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Physicians at a clinic gave what they thought were drugs to 940 patients. although the doctors later learned that the drugs were really placebos, 52% of the patients reported an improved condition.
Find the P value for the given test statistics
The average ACT score in Minnesota in 1986 was 19.4. Assuming a standard deviation of 2.0, find (approximate) the probability that the mean of a random sample of 25 scores from Minnesota exceeds 20.
Suppose you have a coin that lands on "heads" with probability p, 0 < p < 1. You don't know the value of p however. So you decide to run an experiment to get an estimate of p using the maximum
A coin was flipped 60 times and came up heads 36 times. What is the test statistic you would use to test whether the proportion of heads is greater than 0.50 at a 10% level of significance?
A student randomly guesses at 20 multiple choice questions. Each question has four possible answers with only one being correct, and each is independent of every other question.
Let p represent the proportion of all pike and trout that die (i.e., p is the mortality rate) when caught and released using barbless hooks. Find a point estimate for p.
In one study of smokers who tried to quit smoking with nicotine patch therapy, 39 were smoking one year after the treatment, and 31 were not smoking one year after the treatment.
Assume that the average weight of students, faculty, and staff on campus is 147 lb, that the standard deviation is 27 lb, and that the distribution of weights of individuals on campus is approximate
A normal population has a mean of 60 and a standard deviation of 11. You select a random sample of 9. Compute the probability the sample mean is : (a). Greater than 63. (b). Less than 57. (c). Betwe
The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days. Find the probability of a pregnancy lasting 308 days or longer.
If your ANOVA hypothesis test shows no interaction between two factors: Assume that there is no effect due to either of the factors on the response variable
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