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【单选题】
Tamara Hill, Fund Manager with Hillcrest Value Fund, manages a portfolio of 250 common stocks. Tamara is searching for a ‘low risk’ issue to add to the portfolio, i.e. one with a price variance less than that of the S&P 500 index. Moreover, she assumes an issue is not ‘low risk’ until demonstrated otherwise. Her staff reported that during the last nine quarters the price variance for the S&P 500 index (population 1) was 25, and for the last seven quarters the price variance for XYC common (population 2) was 8. Assume that stock prices are normally distributed in the population. Using a = 0.05, the appropriate decision is _______.A.
reject the null hypothesis s 1 2 = s 2 2
B.
eject the null hypothesis s 1 2 ¹ s 2 2
C.
do not reject the null hypothesis s 1 2 = s 2 2
D.
do not reject the null hypothesis s 1 2 ¹ s 2 2
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【简答题】 is said ______ the biggest health challenge to both men and women in that area over the past few years. A. that it is B. to be C. that it has been D. to have been
【多选题】以下关于Python中random模块的说法正确的是（_____）。
A.
设定相同的随机种子，每次调用随机函数生成的随机数相同。
B.
通过from random import *引入random库的全部函数。
C.
uniform(0,1)与uniform(0.0,1.0)的输出结果不同，前者输出随机整数，后者输出随机小数。
D.
randint(a,b)是生成一个[a,b]之间的整数，可能包括a和b。
【单选题】以下关于显示卡性能指标的叙述,错误的是( )
A.
GPU工作频率较高的显卡，应采用主动式散热
B.
显卡色彩位数越高，图形色彩越丰富
C.
刷新频率对液晶显示器不起作用
D.
显示模式设置为增强色16位时，每个像素可显示1677万种颜色
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