# -*- coding: utf-8 -*-
"""
Created on Tue Jun 11 08:44:18 2019
@author: User
"""
'''
设一个总体，含有4个个体，即总容量为N=4，；4个个体分别为2、4、6、8。
求总体均值、方差
'''
import numpy as np
import pandas as pd
pop=np.array([2,4,6,8]) #pop为总体数据
print("\n 计算总体方差 pop.var(ddof=0)")
print(pop.var(ddof=0))
#print(pop.std())
print("\n 计算总体均值 pop.mean")
print(pop.mean())
print("===============================")
print("\n 以下是所有样本的均值数据")
miu=np.array([2,3,4,5,3,4,5,6,4,5,6,7,5,6,7,8])
print("\n 计算样本方差 miu.var(ddof=0)")
print(miu.var(ddof=0))
print("\n 计算样本均值 miu.mean")
print(miu.mean())运行：
计算总体方差 pop.var(ddof=0)
5.0
计算总体均值 pop.mean
5.0
===============================
以下是所有样本的均值数据
计算样本方差 miu.var(ddof=0)
2.5
计算样本均值 miu.mean
5.0