, such as poisson or negative binomial.
from
use
【在 s******a 的大作中提到】
: An insurance company identified the 10 safest and 10 least-safe cities from
: among the 200 cities in US, based on the mean number of years drivers went
: between automobile accidents. It turns out that the cities on both lists
: were all smaller than the 10 largest cities in those 200 cities. How to use
: the sampling distribution model of the mean to explain this fact?
|
s******a
发帖数: 184 | 4 比如说，城市A， “the mean number of years drivers went between automobile
accidents“ 是10小时。
城市B， “the mean number of years drivers went between automobile accidents
“ 是20小时。
城市A 比城市B safe. |
j******4
发帖数: 6090 | 5 反了吧？
accidents
【在 s******a 的大作中提到】
: 比如说，城市A， “the mean number of years drivers went between automobile
: accidents“ 是10小时。
: 城市B， “the mean number of years drivers went between automobile accidents
: “ 是20小时。
: 城市A 比城市B safe.
|
c******r
发帖数: 300 | 6 What is the sampling scheme here, a fixed pct of the drivers in each city?
from
use
【在 s******a 的大作中提到】
: An insurance company identified the 10 safest and 10 least-safe cities from
: among the 200 cities in US, based on the mean number of years drivers went
: between automobile accidents. It turns out that the cities on both lists
: were all smaller than the 10 largest cities in those 200 cities. How to use
: the sampling distribution model of the mean to explain this fact?
|
a*******s
发帖数: 138 | 7 bigger cities/sample sizes -> smaller variance of the mean -> less likely to
see extremely values
from
use
【在 s******a 的大作中提到】
: An insurance company identified the 10 safest and 10 least-safe cities from
: among the 200 cities in US, based on the mean number of years drivers went
: between automobile accidents. It turns out that the cities on both lists
: were all smaller than the 10 largest cities in those 200 cities. How to use
: the sampling distribution model of the mean to explain this fact?
|
