mean=200, SD=30, n=100. z for x-bar=206?

Claim: population mean exactly 50. Choose H0.

Population SD=15, n=25. Standard error?

H0:mu=20 vs H1:mu>20 is:

Population mean=120, SD=24, n=64. Standard error?

Every observation increases by 20. What happens to the SD?

H0:p=.50, n=100, p-hat=.60. Find z.

Claim: mean battery life >10 hours. Choose H1.

Claim: fewer than 45% prefer Brand A. Choose H1.

Claim: mean waiting time