A study reported in Human Factors (Apr. 1990) investigated the effects of recognizer accuracy and vocabulary size

Question:

A study reported in Human Factors (Apr. 1990) investigated the effects of recognizer accuracy and vocabulary size on the performance of a computerized speech recognition device. Accuracy (x1) of the device, measured as the percentage of correctly recognized spoken utterances, was set at three levels: 90%, 95%, and 99%. Vocabulary size (x2), measured as the percentage of words needed for the task, was also set at three levels: 75%, 87.5%, and 100%. The dependent variable of primary interest was task completion time (y, in minutes), measured from when a user of the recognition device spoke the first input until the recognizer displayed the last spoken word of the task. Data collected for n = 162 trials were used to fit a complete second-order model for task completion time (y), as a function of the quantitative independent variables accuracy (x1) and vocabulary (x2). The coefficient of determination for the model was R2 = .75.

a. Write the complete second-order model for E(y).

b. Interpret the value of R2.

c. Conduct a test of overall model adequacy. Use α = .05.

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question

Statistics For Engineering And The Sciences

ISBN: 9781498728850

6th Edition

Authors: William M. Mendenhall, Terry L. Sincich

Question Posted: