Service robots in hotels. Refer to the Journal of Hospitality, Marketing & Management (January 2020) study of the quality of service robots in hotels, Exercise 9.44 (p. 557). Recall that the researchers compared services delivered in one of three ways: (1) human staff only, (2) service robot only, and (3) combined human staff and service robot. Each in a sample of 339 adults viewed a photograph that visually portrayed one of the three service conditions. Based on the photos, each participant used a 5-point scale to rate their perception of hotel-guest interaction quality.

a. Write a model for mean interaction quality rating as a function of service condition delivered.

b. The researchers reported the sample mean perception of interaction quality values as 4.27 for human staff only, 3.15 for robot only, and 3.74 for combined staff and robot. Use this information to compute estimates of the b’s in the model.

c. Give the null hypothesis for testing the adequacy of the model.

d. The researchers reported the test statistic for the test, part

c, as F = 74.33 with p@value 6 .01. Interpret this result practically.