Kizspy | Question: 22
(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.
BIOXES/LOW.COM.
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
Mean
Variance
Hotel 1
2.214
2.951657
Hotel 2
2.0115
3.57855
Observations
20
20
Hypothesized Mean Difference
0
df
38
t Stat
0.354386
P(T<=t) one-tail
0.362504
t Critical one-tail
1.685953
0.725009
2.024394
P(T<=t) two-tail
t Critical two-tail
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.
