Amedical researcher says that 25% of U.S. aduits are smokers. In a random sampie of 272US. adults, 57 say that they are smokers at a - 0.05, is there enoughevidence to support that less than 25% of U.S. adults are smokers?Cormpute the test statistics.21.23032-1.54032-1.54032-1.2303A Moving to the next question prevents changes to this answer.Question 7 of

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A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Statistics (UPVOTE WILL BE GIVEN. NO LONG EXPLANATION. CHOOSE THE CORRECT ANSWER.)
Suppose that a certain paper included the accompanying data on the tar level of cigarettes smoked for a sample of male smokers who died of lung cancer. Tar Level Frequency Low 108 Medium 383 High 568 Very high 155 Assume that the sample is representative of male smokers who die of lung cancer. Calculate the value of the ?2 test statistic that could be used to test whether the proportions of male smoker lung cancer deaths are not equal for all of the four tar level categories. The expected values are 303.5 for each of the four cells. (Round your answer to three decimal places.) ?2 =
6.1 Sexual harassment of college students. A survey of 2036 undergraduate college students aged 18 to 24 reports that 62% of college students say they have encountered some type of sexual harassment while at college.1 Describe the sample and the population for this setting 6.4 How often do they play? In the Pew survey described in Example 6.1, those who played video games were asked how often they played. In this subpopulation, 223 adults said that they played every day or almost every day 6.10 How often do they play? Refer to Exercise 6.4 (page 318). (a) Find SE^p, the standard error of ^p. (b) Give the 95% confidence interval for p in the form of estimate plus or minus the margin of error. (c) Give the confidence interval as an interval of percents.
Round up to the nearest integer for a-b.
2.17 Global warming: A research poll asked 1464 Americans "From what you've read and heard, is there solid evidence that the average temperature on earth has been getting warmer over the past few decades, or not?". The table below shows the distribution of responses by party and ideology, where the counts have been replaced with relative frequencies. Earth is warming Not warming Don't know (or refuse) Total Conservative Republican Mod/Lib Republican 0.08 0.08 0.05 0.21 0.07 0.02 0.09 0.18 Mod/Cons Democrat 0.15 0.01 0.06 0.22 Liberal Democrat 0.24 0.00 0.15 0.39 Total 0.54 0.11 0.35 1 a) Are believing that the earth is warming and being a liberal Democrat mutually exclusive? O mutually exclusive not mutually exclusive b) What is the probability that a randomly chosen respondent believes the earth is warming or is a liberal Democrat? (please round to four decimal places) c) What is the probability that a randomly chosen respondent believes the earth is warming given that they are a…
please answer e,f,g
Write the null and hypothesis for this test.
It currently takes users a mean of 2626 minutes to install the most popular computer program made by RodeTech, a software design company. After changes have been made to the program, the company executives want to know if the new mean is now different from 2626 minutes so that they can change their advertising accordingly. A simple random sample of 5151 new customers are asked to time how long it takes for them to install the software. The sample mean is 24.924.9 minutes with a standard deviation of 2.72.7 minutes. Perform a hypothesis test at the 0.0250.025 level of significance to see if the mean installation time has changed. Step 1 of 3 : State the null and alternative hypotheses for the test. Fill in the blank below. H0Ha: μ=26: μ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯26
In a recent poll six hundred adults were asked a series of questions about the state ofthe economy and their children’s future. One question was, “do you expect your children to have a better life than you have had, a worse life, or a life about the same asyours?” The responses showed 242 better, 310 worse, and 48 about the same. Use thesign test and a =.05 to determine whether there is a difference between the number ofadults who feel their children will have a better life compared to a worse life. What isyour conclusion?
help
2.2 According to Watch Corporation, its watches usually gain or lose time over the course of a week. The following weekly gains (+) or losses (-) in seconds were recorded by a sample of 18 watches. -0.38 -0.20 -0.38 -0.32 -0.37 -0.61 -0.48 -0.47 Your answer +0.32 -0.64 -0.23 +0.30 -0.04 -0.20 Your answer +0.25 -0.68 State the null and the alternate hypotheses whether the mean gain or loss in time for the watches is 0 or not? -0.10 +0.05 By from 2.2 Is it reasonable to conclude that the mean gain or loss in time for the watches is 0? Use the .05 significance level. How do you know that?
A 2010 Pew Research poll asked 1,306 Americans "From what you've read and heard, is there solid evidence that the average temperature on earth has been getting warmer over the past few decades, or not?". The table below shows the distribution of responses by party and ideology, where the counts have been replaced with relative frequencies. Earth is warming Not warming Don't know (or refuse) Total Conservative Republican 0.11 0.2 0.02 0.33 Mod/Lib Republican 0.06 0.06 0.01 0.13 Mod/Cons Democrat 0.25 0.07 0.02 0.34 Liberal Democrat 0.18 0.01 0.01 0.2 Total 0.6 0.34 0.06 1 a) Are believing that the earth is warming and being a liberal Democrat mutually exclusive? not mutually exclusive mutually exclusive Incorrect b) What is the probability that a randomly chosen respondent believes the earth is warming or is a liberal Democrat? (please round to four decimal places)c) What is the probability that a randomly chosen respondent believes the earth is warming given…

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