Data Statistics/Hypothesis testing making inferences from a sample

Read scenario and answer all questions in red. Must have good feedback rating..

 

Scenario :

Imagine that the drug for severe depression from this week’s Discussion was approved for use in humans. Researchers now want to know whether people using this drug have a different life expectancy than the rest of the general population. A sample of 100 patients who use the drug are followed over time. Those that use the drug have a mean life expectancy of 71.30 years. The mean life expectancy for the general population is 75.62 years. The population standard deviation is 28.

Assignment:

To complete this Assignment, submit by Day 7 responses to the following:

• Identify the independent and dependent variables.
• Explain whether the researcher should use a one-tailed or a two-tailed z test and why.
• State the null hypothesis in words (not formulas).
• State the alternative hypothesis in words (not formulas).
• Calculate the obtained z score by hand and state the critical value with an alpha of .05. Provide your calculations in your Assignment submission.
• Would you retain or reject the null hypothesis? Why?
• Explain whether the results are significant, and why or why not.
• What should the researcher conclude about the life expectancy of the sample in comparison to the population?
• In general, explain the relationship between z scores and the standard deviation.

Provide an APA reference list.