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A school administrator says that standard deviation of test scores for eighth grade students who took a life science assessment test is less than 30. You work for the administrator and are asked to
A recent poll found that 30% of those surveyed are worried regarding aggressive drivers upon the road. If three people are selected at random, that is the probability that all three will be worried
A study was carried out to determine if curing temperature significantly affects tensile strength of silicone rubber. An axially controlled automated hydraulic force applicator was employed to measu
A magazine reports that 5% of U.S. adults say they have seen extraterrestrial being. You decide to test this claim, and ask random sample of 250 U.S. adults whether they have ever seen an extraterres
The random walk model employed to describe gas diffusion can be treated as a binomial distribution similar to coin flips with a 50/50 chance that a particle will move in either the +x or the -x dire
Can someone explain how regression can be used to make predicitions when applying statistics to real-world decisions?
A statistics teacher recently adopted the new textbook. At completion of course, 100 randomly chosen students were asked to measure the book. The results showed:
The powerball lottery consists of selecting five numbers (1-56) and a powerball number (1-46). What are the odds of selecting the correct set of six numbers with one ticket?
In a study of atmospheric concentrations of air pollutants in Los Angeles area, daily measurements of seven pollution-related variables were recorded over extended period of time.
An oil company conducts a geological study which points out that an exploratory oil well should have a 20% chance of striking oil. What is the probability that the first strike comes on the third we
Find out a single sampling plan with inspection level II, for an AQL = 1% and a lot size N=1,000 production units under:
In the United States there is strong relationship between smoking and education with well-educated people less likely to smoke. A study in France included a sample of 459 men who were selected at ra
Comment on the kind of relation which appears to exist between number of carats and the price, based upon the scatter diagram and linear correlation coefficient.
Assume that we would like to calculate a 99% confidence interval for unknown mean range, µ, of bats using the data in.
A paired-difference experiment dealing with the response latencies for noise detection under two conditions used a sample of twelve 9-month-old children and reported a sample mean difference of 70.1
Provide a point estimate of true proportion of people in population who are against all forms of legalized gambling. Develop an approximate 90% CI for true proportion of people in population who are a
Assume you're given data from survey showing the IQ of each person interviewed and IQ of his or her mother. That is all the information you have. Your boss has asked you to put together report showi
Test at the 1% level the null hypothesis that population proportions are equal against the alternative that the higher proportion of French have a positive attitude towards car salesmen.
Assume that the mean score on this test is 75.6 with standard deviation of 7.8. Assume also that the scores follow bell-shaped distribution.
Suppose that we observe a random variable having the binomial distribution. Let X be the number of successes in n trials.
Assume that the mean on this test is 75.6 with standard deviation of 7.8. Assume also that the scores follow the bell shaped distribution.
A random sample of 100 felony trials showed a sample mean waiting time between arrest and trial = 173 days with a population standard deviation of waiting times = 28 days. Find a 99 percent confiden
A random sample of 19 rainbow trout caught at Brainard Lake, Colorado had mean length sample mean= 11.9 inches with a standard deviation s=2.8 inches.
The joint pmf of a bivariate r.v.(X,Y) is given by Pxy (xi,yj) = k(2xi + yj) xi= 1,2 ; yj =1,2
Suppose that the z scores are normally distributed with mean of 0 and a standard deviation of 1.