ap statistics选择题不好意思,但还是有好多问题搞不懂1.One hundred people were interviewed and classified according to their attitude toward small cars and personality type.The results are shown in the table belowPersonality TypeType A

ap statistics选择题不好意思,但还是有好多问题搞不懂1.One hundred people were interviewed and classified according to their attitude toward small cars and personality type.The results are shown in the table belowPersonality TypeType A
ap statistics选择题
不好意思,但还是有好多问题搞不懂
1.One hundred people were interviewed and classified according to their attitude toward small cars and personality type.The results are shown in the table below
Personality Type
Type A Type B Total
Attitude Positive 25 12 37
toward Neutral 11 9 20
small cars Negative 24 19 43
Total 60 40 100
Which of the following is true?
the three attitude groups,the group with the neutral attitude has the highest proportion of type B personality types.不理解
2.同一个均值的两个不同样本量的分布,中间高的那个标准差比较大还是比较小?样本量大还是小?
3.A t-statistic was used to conduct a test of the null hypothesis H0:μ=0against the alternative Ha:μ≠0 The p-value was 0.056,A two-sided confidence interval for μ is to be constructed.Of the following ,which is the largest level of confidence interval will NOT contain 答案是93% confidence
如果是0.99%的话,(1-0.99)/2=0.005

ap statistics选择题不好意思,但还是有好多问题搞不懂1.One hundred people were interviewed and classified according to their attitude toward small cars and personality type.The results are shown in the table belowPersonality TypeType A
1. 这道题是2007的题吧,我有做过,老师上课还讲了,这道题有点难
B 选项绝对是对的,仔细读这条选项,它是指这个中立的小组选Type B在这中立的小组里面占的比例比其它组的要高 9/20 > 12/37 and 19/43
2.第二个题没看懂,最好用英文写出来,我对中文的术语不太熟悉
你是不是指2007年卷子的23题? 这两个图形都是sample,你只要记住一点,smaller sample size, more variablity (只是图形二） larger sample size, less variablity (这是图形一）
3. 当alpha = 0.05, we fail to reject Ho 那就说明confidence interval里有0
alpha 0.05 相对应的confidence interval 是95%
那现在只好选93%或者90%,问题里要Largest,那就是93%confidence
4. 方法E不行,你扔个骰子,万一全扔5和6,或者3和4的多一点,你每个组里的flies数量就不一样了
方法D 平均分配 而且是random select 每组20个