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A scientist counts the number of inclusions in a sample of 30 tourmaline rocks, each of weight 50g.
(a) If the sample mean number of inclusions per gem is 39.7537 and the sample standard deviation of the number of inclusions is 3.6371, calculate the standard error of the mean number of inclusions.
(b) Provide a 95% confidence interval for the mean number of inclusions per tourmaline gem (answer to 4 decimal places).
What percentage of students from this school earn scores that satisfy the admission requirement?
a company sells lamps of which 15 are defective.a what is the probability that in a box of 14 lamps there will be at
Because patients had to consent to participate in this experiment, the subjects were essentially selfselected a kind of voluntary response group. Explain why that does not invalidate the findings of the experiment.
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
Children on average collect 35 pieces of candy on Halloween. Halloween 2015 you sample 40 children and count their candy bags. Assume a normal distribution with a standard deviation of 5 pieces. What is the probability that: The sample mean is 36 ..
How is the conclusion affected by the fact that Internet users who saw the question could decide whether to?respond?
Write the following compound statements in symbolic form, then use your knowledge of the historical events referred to by the simple statements to determine the truth value of the compound statements.- Edison invented the telephone, or Custer was ..
What is the standard deviation of following scores. There are 31 scores and need standard deviation for sample.
Weights are distributed normal with a mean of 132 pounds and a standard deviation of 27.4 pounds. In a random sample of 150, how many of them would be expected to weigh between 100 and 115 pounds?
Suppose that a survey is being planned for purposes of estimating the average number of hours spent exercising daily by adults (18 years of age or older) living in a certain community.
What percent of horse pregnancies are longer than 339 days?
Neckwarmers. Mountainside Fleece sold 40 Neckwarmers. Solid-color neckwarmers sold for $9.90 each and print ones sold for $12.75 each.
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