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Imagine that the following sentence is from a Results section. Identify what is wrong with it. "There was a significant effect of gender at the .01 level, with a t-score of 10.2 for 9 degrees of fre
Conduct the appropriate analysis of these data and determine whether there are any significant differences.
Is there a difference in the amount of time it takes to develop anemia in patients with Head and Neck, Breast, Lung, and GI-Colorectal cancer? (Null and Alternative Hypothesis required).
In a test of weight loss programs, 198 subjects were divided such that 33 subjects followed each of 6 diets. Each was weighed a year after starting the diet and the results are in the ANOVA table be
Recent recommendations suggest 60 minutes of physical activity per day. A sample of 50 adults in a study of cardiovascular risk factors report exercising a mean of 38 minutes per day with a standard
Find the critical value ta(alpha)/2 that corresponds to a confidence level of 95% and a sample size of 11.
A researcher believes exercise reduces anxiety in women. She identifies a group of women who had not exercised before but are now planning to begin exercising.
Normal Distribution: If the mean per capita income in the U.S. is $39,000 and the standard deviation is 5000 - What percent of the population.
What is the mean number of people who will drop out of the Platinum Program in the first four weeks in a sample of this size? What is the standard deviation?
A rapid test for the presence in the blood of antibodies to HIV, the virus that causes AIDS, gives a positive result with probability about 0.004 when a person who is free of HIV antibodies is test
The count of correct guesses in 20 cards has a binomial distribution. What are n and p? What is the mean number of correct guesses in many repetitions of the experiment? What is the probability of exa
Virginia is the star player on her middle school basketball team. If she makes 3 free throws and misses 2 free throws during a game, in how many ways can you arrange the sequence of hits and misses?
Using this data 25.5,26.1,26.8,23.2,24.2,28.4,25,27.8,27.3 and 25.7, construct a 95% lower confidence interval on mean battery life.
Suppose you're given a data set that classifies each sample unit into one of four categories: A, B, C, D. You plan to create a computer database consisting of these data
Do the data provide sufficient evidence to indicate a difference in mean times to absorption to indicate a difference in mean times to absorption for the two drugs? Test using ? = 0.05. Find the ap
According to the 2003 Law Enforcement Management and Administrative Statistics (LEMAS) survey, there was a mean of 1.32 (s = .85) officers per 1,000 citizens across the 201 cities with populations b
Find the mean and variance of W , without yet deriving the PDF. Show that the distribution of W is symmetric about 0, without yet deriving the PDF.
They both arrive independently with Beta(a = 2, b = 2) distributed times, where the r.v. represents the number of hours after noon. What is the probability they will meet for lunch that day? Hint: i
Draw the tree for Red Cat's decision problem and determine the optimum decision based on expected values. Include the possibility of launching or not:
The time between arrivals of large comets on earth is exponentially distributed with a mean of one year. What is the shorterst periof of time during which you have at least 90% probability of seeing a
Within what limits should the middle 99% of the individial parts be? Within what limits does the middle 99% of the sampling distribution for samples of size 4 fall?
A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the pe
Use the ATAR model to determine the potential market share for a product concept assuming that it will achieve a trial rate of 25%, 80% awareness in the market, and 65% availability in stores.
Therefore it is an experiment of comparing three populations by selecting independent samples. Use a Kruskall- Wallis test to test the null hypothesis that the populations have the same median, with