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Back to 8.4 Calculating the Sample Size n: Continuous and Binary Random Variables

8.4 Exercise 1

Avg difficulty 2.5

Suppose a mobile phone company wants to determine the percentage of customers who would upgrade to the latest-version smartphone from their current smartphone. How many customers should the company survey in order to be 90% confident that the estimated (sample) proportion is within three percentage points of the true population proportion of customers who would upgrade to the latest-version smartphone?

OpenStax Introductory Business Statistics 2e, 8.4 Calculating the Sample Size n: Continuous and Binary Random Variables, exercise 1

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