Multiple choices 40/50
Answer (Choose 1 answer)
The amount of time required to reach a customer service representative has a huge impact on customer satisfaction. See picture for the Excel output at significance level 0.05 from a study whether there is evidence of a difference in the mean amounts of time required to reach a customer service representative between two hotels. Assume that the population variances in the amount of time for the two hotels are not equal.
Observations
Hotel 1
2.214
2.951657
20
0
Mean
Variance
Hypothesized Mean
Difference
df
t Stat
State the null and alternative hypotheses for testing if there is evidence of a difference in the variabilities of the amount of time required to reach a customer service representative between the two hotels.
A. (iii)
B. (i)
C. (ii)
P(T<=t) one-tail t Critical one-tail
P(T<=t) two-tail
t Critical two-tail
Hotel 2
2.0115
3.57855
20
38
0.354386
0.362504
1.685953
0.725009
2.024394
Next
(i)Ho: 07-20 versus H_{1}:\sigma_{I}^{2}-\sigma_{II}^{2}<0
D. (iv)
t-Test: Two-Sample Assuming Unequal Variances
(ii)H_{0}:\sigma_{I}^{2}-\sigma_{II}^{2}\le0 versus H_{1}:\sigma_{I}^{2}-\sigma_{II}^{2}>0
(iii) Ho: - = 0 versus H_{1}:\sigma_{I}^{2}-\sigma_{II}^{2}e0
(iv) H_{0}:\sigma_{I}^{2}-\sigma_{II}^{2}e0 versus H_{1}:\sigma_{I}^{2}-\sigma_{II}^{2}=0
