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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).
Consider the many possible distributions of grades on a quiz in a statistics class; imagine that the grades could range from 0 to 100.
question the manager of a frozen yogurt store claims that a medium-size serving contains an average of more than 4
Then suppose that a sample of 4000 women had produced the sample mean 275, and again give the 95% confidence interval for the population mean. What can you say about the effect of sample size on confidence intervals?
Two pain relief drugs are being considered. A random sample of 6 doses of the first drug showed that the average amount of time required before the drug was absorbed into the bloodstream was ??
Develop regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
Give an example from everyday life where you could use the Normal distribution to determine the probability of something. What is a z score and how could calculating a z help you in a business situation?
How is the null hypothesis chosen (why is it null)? What is the importance of rejecting the null hypothesis in relation of the sample to the population?
Determine the shortest time spent waiting for a heart that world still place a patient in the top 10% of waiting times? In days?"
Solve the equation x^2 + 8x - 2 = 0 using both-Write one paragraph describing which method you prefer and why.
Particular flight involving a jumbo-jet with 261 seats, the airline sells 270 tickets. What is the probability that the airline will not have enough seats for all the ticket holders who show for the flight?
What is the correlation, and why is it so high? Since all of the guessed weights were higher than the actual weights, does that influence the correlation at all?
the u.s. department of transportation national highway traffic safety administration reported that 77 of all fatally
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