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correct but the result was calculated incorrectly)2/ the square root of 18= .47e. Calculate the Z statistic (which indicates where our sample mean is located on the sampling distribution) (1 point total: deduct .5 if the process is correct but the result was calculated incorrectly)4.39-4/.471= .83f. Determine the critical Z value(s). Explain how you find the answer. (1 point: .5 for the Z value, .5 for therationale) Find .05 on the Z table = 1.64. I found my answer by looking at 5% on the z table in the “in tail” column to find the Z value. g. Compare the Z statistic with the appropriate critical Z value and then draw a conclusion about the result of the hypothesis test.- Is the Z statistic more extreme than the critical Z? (.5 point)- Do you “reject” or “fail to reject” the null hypothesis? (.5 point) -Z statistic is not more extreme-We fail to reject the null hypothesis h. Write a sentence to answer the research question (you can use the wording from the hypotheses or explain it in another way) (1 point)
PSY230Summer B 2021We fail to reject the null hypothesis because there is not sufficient evidence that Flagstaff has more mobile phones than the national average.i. Calculate the standardized effect size (1 point total: deduct .5 if the process is correct but the result was calculated incorrectly)4.39-4/ 2= .195 or .20Q2. Hypothesis Testing with a Z Test (12.5 points)According to the CDC report, the mean life expectancy in the US population is currently (µ) 77.8 years with a standard deviation (σ) of 14. A researcher examined the age of death of 55 people recently recorded in several Arizona hospitals and calculated the mean to be 80.6 years old. He runs a two-tailed Z test with α= .05 to see if Arizona has a significantly different life expectancy compared to the US population. Because the researcher is not predicting a direction, the hypotheses should be non-directional and the test should be two-tailed. a. What is the dependent variable in this research question? (.5 point)Number of deaths b. What should the null and alternative hypotheses? State each hypothesis using both words and statistical symbol notation. (2 points total. 1 for each hypothesis: .5 for written, .5 for notation)null: Arizona has no significant difference in life expectancy compared to the US.= HoH1Alternative hypothesis: Arizona has a significantly different life expectancy compared to the U.S.H1 =Hoc. Calculate standard error (SE, which is the standard deviation of the sampling distribution) (1 point total: .5 if the process is correct but the result was calculated incorrectly)14/ Square root of 55= 1.89 d. Calculate the Z statistic (which indicates where our sample mean is located on the sampling distribution) (1 point total: .5 if the process is correct but the result was calculated incorrectly)80.6-77.8=2.8/1.89=1.48e. Determine the critical Z value(s). Explain how you find the answer. (1 point: .5 for the Z value, .5 for the rationale, deduct .5 if only one Z value is mentioned)

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