According to the Centers for Disease Control, the mean cigarettes smoked per day by individuals who are daily smokers is 18.1. We wanted to know if retired adults who are daily smokers, smoke a different amount than the general population of daily smokers? A random sample of 40 retired individuals who are current daily smokers were taken. The results showed a sample mean= 16.8 cigarettes smoked per day with a Standard deviation=4.7. Assume a normal distribution. Is there sufficient evidence at alpha= 0.05 level of significance to conclude that retired adults who are daily smokers smoke any different to the general population of daily smokers?
According to the Centers for Disease Control, the mean cigarettes smoked per day by individuals who are daily smokers is 18.1. We wanted to know if retired adults who are daily smokers, smoke a different amount than the general population of daily smokers? A random sample of 40 retired individuals who are current daily smokers were taken. The results showed a sample mean= 16.8 cigarettes smoked per day with a Standard deviation=4.7. Assume a
Determine null and alternative hypothesis (first define with words and then symbols)
Null:
Alternative:
H0:
Ha:
Calculate the test statistic (tstat) (use the equation, show your work for full credit)
Conduct hypothesis test: Use the classical/direct approach, p-value approach and confidence interval approach to determine if null should be rejected or not. Draw a graph/model to illustrate (you can do by hand or copy and paste, doesn’t have to be exact) show your work.
A. Classical direct approach:
B. p-value approach:
C. Confidence interval approach:
Write a conclusion regarding your evidence and retired adults.
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