Mateo has developed a scale to measure a person’s fear of ea…

Mateo has developed a scale to measure a person’s fear of earthquakes. After the occurrence of an earthquake, he surveys 1,000 individuals and finds the mean score to be 7.8 out of a possible 10 (the higher the score, the greater the fear). Mateo concludes that fear increases after people experience an earthquake. This study is an example of a

A researcher asked participants to rate the softness of two…

A researcher asked participants to rate the softness of two well-known brands of tissue paper—Daisy and Flora. Daisy was rated softer than Flora and their mean ratings were 5.50 and 3.25, respectively. This difference was statistically significant at the .05 probability level. The null hypothesis for the population suggests that