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The bowls were presented in random order and subjects asked which cereal they preferred. The study was repeated independently in a second region. In region 1, of the 400 subjects, 220 perferred the
Suppose we were interested in determining if there were differences in the average prices among two local supermarkets. We randomly pick six items to compare at both supermarkets. Which statistical
A random sample of size 38 is chosen from a population with an unknown mean and variance. The sample mean and standard deviation are 21.6 and 3.5 respectively. Estimate the true mean with a 2% level
The mass in grams from random samples of help from two locations are given below. We wish to know if the Kelp in location A have a larger means mass than the Kelp in location B. Do not assume equal
Data from previous years reveal that the distribution of the final exam scores in an introductory stats class is approximately normal with a mean of 23.2 out of 30 with a standard deviation of 4.94.
Calculate a confidence and prediction interval for DOTEST = 100. Interpret the confidence and prediction intervals given in the output. Do you see any problems with the interpretation of the predict
Letx denote the number of senior executives in a random sample of 10 who hold this opinion. Write the Probability distribution of x and draw a line graph of the probability distribution. find the me
Suppose that two 10k runners are selected at random. Let x be the number of runners in these two who would finish a 10k race in 49:42 or less. Draw a complete tree diagram and use it to write the pr
What is the sandard error of the difference in sample proportions?
At the .05 significance level, can we conclude that college students watch fewer DVDs a month than high school students? Compute the value of the test statistic:
Consider a function F( x) = 3 x^ 2 + cx + 1 , ? 1 < x < 2 and 0 otherwise. Is there a value of c that will make the function a valid pdf?
Discuss the requirements of a linear programming (LP) model. Provide an example of an LP model and define each variable used. What are the key steps that need to be considered when formulating an LP
What is the average tardiness (job lateness) for the sequence using the FCFS rule?
Name two ways to increase the statistical power of an experiment. Explain how each increases the probability of detecting a real effect of the independent variable.
Assume that, as a newspaper reporter, you must graph data showing that increased smoking causes an increased risk of lung cancer. Given that people might be helped and lives might be saved by creati
Suppose the equation of the regression line for the debt per capita for the years 1990-2001 is computed to be debt per capita = -2,231,226 + 1128 x(year) and R2 = 98.8%
A previous analysis of paper boxes showed that the standard deviation of their lengths is 15 millimeters. A packer wishes to find the 99% confidence interval for the average length of a box.
A health researcher read that a 200-pound male can burn an average of 524 calories per hour playing tennis. 37 males were randomly selected and the mean number of calories burned per hour playing sq
According the the U.S. Department of Education, full-time graduate students receive an average salary of $12,800. The dean of graduate studies at a large state university in PA claims that his gradu
A rental car company claims the mean time to rent a car on their website is 60 seconds with a standard deviation of 30 seconds. A random sample of 36 customers attempted to rent a car on the website
Identify the appropriate hypothesis for analyzing this data including the conditions for using this test. Complete the four steps of hypothesis testing necessary to determine whether this group diff
In a Gallop poll of 1012 randomly selected adults, 9% said that cloning of humans should be allowed. We are going to use a .05 significance level to test the claim that less than 10% of all adults s
We know that the average life of a light bulb is 10,000 hours. There are 12 lightbulbs in a classroom. In order for a class to be held in the room,9 or more lightbulbs must be working. Each light b
What is the probability of a randomly selected credit card holder has a credit card balance less than $2,500? Use the standard normal table for this, using the population mean and standard deviation