Reference no: EM13112930
1. A sample of seed packets was selected, and their weights in grams were recorded as follows: 15.1, 15.6, 15.8, 15.1, 15.5, 15.9, 15.5, 15.2. Determine a 90% confidence interval for the mean weight of seeds in all packets.
2. A manufacturer of passenger car tires claims that the lifetime of its tires is at least 30,000 miles. A consumer testing bureau tests this claim at a significance level of 1% with a sample of 45 tires. The sample statistics are as follows: the mean is 29,560,and the standard deviation is 1,430.What is the appropriate conclusion?
3. A car insurance company claims that the average annual rates of $1075 have not increased over the last three years. A sample of 18 customers showed a mean of $1735 and a standard deviation of $222. The test claim at a 5% significance level.
4. To determine whether the intake of a certain nutrient, in grams, is significantly less in one group than in another, samples were taken and the following statistics obtained: Group 1, x1 = 66.3, s1= 9.17, n1 = 15 and Group 2, x2 = 77.8, s2 = 11.34, n2 = 10. At a 1% significance level, do the data indicate that individuals in group 2 take in a greater amount of nutrient than those in group 1? Assume the criteria for using the pooled t-test are satisfied.
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Finding density of solids and liquids
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Compute the mass percent of cucl2
: The total mass of pure metals produced = 0.4684 grams. compute the mass percent of CuCl2, and AgNO3, FeCl3 in the original mixture.
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Explain why ordinary least squares solution is not unique
: Explain why the ordinary least squares solution is not unique. What can you say about the residuals of any of the solutions. Using the SVD of X, write a closed form expression for this limiting solution.
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Illustrate what would you do if manager is in industry
: Suppose you're a middle manager in an industry with about a thousand employees. You're negotiating a contract with a potentially very large customer whose representative has hinted that you could almost certainly be assured
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Confidence interval-testing of hypothesis
: A sample of seed packets was selected, and their weights in grams were recorded as follows: 15.1, 15.6, 15.8, 15.1, 15.5, 15.9, 15.5, 15.2. Determine a 90% confidence interval for the mean weight of seeds in all packets.
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What is found in the ocean water
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Determine the final temperature of the mixture
: A student has sample of HNO3 of 340 ml at 25 degrees celsius and add water of 110 ml at 95 degrees celsius then determine the final temperature of the mixture
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Question about solubility product
: If 200 mL of 0.300 M Cr(NO3)3(aq) is added to 100 mL of 4.0 × 10^-4 M NaF(aq) at 25 degrees celcius, will a CrF3 precipitate form? For CrF3 in water at 25°C, Ksp = 6.6 × 10^-11.
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Information about stats hw
: The table below lists deaths in Georgia in 2004, the estimated population of Georgia in 1994 and the U.S. population according to the 2000 census. Calculations should be done by hand, but feel free to use software to check your work.
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