Reference no: EM131009075
Assignment: t-Test
Using data to compare a sample to the whole population or another targeted sample of people can help researchers make predictions about future behavior or phenomena. Comparisons and predictions such as these can answer research questions and can make an argument or statement more persuasive. When there are two groups to compare, tools such as the one-sample t-test and the two-sample t-test allow researchers to make such predictions and comparisons.
This application will allow you to further practice hypothesis testing by using a t-test to compare scores from two samples in order to determine if results are statistically significant. Download the data set that you will use for this assignment from the Weekly Data Set forum found on the course navigation menu. Be sure to watch this week's instructional video in the introduction or Learning Resources folder before beginning your Application Assignment.
Scenario: Imagine you are a researcher who is interested in how sleep deprivation impacts reaction times when driving. You randomly select a sample of 30 licensed drivers. Fifteen participants are randomly assigned to get 5 hours of sleep for three consecutive nights. The other 15 participants are randomly assigned to get 8 hours of sleep for three consecutive nights. For the purposes of this Assignment, assume that all participants sleep exactly the required amounts. After the third night, all participants take a driving simulation test that measures their reaction times.
You can find the data for this Assignment in the Weekly Data Set forum.
To complete this Assignment, submit by Day 7 a response to each of the following. Use SPSS to determine if amount of sleep is related to reaction time.
1. Explain whether the researcher should use an independent-samples t-test or a related-samples t-test for this scenario. Provide a rationale for your decision.
2. Identify the independent variable and dependent variable.
3. Knowing the researcher believes that people who sleep less will have slower reaction times, state the null hypothesis and alternate hypothesis in words (not formulas).
4. Explain whether the researcher should use a one-tailed test or two-tailed test and why.
5. Identify the obtained t value for this data set using SPSS.
6. State the degrees of freedom and explain how you calculated it by hand.
7. Identify the p value using SPSS.
8. Explain whether the researcher should retain or reject the null hypothesis. Provide a rationale for your decision. Are the results statistically significant?
9. Explain what the researcher can conclude about the relationship between amount of sleep and reaction times.
Why the light vibrating in the plane of incidence
: Why the light vibrating in the plane of incidence is not reflected at Brewster''s angle
|
How you could enhance the organisations image
: How you could model high standards of management behaviour ad performance - How you could enhance the organisations image
|
Identify the project scope the pricing cost control
: Generate a paper that explains how you are planning to incorporate quality management initiatives into the project environment. Identify the project scope, the pricing, cost control and estimating techniques to be employed, as well as a summary of..
|
Find maximal interval for which the newton method iterates
: Consider applying Newton's method to find the root α = 0 of the equation sin (x) = 0. Find the maximal interval (-r, r) for which the Newton method iterates will converge to α for any choice of x0 in (-r, r).
|
Identify the independent variable and dependent variable
: Explain whether the researcher should use an independent-samples t-test or a related-samples t-test for this scenario. Provide a rationale for your decision. Identify the independent variable and dependent variable
|
Create a chart evaluating three age-related stereotypes
: Create a chart evaluating three age-related stereotypes listing evidence that supports the stereotype (if it exists) and evidence that contradicts the stereotype
|
Problem regarding the delivery service
: A company must decide which of two delivery services they will contract with. During a recent trial period, they shipped numerous packages with each service and have kept track of how often deliveries did not arrive on time. Here are the data.
|
Estimate the total amount of the drug present
: A patient receives 3 milligrams of a certain drug each day. Each day the body eliminates 20% of the amount of drug present in the system. Estimate the total amount of the drug present after extended treatment, immediately after a dose is given.
|
Effects of television on frequent viewers
: Many people wonder about the effects of television on frequent viewers. It's time to take the role of psychologist-in-training and tackle this question seriously using rigorous methods of science. Your job is to devise two studies for investigatin..
|