Question

Dentists believe that 53% of the general population suffers from tooth decay. The makers of Toothy Grin Toothpaste believe that using their product reduces tooth decay, and in order to support their claim study a random sample of 2000 Toothy Grin users. It turns out that 1010 of these are suffering from tooth decay. The evidence is investigated to see whether these figures present enough evidence to indicate a decrease in tooth decay for the Toothy Grin users (Use a 0.05 significance level).

What is the z-stat?

What is the p-value?

What is your decision for the hypothesis test above? Retain or reject Ho?

Please write a statement that summarizes your findings from the hypothesis test above.

Answer 1