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The breaking strength of threads has a standard deviation of 18 grams. How many measures on breaking strength should be used in the next experiment if the estimate of the mean breaking strength is to be within 4 grams of the true mean breaking strength, with confidence coefficient 0.9?
What is the point estimate for the proportion of people preferring model B, write suitable null and alternative hypotheses in words and symbols for this problem.
how much money can be withdrawn at the end of 21 years if 6000 is deposited at the end of each year for 14 years and no
To demonstrate the process is in control or out of control utilizing p-chart. A company which produces nails has retained you as a consultant.
the mean and the standard deviation of the sample of 100 bank customer waiting times in table 1.8 are xbar5.49 and
in a combined study of northern pike cutthroat trout rainbow trout and lake trout it was found that 26 out of 855 fish
the following data were obtained from a survey of college students. the variablenbspxrepresents the number of
Based on these results, does te diet appear to be effective? Does the diet appear to have practical significance?
A hypothesis will test that two population means are equal. A sample of 10 with a standard deviation of 3 is selected from the first population and a sample of 15 with a standard deviation of 8 from the second population.
intelligence tests are designed to provide a normal distribution of iq scores with a mean of 100 and a standard
Over many years of administering tests to my statistics students I have found that the overall average of the scores on the first exam that I give each semester is 76.
the amount of cola in a 12-ounce can is uniformly distributed between 11.96 ounces and 12.05 ounces.a. what is the mean
An exam consists of 10 true or false questions. If a student guesses at every answer, what is the probability that he or she will answer exactly six questions correctly? (Round the answer to three decimal places)
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