Kizspy | Question: 15
(Choose 1 answer)
(See picture)
A. Only (i)B. Only (ii)
C. Neither (i) nor (ii) is necessary.
D. Both (i) and (ii) are necessary.
The amount of time required to reach a customer service representative has a huge impact on customer satisfaction. Below is the Excel output from a study to see 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.
t-Test: Two-Sample Assuming Unequal Variances
Hotel 2
Mean
Hotel 1
2.0115
Variance
2.951657
20
0
38
3.57855
20
2.214
Observations
Hypothesized Mean Difference
df
t Stat
0.354386
P(T<=t) one-tail
0.362504
t Critical one-tail P(T<=t) two-tail
1.685953
t Critical two-tail
0.725009 2.024394
What assumptions are necessary 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 to be valid?
(i)Both sampled populations are normally distributed.
(ii)Both samples are random and independent.
