問題詳情
5. An engineer designs an improved light bulb. The previous design had anaverage lifetime of 1200 hours. The new bulb has a lifetime of 1201 hours,using a sample of 2000 bulbs. Although the difference is quite small, the cffectis statistically significant. The explanation is
(A)that new designs typically have more variability than standard designs.
(B) that the sample size is very large.
(C)that the mean of 1200 is large.
(D)all of the above.
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增