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When people smoke, the nicotine they absorb is converted to cotinine, which can be measured through blood tests. A random sample of 40 smokers has a mean cotinine level of 172.5 ng/ml. Assuming that = 119.5 ng.ml, test the claim that the mean cotinine level of all smokers is equal to 200.0 ng/ml. Use a 0.05 significance level.
In a completely randomized experimental design, 18 experimental units were used for the first treatment, 10 experimental units were used for the second treatent, and 15 experimental unites were used for the first treatment.
Construct a frequency distribution of the sample mean, and plot a histogram of this distribution. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean.
Consider the following statement and discuss its implications. 'It is possible for a statistically significant result to be of no particular practical significance, depending on the context of the analysis.'
Due to large losses incurred in the past several years, a firm has $2 billion in tax-loss carryforwards. This means that the next $2 billion of the firm's income will be free from corporate income taxes.
A production process produces 90% non-defective parts. A sample of 10 parts from the production process is selected. What is the probability that the sample will contain 7 non-defective parts?
Why are estimations and confidence intervals important? Do confidence intervals and estimation play a role in the selection of sample size?
A jeweler at Tiffany & Company computes the value of the linear correlation coefficient for pairs of sample data consisting of Tiffany prices for gold wedding rings and the corresponding prices at a discount store.
The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones
A company is interested in evaluating its current inspection procedure on shipments of 20 identical items. They take a sample of 5 and accept the shipment if no more than the allowed maximum of the samples are found to be defective.
Compare the percentage found in b) to percentage given by Empirical Rule and Chebyshev's Rule. (Make a table 3 x 3).
The formula h(s) = -32s2 + 400s + 8 models a rocket's height, h, in feet, s seconds after launching. Find the height, h(s), five seconds after launch.
Compute the relative frequencies and percentages for all classes. Draw a histogram and a polygon for the relative frequency distribution.
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