新用戶掃碼下載
掃碼下載APP
及時接收最新考試資訊及
備考信息
"quantity"exercise:Confidence level
學習是一個不斷積累的過程，每天學習一點，每天進步一點！為了幫助大家更高效地備考2021年CFA考試，正保會計網校每日為大家上新CFA習題供大家練習。讓網校與您一起高效備考2021年CFA考試，夢想成真！
Questions 1:
An increase in which of the following items will most likely result in a wider confidence interval for the population mean?
A、 Reliability factor
B 、Sample size
C 、Degrees of freedom
Questions 2:
The following ten observations are a sample drawn from an approximately normal population:
The sample standard deviation is closest to:
A 、17.56.
B、 19.59.
C、 18.58.
View answer resolution
【Answer to question 1】A
【analysis】
A is correct. An increase in the reliability factor (the degree of confidence) increases the width of the confidence interval. Increasing the sample size and increasing the degrees of freedom both shrink the confidence interval. B is incorrect. Increasing the sample size shrinks the confidence interval. C is incorrect. Increasing the degrees of freedom shrinks the confidence interval.
【Answer to question 2】B
【analysis】
B is correct.
The sample standard deviation is the (positive) square root of the sample variance:
A is incorrect. 17.56 is the sum of the absolute value of the deviations from mean divided by 9:
C is incorrect and is calculated by dividing the sum of squared deviations by 10 rather than 9: 3,453.60/10 = 18.58.
成功=時間+方法，自制力是這個等式的保障。世上無天才，高手都是來自刻苦的練習。而人們經常只看到“牛人”閃耀的成績，其成績背后無比寂寞的勤奮。小編相信，每天都在勤奮練習，即使是一點點的進步，大家一定可以成為人人稱贊的“牛人”。
學員討論（0）
推薦閱讀
新用戶掃碼下載
京公網安備 11010802044457號
