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1. Mrs. Grant wishes to compare the performance of sixth-grade students in her district with the national norm of 100 on a widely used aptitude test. The results for a random sample of her sixth graders lead her to retain Ho:µ = 100 (x - .01) for her population. She concludes, "My research proves that the average sixth grader in our district falls right on the national norm of 100". What is your reaction to such a claim?
9. State the critical values for testing Ho:µ -=500 against H1:µ<500, where
a. x = .01
b. x = 0.5
c. x = .10
2. Suppose a researcher wishes to test Ho:µ = 100 against H1:µ >100 using the .05 level of significance; however, if she obtains a sample mean far enough below 100 to suggest that Ho is unreasonable, she will switch her alternative hypothesis to H1: ≠ 100 (æ = .05) with the same sample data. Assume Ho to be true. What is the probability that this decision strategy will result in a Type I error? (Hint: sketch the sampling distribution and put in the regions of rejection).
Find a 95% confidence interval for the true proportion of patients who experienced cotton mouth. Show your calculations and/or explain the process used to obtain the interval.
At the 5% level of significance, can we infer that the difference in the level of satisfaction with service between the two branches is wider than 5 p.c. points?
Temperature in a certain city for the month of June follows a uniform distribution over the interval 61º F to 91º F. What is the probability that a randomly selected June day has a temperature that exceeds 70º F?
A supermarket advertises that the waiting time spend by customers waiting in line at the cash register is uniform between 0 and 6 minutes.
What is the probability that the contaminated can is selected for testing?
Suppose that p(x) = 3 - 4x + x² is the quadratic Taylor polynomial approximation based at Xο (ο is a subscript for x) = 1 to a function g.
Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population proportion, population standard deviation, etc.
Some television stations attempt to gauge public opinions by posing a question on the air and asking viewers to call to give their opinions.
The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What is the standard error of the mean?
To determine whether there is a difference in the proportion of viewers watching the three channels.
Create a real-world situation or problem involving children who have adhd. Within state the independent and dependent variables you would study
Determine the completion time and standard deviation (σ) for project roundoff the standard deviation to the nearest hundredth: two decimal places.
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