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5-3 assignment: means: test of hypothesis (1-sample)

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Scenario

You have been hired by the Regional Real Estate Company to help them analyze real estate data. One of the company’s Pacific region salespeople just returned to the office with a newly designed advertisement. It states that the average cost per square foot of his home sales is above the average cost per square foot in the Pacific region. He wants you to make sure he can make that statement before approving the use of the advertisement. The average cost per square foot of his home sales is $275. In order to test his claim, you collect a sample of 1,001 home sales for the Pacific region.

Prompt

Design a hypothesis test and interpret the results using significance level α = .05.

Use the House Listing Price by Region document to help support your work on this assignment. You may also use the Descriptive Statistics in Excel and Creating Histograms in Excel tutorials for support.

Specifically, you must address the following rubric criteria, using the Module Five Assignment Template.

  • Setup: Define your population parameter, including      hypothesis statements, and specify the appropriate test.
    • Define your population parameter.
    • Write the null and alternative hypotheses. Note:       Remember, the salesperson believes that his sales are higher.
    • Specify the name of the test you will use.
      • Identify whether it is a left-tailed, right-tailed,        or two-tailed test.
    • Identify your significance level.
  • Data Analysis Preparations: Describe sample summary statistics, provide a      histogram and summary, check assumptions, and find the test statistic and      significance level.
    • Provide the descriptive statistics (sample size, mean,       median, and standard deviation).
    • Provide a histogram of your sample.
    • Describe your sample by writing a sentence describing       the shape, center, and spread of your sample.
    • Determine whether the conditions to perform your       identified test have been met.
  • Calculations: Calculate the p value, describe the p value and      test statistic in regard to the normal curve graph, discuss how the p      value relates to the significance level, and compare the p value to the      significance level to reject or fail to reject the null hypothesis.
    • Determine the appropriate test statistic, then       calculate the test statistic.
      Note: This calculation is (mean – target)/standard       error. In this case, the mean is your regional mean (Pacific), and the       target is 275.
    • Calculate the p value.
      Note: For right-tailed, use the T.DIST.RT function in       Excel, left-tailed is the T.DIST function, and two-tailed is the       T.DIST.2T function. The degree of freedom is calculated by subtracting 1       from your sample size.
      Choose       your test from the following:
            =T.DIST.RT([test statistic], [degree of freedom])
            =T.DIST([test statistic], [degree of freedom], 1)
            =T.DIST.2T([test statistic], [degree of freedom])
    • Using the normal curve graph as a reference, describe       where the p value and test statistic would be placed.
  • Test Decision: Discuss the relationship between the p value and      the significance level, including a comparison between the two, and decide      to reject or fail to reject the null hypothesis.
    • Discuss how the p value relates to the significance level.
    • Compare the p value       and significance level, and make a decision to reject or fail to reject       the null hypothesis.
  • Conclusion: Discuss how your test relates to the hypothesis      and discuss the statistical significance.
    • Explain in one paragraph how your test decision       relates to your hypothesis and whether your conclusions are statistically       significant.







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