# 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.

**Answers 2**

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**Assignment Instructions****Application: Hypothesis Testing: Making Inferences from a Sample**Hypothesis testing is the foundation of conducting research in psychology. Researchers must first …