Question

For each scenario described below, identify the null hypothesis (H0) and the alternative hypothesis (HA).

(a) A long-distance roughwater swimming race takes place over a 2.5 mile course. Before the race, a random sample of the current velocity (in knots) along the race course is obtained to determine whether the race should be cancelled. A mean water current velocity of more than 0.65 knots is considered unsafe.

(b) The Australian Department of Transportation reported that, on average, Australians drive 15,300 kilometers per year. An advertising campaign was launched to encourage people to drive less and use public transportation. Six months later, the Department of Transportation conducted a study to determine if the advertising claim was effective.

(c) A marketing research study conducted in 2015 indicated that 11% of all households in the United States have at least one telescope. During May 2015, Venus, Jupiter, and Mercury were visible in a near-perfect triangle formation. A company that manufactures telescopes believes the increased media attention caused more people to buy telescopes in order to see this spectacular sight.

Answer 1