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A consumer advocate wants to find out if motivational speakers can actually improve people's earning power. He randomly selects a group of 25 people in his city and invites them to participate in a motivational course. He pays for the course if the participants all agree to share their income tax figures for the year before and the year after they take the course. He also pays the subjects a fee for participating in the study. The data summarized below is the results in terms of annual income before and after the course. Use a t-test for correlated groups to determine whether or not the motivational speaker has had an effect. What can you conclude if you use the appropriate 1 tail test and an alpha level of 0.01?
Sketch the distribution of sample means for sample of n = 25 scores from this population.
A check of dorm rooms on a large college campuses revealed that 38% had refrigerators, 52 percent had TVs and 21 percent had both a TV and a refrigerator. What's the probability that a randomly selected dorm room has.
consider the formula used for any confidence interval and the elements included in that formula. what happens to the
Recognize and examine the research question which applies to your organization. Create a 350- to 700-word milestone. Select the organization with which your team is familiar.
Statewide real estate sales agency, Farm Associates, specializes in selling farm property in state of Nebraska. At.10 significance level, has there been an increase in selling time?
1. a normally distributed population has a mean micro32 and a standard deviation ?7. for a set of samples of size
you are given the following information obtained from a random sample of 4 observations from a large normally
A sample of 420 families revealed the following. At the 0.05 significance level, is there a difference in the proportion of customers that prefer each day of the week?
In this problem I am having an issue trying to determine what equation to use to solve. Is this a one or two way ANOVA or should I just use a z-test to solve?
suppose you were given the task of estimating the proportion of drivers in troy al who text while they drive. discuss
A weight-loss clinic advertised that last month its patients
Vince Showers, Managing Director for Sleaz Entertainment, claims that the average age of their customers is at least 23. If this is not the case, Showers will face charges of violating local ordinances regarding public decency.
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