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A community college administrators would like to know how many credit hours on average, each student takes per quarter. A random sample of 250 students yields a mean of 14.1 credit hours per quarter with a standard deviation of 2.3 credit hours per quarter. Estimate the mean to within 0.1 hours at 95% reliability and assume the sample standard deviation provides a good estimate for the population standard deviation. How large a sample do they need?
a company is criticized because only 19 of 49 executives at a local branch are women. the company explains that
for testing the difference between two population proportions the pooled proportion estimate should be used in the
What would be the calculated probability based on relative frequency?
The first-order model was fit to n = 19 data points with the results shown in the SAS printout provided below.
Use stratified random sampling to estimate the mean or total of a population of your choice. In the process of carrying out the survey and making the estimate, think about or discuss with others the following:
Your data consist of observations on the weight gain over a four-week period of several subjects (measured in pounds) and the food intake of these subjects.
an example of a dummy variable is time to products first repair in years.select
What is the best predicted IQ of the twin born first twin born first?, given that the twin born second twin born second has an IQ of 106??
Make up a scatter diagram with 10 dots for each of the following:
You are the CIO of a small company with a rapidly growing customer base. Which CRM system would you use: an on-premise CRM system, an on-demand CRM system, or an open-source CRM system?
Pasteurized milk may not have a standardized plate count (SPC) above 20,000 colony-forming bacteria per milliliter (cfu/ml).
Given the following number of hours between breakdowns for 4 machines, are the machines significantly different? If so, how are they different? Which machine is the best? Which machine is the worst?
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