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Assume that nothing is known about the percentage of computers with windows operating systems. Assume that a recent survey suggests that about 90% of computers use windows operating systems (based on
Assume that the 16 sample values appear to be from a normally distributed population and construct a 98% confidence interval estimate of the mean wake time for a poplulation with Zopiclone treatment
Use z scores to determine on which exam the student performed better relative to the other test takers. First exam or second exam
Fat contents (in percentage) for 10 randomly selected hot dogs were given in the article "Sensory and Mechanical Assessment of the Quality of Frankfurters". Use the following data to construct a 90%
If a sample of 1 can be drawn from an automatic storage and retrieval rack with 3 different storage racks and 4 different trays in each rack, what is the number of different ways of obtaining a tray
A deck of 52 cards is shuffled and a bridge hand of 13 cards is dealt out. Let X and Y denote, respectively, the number of aces and the number of spades in the hand.
To test for a disease that has a prevalence of 1 in 100 in a population, blood samples of 10 individuals are pooled and the pooled blood is then tested. What is the probability that the test result
In a representative sample of 1000 adult Americans, only 480 could name at least one justice who is currently serving on the U.S. Supreme Court. Using a significance level of 0.01,
A company is develoing a new golf ball. The overall distance is approximately normally distributed and has a standard deviation of 20 yards. Using a sample of n=10, the company would like to determi
Four balls are randomly placed, one at a time, into four urns (so that it is possible for more than one ball to be in any particular urn). Let the random variable X be the number of urns that are o
The following data represents the time it takes a company to respond to an account inquiry for opening a new account. Using the exponential distribution estimate the average waiting time using the sam
The following partial minitab printout of a regression analysis where x is the number of calories per serving and y is the number of grams of sugar per serving for a random sample of high-fiber cere
An advertisement for Cold-Ex claims an 40 percent end-of-treatment clinical success rate for the treatment of flu. 11 flu patients are given Cold-Ex and are later checked to see if the treatment was
Samples of the members of five different labor unions were asked whether they are for or against a certain piece of legislation:
The following data were collected for a test of linear correlation and Spearman's rank correlation was used:
What test is appropriate for this problem? State the null and alternate hypotheses Find the expected cell counts Find the test statistic How many degrees of freedom will you use? Find the critical v
Find the best predicted temperature at a time when a cricket chirps 3000 times in 1 minute. What is wrong with this predicted value?
A batch of 25 injection-molded parts contains five that have suffered excessive shrinkage. If two parts are selected at random, and without replacement, what is the probability that the second part
Is there convincing evidence that the majority of adult Americans prefer to watch movies at home? Test the relevant hypotheses using a 0.05 significance level. (For z give the answer to two decimal
200 draws are made with replacement from a box of numbered tickets. these tickets are labeled either -2 or3. is it possible for the expected value of the sum to be 50. justify your answer.
A fair six-sided die with numbers 1,2,3,4,5,6 is rolled independently 500 times. Approximate the probability that the sum is between 1720 and 1800.
A pearson's correlation coefficient of -.05 would represent a scatter plot in which:
A correlation coefficient has an associated probability value of .02 then;