Construct confidence interval for proportion of all sales

Reference no: EM131405193

In examining a simple random sample of 100 sales invoices from several thousand such invoices for the previous year, a researcher finds that 65 of the invoices involved customers who bought less than $2000 worth of merchandise from the company during that year.

Construct a 90% confidence interval for the proportion of all sales invoices that were for customers buying less than $2000 worth of merchandise during the year.

Reference no: EM131405193

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