1. (TCO D) The national automobile repair franchise SuperSpeedyService claims it
ID: 2959654 • Letter: 1
Question
1. (TCO D) The national automobile repair franchise SuperSpeedyService claims it can complete a full 50,000 mile warrantee servicing in less than 5.5 hours. You are given the following data from a sample.
Sample size: 50
Population standard deviation: 1.2
Sample mean: 4.6
Formulate a hypothesis test to evaluate the claim. (Points: 10)
Ho: µ = 5.5; Ha: µ 5.5
Ho: µ 5.5; Ha: µ < 5.5
Ho: µ > 5.5; Ha: µ 5.5
Ho: µ 4.6; Ha: µ < 4.6
2. (TCO B) Assume that customers patronizing Pete's Gettem While They're Hot hot dog stand are binomially distributed by age (young = 18 or younger, and old = over 18). If ten people visit Pete's on a typical day, determine the following:
Binomial distribution
10
n
0.5
p
X
P(X)
cumulative probability
0
0.00098
0.00098
1
0.00977
0.01074
2
0.04395
0.05469
3
0.11719
0.17188
4
0.20508
0.37695
5
0.24609
0.62305
6
0.20508
0.82813
7
0.11719
0.94531
8
0.04395
0.98926
9
0.00977
0.99902
10
0.00098
1.00000
What is the probability that at least 6 will be young? (Points: 10)
83%
62%
21%
38%
10
n
0.5
p