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An instructor for a stat class of 250 students decided that she was going to curve the exam grades if the average is lower than 80. After grading 50 exams, she observed that the average is 77. She knows that the population standard deviation on this test is 10. She wanted to forecast whether a curve is needed using an appropriate hypothesis testing procedure with ?=0.05
What are the appropriate hypotheses?
What is the critical value she should use?
What's the p-value for the appropriate test?
If she changes the a-level, which of the following will change: the test statistic, the critical value, and/or the p-value? Explain your choice(s).
To compare the effectiveness of two treatments 1 and 2 for a particular disease. Patients were separated in 2 treatment groups. A patient in group 1 received treatment 1 and patients in group 2 received treatment 2.
you roll two fair dice a green one and a red one.a what is the probability of getting a sum of 6? enter your answer as
assume that the mean score on a certain aptitude test across the nation is 100 and that the standard deviation is 20
How might variance and standard deviation be applied to a real-world business-related problem? Provide a specific application in which these measures are useful.
Michael's Tire Company performs free tire balance and rotation for the life of any tires purchased there on a first-come, first-served basis. One mechanic handles this and can usually complete the job in an average of 20 minutes. Customers arrive ..
What is the point estimate of the proportion of the population of employees who strongly dislike their current work experience (to 2 decimals)?
The probability that student pilot passes the written test for a private pilot's license is 0.7. Find the probability that the student will pass the test: (a) on the third attempt (b) before the fourth attempt.
If the weight distribution is known to be normally distributed, do the data support the veterinarian's suspicion? Conduct a hypothesis test at the 5% significance level. Define your parameter (μ), state your hypotheses, conduct the test and write ..
the united way conducted two appeals a and b in atlanta. results of the appeals were- 30000 people were targeted in
Assume that the number of calories in 12-ounce soda cans is normally distributed. State the null and alternative hypotheses to test the manufacturer claim.
a certain city divides naturally into ten district neighborhoods. how might a real estate appraiser select a sample of
womens heights are normally distributed with mean 63.7 in and standard deviation of 2.5 in. a social organization for
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