Quiz: Business Stats Final If we are testing for the difference between the mean

Question

Quiz: Business Stats Final If we are testing for the difference between the means o.. TABLE 10-14 A problem with a telephone line that prevents a customer from receiving or making calls is disconcerting to both the customer and the telephone company. The data on samples of 20 problems reported to two different offices of a telephone company and the time to clear these problems (in minutes) from the customers' lines are collected. Below is the Excel output to see whether there is evidence of a difference in the mean waiting time between the two offices assuming that the population variances in the two offices are not equal. Test: Twe-Sample Assuming Unequal Veriances ariance Observations Hypothesized Mean Difference 2.951657 20 57055 20 38 0.354386 0.362504 1.685953 0.725009 P(Tent) one-tal Referring to Table 10-14, what assumptions are necessary for testing if there is evidence of a difference in the variability of the waiting time between the two offices to be valid? A sampled populations are normally distributed. No answer text provided Both samples are random and independent Neither A nor B is necessary Both A and B are necessary Question 4

Explanation / Answer

In a two independent sample comparison of mean test (with unequal variance), we assume the following:

1. Populations of concern are normally distributed.

2. Observations are independent within and between samples.

Both A and B are required

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