Last year,10 percent of all teenagers in Greenville purchased a new iPhone.This year,a sample of 260 randomly chosen Greenville teenagers showed that 39 had purchased a new iPhone.To test whether the percentage has risen,the critical value at α = .05 is

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The critical value for a one-tailed test at α = .05 is 1.645. This is used to determine if the sample proportion significantly exceeds the hypothesized population proportion.

Last Year,10 Percent of All Teenagers in Greenville Purchased a New