Single sample hypothesis testing z-tests1 for the

Assignment Help Applied Statistics
Reference no: EM13371168

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.

Reference no: EM13371168

Reviews

Write a Review

 

Applied Statistics Questions & Answers

  How many different items can be uniquely numbered

What is the name of the counting rule used to find all the possible outcomes and how many different items can be uniquely numbered?

  Develop a second decision tree for sonny

Develop a second decision tree for Sonny and his team to reflect this new option of hiring the research firm prior to the possibility of developing the app

  A chemical company wished to study the consistency of the

a chemical company wished to study the consistency of the strength of one of its liquid chemical products. the product

  Forecasting with time series analysis objective crusty

forecasting with time series analysis objective crusty pizza executives have to forecast december sales for the 10

  Functions of parametric statistical procedures

What would be the appropriate statistical procedure to test the following hypothesis:  "Triglyceride values are a good predictor of weight in obese adults." What are the functions of parametric statistical procedures?

  Senior executives at large corporations

A BusinessWeek/Harris survey asked senior executives at large corporations

  What population value should be used with data

What is the majority of the type of data summarized on the first page of this article and Measurement or categorical - What population value should be used with data? population mean or population proportion

  Find two different news stories in a mainstream media

find two different news stories in a mainstream media source cnn foxnews newsweek etc. that cite data from a recognized

  Which data set has the lowest standard deviation

Create the second data set by inserting eight data points all very close to 10 on the number line and record the standard deviation of this data set, and then delete that data set.

  Solve the simultaneous equations

A graphical method, solve the simultaneous equations - A graphical method, solve the quadratic equation

  The average improvement in time for the population

Let variable X represents the improvement in time for each assembly line worker. Let μ represents the average improvement in time for the population. Has the training improved the time required on the job? Please test the hypothesis use α=0.05 ..

  How to solve statistics for business and economics

Can you please show me step by step how to solve Statistics for Business and Economics, 12 edition, Case Studies: Air Force Training Program (pg. 503-504) and Wentworth Medical Center (pg. 591-592)?

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd