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A school administrator wants to see if there is a difference in the number of students per class for Portland Public School district (group 1) compared to the Beaverton School district (group 2). Assume the populations are normally distributed with unequal variances. A random sample of 27 Portland classes found a mean of 34 students per class with a standard deviation of 6. A random sample of 28 Beaverton classes found a mean of 36 students per class with a standard deviation of 5.
Find a 95% confidence interval in the difference of the means. Use technology to find the critical value using df = 50.6214 and round answers to 4 decimal places.
Identify one dimension that would find excess capacity unattractive. Provide 2-3 sentences explanation for each.
Draw a model of the relation {(-6,-8), (3,-3), (-6,-7), (9,7)}. Is the relation a function? Why or why not? Evaluate the function at the specified values of the independent variable and simplify.
Antibiotic or Placebo A large number of surgery patients get infections after surgery, which can sometimes be quite serious.
If the code does not start with a vowel, then there must be 2 consecutive positions in the code which contain the same vowel. (For instance, both baal and blaa are acceptable codes.)
construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
Determine the probability that the system will not fail before 100 hours.
find the number of possible 4-letter sequences (words) where the same letter can appear in the word more than once.
What do researchers learn about the normal distribution from knowledge of the standard deviation?
Scores for a common standardized college aptitude test are normally distributed with a mean of 485 and a standard deviation of 97.
a sample of 35 different hr departments found that employees worked an average of 240.6 days a year. if the
Suppose you have 6 different Math books and 5 different English books.
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