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Write a function to simulate data as described on page 17 in ESL for one of the classes. Your function should take as inputs a 102 matrix of centroids, the sample size, and the noise variance. Generate a training sample of size 100 for each class, as well as a test sample of 5,000 per class. (Best to generate the centroids matrices per class once and store them). Try and write elegant code, that makes use of the matrix/vector facilities in R.
The data (in milliamps) are shown below. Using the .05 level of significance, are there any differences in the three categories.
A random sample of 100 students at Southern University was collected. The mean age was found to be 24.2 years, with a standard deviation of 3.4 years.
Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
A state meat inspector in lowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled " 3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
Provided an example of a research problem at any organization that would benefit from the employ of either descriptive statistics or probability distribution statistics.
Students in the social work course received the following course grades. Create a frequency distribution for this data. Compute the mean. Determine the median.
A standard deviation of 4,000 miles. The tires carry a warranty for 35,000 miles. a. What proportion of the tires will fail before warranty expires?
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles.
If 20 students in the class said they frequently experience stress in their daily lives, would you be surprised? Explain and use statistics to support your answer
All the pupils took the same achievement test, and the means for groups receiving different methods were compared. What was the dependent variable?
What are some examples of each of the trend types (Secular/Linear)? What external factors might affect each of the different types of trending?
Assume a normal distribution applies and alpha = 0.05 (Use Z table), find the Critical value for the alternative hypothesis:
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