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A textile mill weaves cloth that is used to make sheets. The top grade of sheets has at least 200 threads per inch. (Because higher thread count indicates higher quality, it will not matter if the thread count is above 200.) Random samples from 35 areas of a piece of cloth result in an average thread count of y = 190 with s = 50.
(a) Test the appropriate hypothesis by comparing with a critical value using o: = 0.05, and explain what your results mean.
(b) Compute the p-value for the test in part (a) and use it to perform the hypothesis test.
adult consumers at three fast-food hamburger chains at lunchtime in new york city were approached as they entered the
Is there evidence that a stock split causes excess returns for the month following the split? Redo the problem, using the sign test. Compare the results of the sign test with those of the Wilcoxon test.
an important application of regression analysis in accounting is in the estimation of cost. by collecting data on
The director of a radio broadcasting company wants to determine whether the mean length of commercials on his station is equal to 24 seconds.
The average salary for graduates entering the actuarial field is $40,000. If the salaries are normally distributed with a standard deviation of $5,000, find the probability that
Compute the coefficient of correlation. Evaluate the strength of the relationship by computing the coefficient of determination.
A researcher wants to see if urban, suburban and rural communities differ in terms of the support for food banks. The researcher randomly chose 4000 food banks from around the country and interviewed the director of each. Calculate the degrees of ..
Investors use probabilities to decide among several potential investments and calculate potential returns, or losses. An investor has the possibility to invest $2 million in three different schemes.
ken ramsing has been in the lumber business for most of his life. kens biggest competitor is pacific woods. through
To get a sense of the data, provide two well labeled scatter-plots of 1) revenue vs. budget, and 2) revenue vs. screens. Also, provide a correlation matrix of these three variables
If the F test indicates significant differences at the 0.05 significance level, apply Tukey's HSD to see if there is a slugger who stands out with the lowest average. Is there a slugger with an average significantly higher than the rest? Is Bonds ..
a large city claims that it provides free lunch to more than 30 of its elementary school students. a researcher selects
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