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The pet-drug market is growing very rapidly. Before new pet drugs can be introduced into the market place, they must be approved by the U.S. Food and Drug Administration. In 1999, the Novartis Company was trying to get Anafranil, a drug to reduce dog anxiety, approved. According to an article Novartis had to find a way to translate a dog's anxiety symptoms into numbers that could be used to prove to the FDA that the drug had a statistically significant effect on the condition.
a. What is meant by the phrase statistically significant effect?
b. Consider an experiment in which dogs suffering from anxiety are divided into two groups. One group will be given Anafranil, and the other will be given a placebo. How can you translate a dog's anxiety symptom into numbers? In other words, define a continuous variable, X1, the measurement of the drug Anafranil, and X2, the measurement of the effectiveness of the placebo.
c. Building on your answer to part (b) define the null and alternative hypotheses for this study.
The average amount of time between a score by either team in college soccer games is 15.2 minutes.
Transportation problem using the stepping stone method
Bay Area University enrolls MBA students in three cohort programs: Weeknight, Saturday, and Distance. Dean Ed Epstein wants to know if there is a difference in the average of the students in the three programs.
Two independent samples of sizes 16 and 26 were taken. In a test of equality of population means of the two samples, how many degrees of freedom are associated with the critical t-value?
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
The average price of a personal computer is 949 assuming that the prices are normally distributed with a standard deviation of 100 what is the price that corresponds to the least expensive 10%.
The average height of american woman is distributed normally, with a mean of 63.5 inches and a standard deviation 2.5 inches. Approximately what percentage of american women are taller than 58.5 inches,
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
Explain why the t distribution is used as a part of the confidence interval.
The following confidence interval is obtained for a population proportion, p:(0.458, 0.490). Use these confidence interval limits to find the point estimate, p-hat.
Describe why ordinary least squares solution is not unique. What can you say about residuals of any solution? Is ridge regression solution unique? Explain why or why not?
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