A wholesaler haş recently developed a computerized sales invoicing system. Prior to implemegting this system, a manual system was used. Historically, the manual system produced 87% of invoices with o errors, 8% of invoices with 1 error, 3% of invoices with 2 errors, 1% of invoices with 3 errors, and 1% of invoices with more than 3 errors. After implementation of the computerized system, a random sample of 500 invoices showed 479 invoices with o errors, 10 invoices with 1 error, 8 invoices with 2 errors, 2 invoices with 3 errors, and i invoice with more than 3 errors. Test to determine if the percentages of errors have changed since introducing of computer systems. 1. Write the Ho and H1 2 Calculate the test statistics 3. What is the critical value? 4 What condlusions would you draw?

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.