[問題] 統計機率
1.
if a bag contains three white,two black,and four red balls and four balls
are drawn at random woth replacement what is the probablities that
the sample contains just one white ball given that it contains just
one red ball?
2.
平均看電視time 平均看書的時間
低於1小時 1~2小時 超過2小時
低於2小時 90人 85人 130人
高於2小時 655人 32人 8人
共1000人
(1)if the null hypothesis of no connection between time spent watching TV
and time spent reading storybooks is true, how many children watching
less than 2 hours of tv and readingno more than 2 hours of storybooks on
average can we expect?
(2)to test whether there is any relationahip between average time spent
watching tv and average reading storybooks the value of the measured
tset statistic is?
a.481.49 b.1368.06 c.-1259 d.1.61
(3) we want to test whether there is any relationship between average
time spent watching TV and average time spent reading storybooks
soppose the value of the test statistic was 164 (which is not correct
answer)and the critical value was 19 (which one is not correct answer)
then we could conclude that
a.there is connection between that
b.there is not connection between that
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