A hypothesis test is to be performed. State the null and alternative hypotheses.Last month the mean waiting time at a bank was 8.4 minutes. The manager has installed a new computer system and claims that people will no longer have to wait as long.
A. Null hypothesis: mean waiting time < 8.4 minutes
Alternative hypothesis: mean waiting time = 8.4 minutes
B. Null hypothesis: mean waiting time = 8.4 minutes
Alternative hypothesis: mean waiting time < 8.4 minutes
C. Null hypothesis: mean waiting time > 8.4 minutes
Alternative hypothesis: mean waiting time < 8.4 minutes
D. Null hypothesis: mean waiting time = 8.4 minutes
Alternative hypothesis: mean waiting time ? 8.4 minutes
Answer: B
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Find the sum.4 + 
+ 
+ 
+ . . .
A. 
B. 
C. 5
D. Does not exist
Determine whether the growth (or decay) is linear or exponential, and answer the associated question.The price of computer memory is decreasing at a rate of 10% per year. If a memory chip costs $79 today, what will it cost in two years?
A. Linear; $94.80 B. Exponential; $71.30 C. Linear; $63.20 D. Exponential; $63.99
Solve. y2 + 2y = 15
A. -3, -5 B. 5, -3 C. 3, 5 D. 3, -5
Factor by any method.81x2 - 4
A. (9x - 2)2 B. (81x + 1)(x - 4) C. (9x + 2)(9x - 2) D. (9x + 2)2