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comparing the weight of every person in a group of people before they went on a diet with their weight after they completed the diet program. I would want to know whether each person's weight after the program significantly greater than their weight beforehand. 2 sets of groups coming from the same set of people. One set represents the weight before treatment. The other set represents the weight after treatment. In a case like this use a paired-sample t-test. assist with setting up this formula.
For the statement: The mean amount of Pepsi in cans is at least 12 oz. Express the null hypothesis and the alternative hypothesis in symbolic form.
She selected a random sample of 50 students from each of the four dormitories. What is the null hypothesis for this situation?
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 500 and a population standard deviation of 6 and a sample size of 18.
Let X 1 , X 2 , X 3 , X 4 be a random sample from a Poisson distribution with parameter λ and let Y = X 1 + X 2 + X 3 + X 4 . You decide to test λ = 1.60 versus λ
Model Fitness. With any statistical model, we assess the fit: Does the model accurately depict the truth? Explain how one of the following helps assess the "fitness" of the mean.
There is an advantage in stating the hypothesis both in the null and in the alternative; it adds clarity to our thinking of what we are testing. Explain.
State the decision rule using the .01 significance level. Compute the value of chi-square. What is your decision regarding Ho?
Run an ANOVA using only groups 1 to 6 (You can hide group 7 from the analysis by data followed by select cases and then you filter out group 7 by if GROUP~= ). Also run the posthoc tests LSD and Bonferroni.
The factorial structure of treatments. What does this plot recommend about suitability of no-interaction assumption here?
24 of the students in the sample received an "A". Test the instructor's claim at a 5% level of significance. What is your conclusion?
In his wardrobe at home, a businessman has 7 suits and 8 ties. From those suits and ties he has on hand, he plans to take 3 of the 7 suits and 2 of the 8 ties with him to a conference in San Francisco.
Suppose that 30% of all adults in Ohio support the increase. The probability that at least 800 people support the increase is?
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