Question

7. A group of researchers wants to know if a certain exercise program increases bone density....

7. A group of researchers wants to know if a certain exercise program increases bone density. They measure the bone density of 25 subjects. The subjects then perform an exercise program for 6 months. The bone density for the sample of 25 subjects increased by an average of 0.6 points after the exercise program. The sample standard deviation of the differences of bone densities of the 25 subjects is 2.0Execute a hypothesis test at α=0.05. Please perform all steps of a hypothesis test question.

What is the smallest increase that will allow you to reject Ho if the true mean difference is in fact 0?

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A group of researchers wants to examine whether taking multiple practice quizzes improve scores on tests....
A group of researchers wants to examine whether taking multiple practice quizzes improve scores on tests. They compare the exam scores for a sample of n1 = 12 students who took multiple practice quizzes with the test scores of a sample of n2 = 10 students who did not do any practice quizzes. Results of the study revealed that the practice quiz group had M1 = 95, SS1 = 52. The no quiz group had M2 = 92, SS2 =...
A researcher wants to know whether a pharmaceutical intervention to reduce stress is working. N =...
A researcher wants to know whether a pharmaceutical intervention to reduce stress is working. N = 25 individuals are randomly assigned to receive the drug of interest and have a sample mean (M) of 76.4, whereas N = 29 individuals are randomly assigned to receive a placebo pill and have a sample mean of 83.0. Assume α = 0.05. The pooled variance (s2pooled) is calculated to be 12.72. The standard deviation of the distribution for differences between means (sdifference)is calculated...
Researchers want to know if playing violent video games increases aggression levels. They know that the...
Researchers want to know if playing violent video games increases aggression levels. They know that the typical teenager scores an average of μ = 4 on a test of aggression. To evaluate their hypothesis, they take a random sample of n = 5 teenagers and have them play violent video games for two hours. After playing the games the teenagers then are measured with the aggression test, resulting in the following scores: X 4 7 5 6 6 (a) Identify...
Researchers wants to know if taking the herbal supplement St. John's Wort will affect depression. First,...
Researchers wants to know if taking the herbal supplement St. John's Wort will affect depression. First, they measure the depression level of a sample of n = 4 depressed people (Pre-Test Scores). Then after a week of taking St. John's Wort, they again measure the sample's depression levels (Post-Test Scores). Note that high scores on the depression measure indicate more depression, whereas low scores indicate less depression. Participant Pre-Test Scores Post-Test Scores A 9 6 B 12 5 C 13...
True/False 1. Suppose we know for a fact that on a certain memory test, recognition is...
True/False 1. Suppose we know for a fact that on a certain memory test, recognition is not any better than recall. However, the P-value for the data from your sample is 0.04, so you were able to reject the null hypothesis at α = 5%. A Type I Error was committed. 2. Consider the following question: Do women make more visits to their primary care physician in a year than men? If independent samples are taken from both females and...
A certain type of battery produced by Omni Consumer Products has historically had an average lifespan...
A certain type of battery produced by Omni Consumer Products has historically had an average lifespan of no more than 87 hours. Omni believes that an improved production process will be able to increase the lifespan of this battery, but it needs to do some testing before it can conclude anything. Researchers gathered a sample of 36 batteries and found the sample mean lifespan was 88.5 hours, with a standard deviation of 9.1 hours Perform a hypothesis test at the...
PUBH 6033—Week 7 Assignment 1 Comparing two means: When drink drove a student to statistics (Rubric...
PUBH 6033—Week 7 Assignment 1 Comparing two means: When drink drove a student to statistics (Rubric included) Instructions For this assignment, you review this week’s Learning Resources and then perform a two-sample independent t test and an ANOVA related to the dataset that was utilized in the week 2 SPSS application assignment. Import the data into SPSS; or, if you correctly saved the data file in Week 2, you may open and use that saved file to complete this assignment....
Question 21 Suppose a health insurance company is interested in carrying out an investigation as to...
Question 21 Suppose a health insurance company is interested in carrying out an investigation as to the annual expenditures per household on their healthcare costs. In order to most accurately report their figures, the company decides to ensure “virtual certainty” about their estimates by using a Z value of 3.0 for their calculations. The company conducts a SRS of 843 households and determines the sample average household expenditures on healthcare is $43,257.00. A) Assume the company uses a σ=$879.00. Calculate...
When is a hypothesis considered scientific? a. when it is based on something other than observation...
When is a hypothesis considered scientific? a. when it is based on something other than observation b. when it can be tested and is refutable c. when it relies on anecdotal evidence d. when it relies on mystical explanations e. All hypotheses are considered scientific until experiments determine otherwise. 3. Of the following, which is the earliest step in the scientific process? a. generating a hypothesis b. analyzing data c. conducting an experiment d. drawing a conclusion e. developing a...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT