Executives rated service quality in each of several American industries. Assume a sample of ratings are as shown below for the airline, retail, hotel, and automotive industries; higher scores indicate a higher service quality rating. At a 5% level of significance, test for a significant difference in the population mean quality ratings for the four industries. What is the value of the test statistic?
Airlines: 59, 63, 70, 49
Retail: 56, 49, 68, 55
Hotel: 47, 60, 62, 48
Automotive: 46, 54, 69, 49, 55, 56, 59, 50, 54, 55, 48
Select one:
a. 11.64
b. 1.8386
c. 3.13
d. 3.90
The following information was obtained from matched samples taken from two populations. Assume the population of differences is normally distributed.
Individual:
Method 1: 1, 7, 5, 2, 5
Method 2: 9, 3, 6, 8, 4, 7, 7, 5, 6
The 98% confidence interval for the difference between the two population means (Method 1 - Method 2) is:
Select one:
a. -3.776 to 1.776
b. -4.747 to 2.747
c. -1.776 to 2.776
d. -4.747 to 1.776