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a survey of 490 citizens found that 314 of them

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Get college assignment help at Smashing Essays Question a survey of 490 citizens found that 314 of them favor a new bill, there is a 95% confidence interval for the true proportion of the population who favor the bill, what is the lower limit of the interval?really have been working on this problem for a while. really has me stomped.

The following data were obtained in four group studyGroup 1:

Question The following data were obtained in four group studyGroup 1: 6 5 7 5 3 4Group 2: 6 9 9 4 5 6Group 3: 3 7 6 3 4 7Group 4: 5 3 1 4 3 5 (a) Are the four group means significantly different from each other?(b) Suppose all pairwise comparisons  were investigated. If the        αΣ is maintained at the level of 0.05, is the difference between the means of groups 2 and 4 significant?(c) Use the SNK method to test all pairwise contrasts. Consider the per comparison error rate α = 0.05. Does the result agree for the difference between the means of groups 2 and 4 with the result in (b).

Data collected on the number of passengers on charter fishing

Question Data collected on the number of passengers on charter fishing boats range from 0 to 14 and follow a uniform distribution. Using properties of a uniform distribution, what proportion of charger fishing boats contain between 2 and 9 passengers?

There is often the requirement to evaluate descriptive statistics for

Question There is often the requirement to evaluate descriptive statistics for data within the organization or for health care information. Every year the National Cancer Institute collects and publishes data based on patient demographics. Understanding differences between the groups based upon the collected data often informs health care professionals towards research, treatment options, or patient education.Using the data on the “National Cancer Institute Data” Excel spreadsheet, calculate the descriptive statistics indicated below for each of the Race/Ethnicity groups. Refer to your textbook and the Topic Materials, as needed, for assistance in with creating Excel formulas.Provide the following descriptive statistics:Measures of Central Tendency: Mean, Median, and ModeMeasures of Variation: Variance, Standard Deviation, and Range (a formula is not needed for Range).Once the data is calculated, provide word analysis of the descriptive statistics on the spreadsheet. This should include differences and health outcomes between groups.. Attachment 1 Attachment 2 ATTACHMENT PREVIEW Download attachment Capture #1.PNG ATTACHMENT PREVIEW Download attachment Capture #2.PNG

Suppose that 283 out of a random sample of 350

Question Suppose that 283 out of a random sample of 350 letters mailed in the United States were delivered the day after they were mailed. Based on this, compute a 95% confidence interval for the proportion of all letters mailed in the United States that were delivered the day after they were mailed. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. What is the lower limit of the 95% confidence interval?What is the upper limit of the 95% confidence interval?

The conditions for using the T-Interval are: (Check all that

Question The conditions for using the T-Interval are: (Check all that apply)When estimating the population mean, μ with confidencensigma is knownpopulation is approximately normaln ≥30sigma is unknown

Briefly explain the advantage of using an alpha level (α)

Question Briefly explain the advantage of using an alpha level (α) = .01 versus an α = .05. In general, what is the disadvantage of using a smaller alpha level? 

Discuss the errors that can be made in hypothesis testing.

Question Discuss the errors that can be made in hypothesis testing. a. What is a type I error? Why might it occur? b. What is a type II error? How does it happen? 

In the Health ABC Study, 529 subjects owned a pet

Question In the Health ABC Study, 529 subjects owned a pet and 1972 subjects did not. Among the pet owners, there were 306 women; 964 of the non-pet owners were women. Find the proportion of pet owners who were women. Do the same for the non-pet owners. (Be sure to let Population 1 correspond to the group with the higher proportion so that the difference will be positive. Round your answers to three decimal places.)p̂1= p̂2= Give a 95% confidence interval for the difference in the two proportions. (Do not use rounded values. Round your final answers to three decimal places.)   ,  

The term error is used in two different ways in

Question The term error is used in two different ways in the context of a hypothesis test. First, there is the concept of standard error (i.e. average sampling error), and second, there is the concept of a Type I error. a. What factor can a researcher control that will reduce the risk of a Type I error? b. What factor can a researcher control that will reduce the standard error?

Which of the following changes would cause a confidence interval

Get college assignment help at Smashing Essays Question Which of the following changes would cause a confidence interval for the population mean to be wider? (5 points)a. A larger probability content and a smaller variance.b. A larger sample mean.c. A smaller alpha .d. Smaller variance and larger alpha.e. A larger sample size.

A survey of Internet users reported that 22% style=”color:rgb(0,0,0);”> downloaded

Question A survey of Internet users reported that 22% style=”color:rgb(0,0,0);”> downloaded music onto their computers. The filing of lawsuits by the recording industry may be a reason why this percent has decreased from the estimate of 29% from a survey taken two years before. Assume that the sample sizes are both 1391. Using a significance test, evaluate whether or not there has been a change in the percent of Internet users who download music. Provide all details for the test. (Round your value for z to two decimal places. Round your P-value to four decimal places.)z=P-value=We conclude that the proportions are not different.We cannot draw any conclusions using a significance test for this data.We conclude that the means are not different.We conclude that the proportions are different.We conclude that the means are different.Also report a 95% confidence interval for the difference in proportions. (Round your answers to four decimal places.)  ,  Explain what information is provided in the interval that is not in the significance test results.The interval shows no significant change in music downloads.The interval gives us an idea of how large the difference is between the first survey and the second survey.The interval does not provide any more information than the significance test would tell us.The significance test does not indicate the direction of change, but the interval shows that the music downloads decreased.The interval tells us there was a significant change in music downloads, but the test statistic is inconclusive.

The range for January is approximately: ?The IQR for January

Question The range for January is approximately: ?The IQR for January is approximately: ? /> ATTACHMENT PREVIEW Download attachment FigureD – corn yeild.png

A survey of Internet users reported that 17% style=”color:rgb(0,0,0);”> downloaded

Question A survey of Internet users reported that 17% style=”color:rgb(0,0,0);”> downloaded music onto their computers. The filing of lawsuits by the recording industry may be a reason why this percent has decreased from the estimate of 25% from a survey taken two years before. Suppose we are not exactly sure about the sizes of the samples. Perform the calculations for the significance tests and 95% confidence intervals under each of the following assumptions. ( Round your test statistics to two decimal places and your confidence intervals to four decimal places.)(i) Both sample sizes are 1000.z = 95% C.I.     ,  (ii) Both sample sizes are 1600.z = 95% C.I.     ,  (iii) The sample size for the survey reporting 25% is 1000 and the sample size for the survey reporting 17% is 1600.z = 95% C.I.     ,  Summarize the effects of the sample sizes on the results.We see in (i) and (ii) that smaller samples result in larger z (stronger evidence) and narrower intervals, while larger samples have the reverse effect. The results of (iii) show that the effect of varying unequal sample sizes is more complicated.We see in (i) and (ii) that smaller samples result in smaller z (weaker evidence) and narrower intervals, while larger samples have the reverse effect. The results of (iii) show that the effect of varying unequal sample sizes is more complicated.    We see in (i) and (ii) that smaller samples result in larger z (weaker evidence) and smaller intervals, while larger samples have the reverse effect. The results of (iii) show that the effect of varying unequal sample sizes is more complicated.We see in (i) and (ii) that smaller samples result in smaller z (weaker evidence) and wider intervals, while larger samples have the reverse effect. The results of (iii) show that the effect of varying unequal sample sizes is more complicated.We see in (i) and (ii) that smaller samples result in smaller z (stronger evidence) and wider intervals, while larger samples have the reverse effect. The results of (iii) show that the effect of varying unequal sample sizes is more complicated.

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A study on stress for college students reported a mean

Question A study on stress for college students reported a mean stress level of 71 with a margin or error of 6 for 95 % confidence. The study was based on a random sample of 81 students. 1.) Give the 95% confidence level. ______________ and _______________ 2.) If you wanted 99% confidence for the same studay , would the margin or error be greatern than , =, or less than 6?__________

A botanist is studying a newly identified soybean disease. The

Question A botanist is studying a newly identified soybean disease. The botanist collected soil samples from all of the soybean fields in randomly selected states to see if there were significant differences the sulfur levels in fields with and without the disease. 

Christianity being the largest population among western religions in the

Question Christianity being the largest population among western religions in the United States. In addition, there are a number of denominations represented across the country. Select one different position among two denomintions and explain the difference between the denominations (e.g., baptism between catholicism and evangelical, other issues may include but are not limited to: communion, priesthood, sacraments, biblical inerrancy).

A random sample of 25 workers showed that the average

Question A random sample of 25 workers showed that the average workweek in the United States is down to only 35 hours, largely because of a rise in part-time workers. The variance of the sample was 18.49 hours. Assuming that the population is normally distributed, calculate a 98% confidence interval for the population standard deviation.

A small college has an entering freshmen class of 600

Question A small college has an entering freshmen class of 600 students. Of these, 240 have brought their own personal computers to campus. A random sample of 110 entering freshmen was taken. What is the probability that the sample proportion of freshman students who brought their own personal computers to campus is between .42 and .46?

Students across the U.S. take the ACT test, which has

Question  Students across the U.S. take the ACT test, which has scores that are normally distributed with a mean of 21 with a standard deviation of 5. If 250 students are randomly selected, what is the probability that at least 15 of them will score a 29 or better?

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