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1. A random sample of 20 students yielded a mean of x¯ = 72 and a variance of s2 = 16 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% con- ?dence interval for s2.
2. that s2= 1 is valid. Assume the population of battery lives to be approximately normally distributed.
statistics released by the national highway traffic safety administration and the national safety council show that on
Suppose the mean time that was observed for the sample last month was 4 hours 44 minutes (284 minutes). What is the probability of seeing a sample mean this high or higher?
What is the probability that the mean for a random sample of 144 accounts receivable drawn from a population of 2000 accounts with a mean of $10,000 and a standard deviation of $4000 will be between $9500 and $10,500
Use the Kolmogorov-Smirnov test with significance level 0.05 to decide whether the following lifetimes (in days) of a sample of cancer bearing mice.
Compute the sample sizes for Exercise 1 when the finite-population correction factor is ignored. What do you conclude about the importance of the finite population correction factor for this population?
Does thus data support the researchers' hypothesis? Test the relevant hypothesis using a = .1 by first calculating a p-value.
Jim Sears manufactures farm equipment. His work requires the use of steel bars which must have a mean length of at least 50 inches. The bars can be purchased from a supplier in Kansas
Six different categories of transportation risk were discussed in the chapter. Identify these categories, describe them, and give transportation examples for each risk categories.
A football team's season ticket sales, percentage of games won, and number of active alumni for the years 1992-2000 are given below:
A researcher has reason to believe that, for an experiment with 50 points, a 95% prediction interval would be of width 4. If the researcher wishes to run a more precise experiment that will result in a 95% prediction interval of width 2, then the ..
In the linear programming formulation of the transportation problem, cost of transporting one unit of the material from a supply point to a demand point appears in
a trucking firm delivers appliances for a large retail operation. the packages or crates have a mean weight of 303 lb.
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