A random sample of 100 computer store customers spent an average of $75 at the store. Assuming the distribution is normal and the population standard deviation is $20, the 95% confidence interval for the population mean is closest to:

[单选题]My wallet is nowhere to be found. I ______in the store.A.must drop itB.must

[单选题]I ________ my wallet/watch when I was shopping in the store.A.must have dro

[单选题]The department store here has a good _____ because it never cheats its cust

[单选题]［A］ existence ［B］ store ［C］ reality ［D］ mind

[判断题] 赋值命令“STORE…TO…”与“＝”区别在于：“STORE…TO…”可以同时给多个变量赋值，而“＝”只能一次给一个变量赋值。A . 正确B . 错误

[试题]Thestorehadto___________anumberofclerksbecausesalesweredown.A．)layoutB)layoffC．)layasideD)laydown

[试题]下列程序的执行结果是______。STORE "" TO ASTORE.NULL.TO BSTORE O TO C? ISNULL(A),ISNULL(B),ISNULL(C),EMPTY(A),EMPTY(B),EMPTY?

[单选题]下列程序段的输出结果是 CLEAR STORE 10 TO A STORE 20 TO B SET UDFPARMS TO REFERENCE DO SWAP WITH A，(B) ?A，B PROCEDURE SWAP PARAMETERS Xl，X2 TEMP=X1 X1=X2 X2=TEMP ENDPROCA．10 20B．20 20C．20 10D．10 10

[单选题]在foxpro中，执行下列命令store ＂375＂to xstore x+＂12＂to yz=y-x 最后z的值为( )。A．12B．＂37512 375＂C．＂37512375＂D．＂12＂

[单选题]The cows broke into the store-house to feed themselves because______.A． they were too hungryB． they wanted to fight with the menC． they wanted to go on strikeD． they were so angry at their masters