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The average selling price of BlackBerry smart phones purchased by a random sample of 35 customers in 2010 was $311. Assume the population standard deviation was $35.
a) Construct a 90% confidence interval to estimate the average selling price in the population with this sample.
b) What is the margin of error for this interval?
What is the expected number of students who have registered on a pass/fail basis? What is the probability that more than three are registered on a pass/fail basis?
please answer both questions using a minimum of 100 words. use examples or references to support the solution. all
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big?
In a random sample of 150 freshman applications received thus far, 67 of the applicants request financial aid. Is there evidence that the proportion of next year's freshmen class needing financial aid has increased?
About 5.5 percentage points in either direction from what would have been obtained by seeking out all Ohio State University female students." Do your results agree with this statement?
Do the above values appear to be in statistical control, justify your answer?
State the null hypothesis and alternative hypothesis. Indicate the type of test to be performed (left-tailed, right-tailed, or two tailed). Provide a statement in terms of the hypothesis testing process in this problem that would signify a Type I ..
For the data, F=0.46 and the P-value equals 0.63. What can you conclude? d. What were the assumptions on which ANOVA was based? Which assumption is the most important?
Fred, on the other hand, has opted to administer to his cat, Heisenberg, Dr. Zelinski's Is Your Cat Smarter Than This Rock?
The engineers hoped to base their decision on the reactions of 50 drivers, but time and budget constraints may force them to cut back to 20. How would this affect the power of the test? Explain.
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
1. a large tank of fish from a hatchery is being delivered to a lake. the hatchery claims that the mean length of fish
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