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I conducted a blind taste test with 50 subjects (30 women, 20 men) to see if they could tell the difference between bottled and tap water.
Let's say I have a new drug that I think helps diabetics. So I perform clinical trials in accordance with the FDA requirements.
Select one psychological personality assessment instrument or inventory to serve as the basis of this assignment.
Explain why t distribution tends to be flatter and more spread than the normal distribution.
To test the hypothesis that students who finish an exam first get better grades, Professor Barker kept track of the order in which papers were handed in.
The U.S. Fish and Wildlife Service's report on the bass population in the North American lakes indicated average weight of the fish to be 3.0 lb.
Define the null hypothesis. If the null hypothesis is rejected then?
How do you decide your null and alternative hypotheses?
In a field study of mating behaviour in the Mormon cricket, a biologist noted that some females mated successfully while others were rejected
The duration of human gestation is on average 40.5 weeks. In a maternity ward, we note the gestational age of 100 consecutive newborns.
Suppose that the sales manager of a large automotive parts distributor wants to estimate as early as April the total annual sales of a region
(a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic. (d) Make a decision. (e) Estimate the p-value and interpret it
For the preceding problem you should find that there are significant differences among 3 treatments.
To evaluate the effect of a treatment , a sample of n=9 is obtained from a population with a mean of m=40 and the treatment is administered to the individuals
The association of Home Builders provided information on the cost of the most popular home remodeling projects.
Here are heart rates for a sample of 30 students before and after a class break. At a = .05, was there a significant difference in the mean heart rate?
A half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process
The t distribution is a continuous distribution
The number of degrees of freedom corresponding to between treatments is?
Steps of Hypothesis testing, test that there is no difference between each set.
According to Giving and Volunteering in the United States, 2001 Edition, the mean charitable contribution per household in the United States
The EPA fuel economy rating says that the Toyota Prius hybrid car gets 48 mpg on the highway. Deborah wonders whether the actual long-term average
Managers at an automobile manufacturing plant would like to examine the mean completion time, mu, of an assembly line operation
The following data were obtained in a study using three separate samples to compare three different treatments.
You will be asked to determine the correct decision (Reject Ho or Fail to Reject Ho) for each of the following tests of hypotheses.