I the Alternative Hypothesis States That There Is a Difference

question 3

Multiple Choice

i. The alternative hypothesis states that there is a difference between the observed frequencies and the expected frequencies in a goodness-of-fit test. ii. The number of degrees of freedom appropriate for the chi-square goodness-of-fit test is the number of categories minus 1.
iii. If there are extremely large differences between observed and expected frequencies the correct decision is to reject H₀.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) and (ii) are correct statements but not (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (ii) and (iii) are correct statements but not (i).
• E) (i), (ii), and (iii) are all false statements.

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Definitions:

Electric Arc Welder

A type of welding equipment that uses an electric arc to melt metals at the welding point, allowing them to fuse together when cooled.

Carbon Dioxide

A colorless, odorless gas produced by burning carbon and organic compounds and by respiration, also a greenhouse gas in the Earth's atmosphere.

Stick Welding

A manual welding technique using a fixed-length electrode and electric current to join metal parts.

Electric Arc

A visible plasma discharge caused by electrical current passing through air, used in welding and other industrial processes.