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Suppose a university advertises that its average class size is 34 or less. A student organization is concerned that budget cuts have led to increased class sizes and would like to test this claim. A random sample of 43 classes was? selected, and the average class size was found to be 36.9 students. Assume that the standard deviation for class size at the college is 9 students. Using α=0.01?, complete parts a and b below.
a. Does the student organization have enough evidence to refute the? college's claim? Determine the null and alternative hypotheses.
the average cost of tuition room and board at small private liberal arts colleges is reported to be 8500 per term but a
If the null hypothesis is true, then the z-score for the sample proportion is:
Given a random sample of size n from a normal population with μ = 0, use the Ney man-Pearson lemma to construct the most powerful critical region of size α to test the null hypothesis σ = σ0 against the alternative σ = σ1 > σ0.
a computer manufacturer is introducing a new product specifically targeted at the home market and wishes to compare the
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
Your manager, who just read an abridged version of a statistics book, wants you to test hypotheses for the difference in two population means.
Find the expected number of violent crimes committed in a 3 month period
Translate the following arguments into symbolic form.- Protein engineering will prove to be as successful as genetic engineering, and new enzymes will be developed for producing food and breaking down industrial wastes.
An automobile company thinks that with new designs, it scars will last longer before having a problem. For this reason the company wishes to extend the warranty that comes with the vehicle in hopes of attracting more customers.
This made the syndicate a big profit over the cost of the tickets it purchased. Two questions come to mind: Is this hogging of tickets unfair to the rest.
A study is done to determine if Company A retains its workers longer than Company B. Company A samples 15 workers, and their average time with the company.
Neither the researchers nor the patients know who is taking the real medication and who is taking the placebo. Is this a blind experiment
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