AI Tutor
Back to 10.3 Comparing Two Independent Population Proportions

10.3 Exercise 15

Avg difficulty 2.5

Use the following information for the next five exercises. Two types of phone operating system are being tested to determine if there is a difference in the proportions of system failures (crashes). Fifteen out of a random sample of 150 phones with OS1 had system failures within the first eight hours of operation. Nine out of another random sample of 150 phones with OS2 had system failures within the first eight hours of operation. OS2 is believed to be more stable (have fewer crashes) than OS1.

What is the random variable?

OpenStax Introductory Statistics 2e, 10.3 Comparing Two Independent Population Proportions, exercise 15

AI Tutor

Adapted from Introductory Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Statistics 2e. Imported at revision 50ec917.