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To plan the budget for next year a college needs to estimate what impact the current economic downturn might have on requests for financial aid by next year's freshmen class. Historically 35% of freshmen at this college have needed financial aid. 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?
Based on what we know about statistics and using your example, how do you believe statistics can enrich and represent the results of a study? How can statistics be used to misrepresent the results of a study?
A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter.
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
Is there solid evidence that the earth is getting warming? 69% of 731 male resondents answered yes and 70% of 770 female respondents answered yes.
The Wilcoxon signed rank test is computed for the data and gives a value W + = 161.5. Using the Normal approximation (without the continuity correction) the P-value.
Assume the probability of a tire blowout is 0.178% per 50,000 miles of use and that a person travels 15,000 miles per year in a car.
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
Linda would like to maintain a 90% service level. what safety stock level do you recommend for BX-5?
What is the probability that the cereal would be high calorie? In other words, what is P (high calorie)?
The shell thicknesses of the eggs produced by a large flock of hens follow approximately a normal distribution with mean equal to 0.38 mm and standard deviation equal to 0.03 mm. Find the 95th percentile of the thickness distribution.
During the period of time phone-in reservations are being taken at a local university, calls come in at a rate of one every ten minutes.
An independent-measures research study was used to compare two treatment conditions with n = 4 participants in each treatment. The first treatment had a mean of M = 58 with a variance of s^2 = 28, and the second treatment had M = 52 with s^2 = 36.
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