Mathematics, 30.11.2021 06:20 painespeach1849
Suppose that in 2017, 52% of U. S. households had only wireless telephone service (no landlines). Suppose that in 2021, 56% of a random sample of 100 U. S. households had only wireless telephone service.
1. Using the proportion from 2017, calculate the standard error. (Remember, in the modules this test covers, we usually use the earlier year's proportion as an estimate of this year's proportion when we are calculating the standard error.)
2. Does the data allow the use of a normal model for our calculations? Explain your reasoning.
3. In this part of the test, we'll go ahead and use a normal model, regardless of whether you got "yes" or "no" as your answer to part (b). Using a normal model, calculate the approximate 95% confidence interval for the percentage of all U. S. households in 2021 that have only wireless telephone service. Explain your reasoning.
Answers: 1
Mathematics, 21.06.2019 12:30
Mercury poisoning is dangerous overload of mercury within the body. a major source of mercury within the body, a major source of mercury poisoning is consuming fish that contain mercury. certain fish are more prone to having higher levels of mercury than others. the pie chart shows the distribution of four breeds of fish at a hatchery. the hatchery has approximately 6,000 fish. a biologist from the centers for disease control and prevention randomly test 5% of each breed of fish for mercury content. her findings are shown in the following table. based on the biologist's findings, if a single salmon is randomly selected from those that were tested, what is the probability that this particular fish would have a dangerous mercury level? a) 0.001 b) 0.004 c) 0.02 d) 0.08
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Mathematics, 21.06.2019 20:00
Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0
Answers: 2
Suppose that in 2017, 52% of U. S. households had only wireless telephone service (no landlines). Su...
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