Question

A research report claims that 20% of all individuals use Firefox to browse the web. A software company is trying to determine if the proportion of their users who use Firefox is significantly different from 0.2. In a sample of 200 of their users, 26 users stated that they used Firefox.

Required:
Using this data, conduct the appropriate hypothesis test using a 0.01 level of significance.

Answer 1

Reject H0

Explanation:

Z = -2.474873734

survey (positive) 26

n (total) 200

p 0.2

p /point est. 0.13

POPULATION(min) 4000

np >= 5 ? YES 40

n(1-p) >= 5 ? YES 160

Sample is valid

Confidence Level - "P" values

99% 2.58

Confidence Interval - "P" values

(0.0686 , 0.1914 )

Reference=0.2 Reject H0