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The lifetime for a certain brand of incandescent light bulbs is normally distributed. A consumer group complains that the mean lifetime of this brand of incandescent light bulbs is no more than 500 hours. A random sample of five of these light bulbs had a mean lifetime of 520 hours and standard deviation of 50 hours. Perform the test of hypothesis at the α = .10 level of significance.
Assuming the supplier's claim is true, compute the mean and the standard deviation of the number of defective DVDs in the sample.
if thetahat is an unbiased estimator of the parameter theta and varthetahat goes to 0 as n goes to infinity then
If the probability of an event E occurring is P(E), what are the odds in favor of E occurring?
Write all the possible samples of size 2 and calculate the average or median of each one.
Kids again. Find the standard deviation of the number of children the couple in Exercise may have.
The probability of selecting each of the roads are the same. It is 1/3. If the prisoner succeeds on her escape, what is the probability that she made good on her escape by using road b.
a sample of 25 novels has a standard deviation of 9 pages. find the 95 confidence interval of the population standard
past experience shows that ever new book by a certain publisher captures between 4 and 12 of the market. what is the
The other group sees the second version and 30 of 70 people say that it is disturbing. Test the hypothesis that the two probabilities are equal, using α = .05 and compute a .95 confidence interval.
Draw the general graph of a left-tailed test ? Draw the graph of a two-tailed test? A bottle of water is labeled as containing 16 fluid ounces of water.
Discuss the burden placed on people or organizations contacted as references for job candidates. How do organizations cope with this burden?
suppose iq scores were obtained from randomly selected twins. for 20 such pairs of people the linear corelation
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