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One of the most commonly used statistical techniques is the comparison of two means, also known as the t-test
Billie wishes to test the hypothesis that overweight individuals tend to eat faster than normal-weight individuals
T-tests compare two groups. For each question, please divide your independent variable into two groups.
Any conclusion drawn for the t-test statistical process is only as good as the research question asked and the null hypothesis formulated
Suggest one psychological research question that could be answered by each of the following types of statistical test:
Compare the lives of generic batteries to the lives of brand name batteries using the given data.
The Department of Economic and Community Development (DECD) reported that in 2009 the average number of new jobs created per county was 450.
If you live in California, the decision to buy earthquake insurance is an important one. A survey revealed that only 133 of 337 randomly selected residences
You are provided with the heights of male and female participants:
A nutritionist heard on the radio an amazing new diet drink that if taken at bedtime you will lose weight as you're sleeping.
The president of a large accounting firm is required to send employees back to school each year to catch up on the latest changes to tax laws
Why do you use N-1 rather than just N when calculating the standard deviation as estimated from a sample? How does the t-statistic differ from the z-statistic?
Thirty data points on Y and X are employed to estimate the parameters in the linear relation Y = a + bX. The computer output from the regression analysis is
A real estate agent claims that there is no difference between the mean household incomes of two neighborhoods
You have noticed that more primary children are becoming obese and physical fitness has been terminated in the elementary schools.
Recall that the cigarette industry requires that models in cigarette ads must appear to be at least 25 years old.
Thirteen randomly selected volunteer A,B,...,M are administered a pill designed to lower systolic blood pressure with the following results.
For the following, which type of t-test is required? A) Studying the effects of a memory drug on Alzheimer's patients, testing a group of patients
A new weight watching company, FatZilla, advertises that those who join their program average at least a 10 pound weight loss during the first two weeks
Write the hypotheses that would be used to test the hypothesis that the production before replacing the bearings was greater than after replacing them.
You work at a major regional hospital and you are concerned about waiting times in the emergency room. This file contains data on some random samples of patient
Test H0: µ1 = µ2; H1: µ1 > µ2 at a = 0.05, when 1 = 75, 2 = 72, s1 = 3.3, s2 = 2.1, n1= 6, n2= 6. Assume equal variances.
The mid-distance running coach, Zdravko Popovich, for the Olympic team of an eastern European country claims that his six-month training program
Suppose that you wish to compare the characteristics of tuberculosis meningitis in patients infected with HIV and those who are not infected.
A study of cats and dogs found that 25 of 50 cats and 37 of 60 dogs slept more than 10 hours per day. At the .05 level of significance