In Research on Cell Phone Use by Teenagers,it Was Found

question 28

Essay

In research on cell phone use by teenagers,it was found that the average connect time for a call was at least 15 minutes.Social psychologists feel that this study understated the time.To determine this claim,cell phone bills for 15 teenagers were evaluated.On average,the time spent was 18.5 minutes,with a sample standard deviation of 4 minutes.(Assume a normal distribution. )Calculate the appropriate test statistic to test the hypotheses.

---

Definitions:

Flu Epidemic

refers to widespread outbreaks of the influenza virus that can affect large populations across multiple continents, such as the 1918 Spanish Flu pandemic.

Healthy Young Adults

Individuals typically aged between 18 and 35 who are in a stage of optimal physical health, often characterized by high levels of activity and low risk of disease.

Republicans

A political party in the United States, traditionally characterized by a conservative ideology, emphasizing limited government and free-market principles.

League of Nations

An international organization founded after World War I to promote world peace and cooperation, but ultimately unable to prevent World War II.