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Single sample hypothesis testing: z-tests
1. For the population at large, test scores on the Wechsler Intelligence Scale for Children are normally distributed with a mean (μ) of 100 (σ = 15). School district officials wonder whether, on average, the IQ scores of the students in their district differ from the population average. Wechsler IQ scores are obtained for a random sample of 150 of their students, and the mean IQ is found to equal 102. Compute the single-sample z-test to see if there is a difference between the sample and the population. Test the null hypothesis at the .05 level of significance. List your answer in terms of the 6 hypothesis testing steps and provide an explanation of your results in Step 6.
2. Assume that in the population healthy young adults dream an average (μ) of 90 minutes (σ = 10) each night, as inferred from a number of measures, including rapid eye movement. An investigator wishes to determine whether the consumption of coffee just before sleep reduces the amount of dreamtime. After they have consumed a standard amount of coffee, dreamtime is monitored for each of 30 young adults in a random sample. Results show a sample mean, M, of 89 minutes. Compute the single-sample z-test to see if caffeine reduces dreamtime. Test the null hypothesis at the .05 level of significance. List your answer in terms of the 6 hypothesis testing steps and provide an explanation of your results in Step 6.
Calculate the mean and standard deviation and Based on these statistics, describe how these anthropometric data compare to the US male and Chinese female populations.
Develop a Pareto chart to identify the more significant types of rejection.
A screening test for a newly discovered disease is being evaluated. In order to determine the effectiveness of the new test, it was administered to 900 workers; 150 of the individuals diagnosed with the disease tested positive.
Minimize the production cost and the optimal order quantity is cartons of milk, and the average inventory is about cartons - variable cost of making
What test or tests would you use to rule out chance from causing the apparent differences in these data and is there a significant correlation?
Draw a time line to show the cash flows of project. Evaluate the projects payback period, profitability index net present value and internal rate of return
Examine statistical data consisting of records of car accidents on Victorian roads and freeways in 2012
Filtering and Summarizing Data
Your write-up of this experiment should include your work to determine the n, your methodology, your record of the experiment, your confidence interval, your interpretation of the confidence interval, your formal hypothesis test and your comments ..
Research paper examines determine the impact of social media use on student learning.
Write a sentence demonstrating how a research report would present the results of the hypothesis test and the measure of effect size and determine whether there are any significant differences among the three treatment means.
Evaluate the correlation coefficient.
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