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USA Today ran a report about a UNC poll of 1248 adults from the southern U.S. It was reported that 8% of those surveyed believe that Elvis Presley still lives. The article began with the claim that
The decomposition approach to forecasting may be helpful when attempting to forecast a time-series. Could an analogous approach be used in a multiple regression analysis?
A study of religious practices among college students interviewed a sample of 245 students; 157 of whom stated they pray at least once in a while. Determine the sample proportion. Round your answer
Construct a 99 Confidence Interval for the mean time per day spent listening to music for those who actually replied. What sample size is necessary to make a 95% CI for those who replied? The margin o
Gigi and Ron are candidates for mayor in a city. You want to estimate the proportion of Gigi's voters with 90% confidence and a margin of error that is no greater than 3%. What is the smallest sampl
A study asked 1009 adults which causes of death they thought would likely become more common in the future. 70% stated that gun violence would increase. Give a 95% confidence interval for this surve
A simple random sample of 49 8th graders at a large suburban middle school indicated that 82% of them are involved with some type of after school activity. Find the 99% confidence interval that est
Assume the GPA of STAT230 students is distributed normally with a population standard deviation of 0.10. To test whether the average GPA of STATS II students is GREATER THAN 3.12, a sample size of 4
A sample of 500 Drivers was asked whether or not they speed while driving. The following tabel gives a two-way classification:
The average length of stay at a local hospital is 4.9 days. Assuming a population standard deviation of 3.5 days, what is the probability a random sample of 50 patients has an average stay of 5.2 da
Here are the golf scores (again) of 12 members of a college women's golf team in two rounds of tournament play. (A golf score is the number of strokes required to complete the course, so that low sc
A survery found that womens heights are normally distributed with mean of 62.1 and standard deviation of 2.3 in. The survery also found that men's heights are normally distributed with a mean of 68
In a recent health survey, 390 randomly selected college undergraduates were asked, "Regarding your current weight, do you feel that you're: 'About right', 'Overweight', or 'Underweight'?" A conting
Starting with the formula and substituting values for each variable, provide all the steps of the calculations to arrive at a z-score of +1.4. Show all steps of the calculations to arrive at a z-sco
Out of 87 observations, 67% were successes. Ho: p = 0.54. Confidence level: 98%. What is the value of the appropriate test statistic used to test the null hypothesis?
The National Assessment of Educational Progress (NAEP) periodally administers tests on different subjects to high school students. In 2000, the grade 12 students in the sample average 301 on the mat
A study was conducted by Enron Research to test for a difference inthe mean number of critical care patients in rooms at three area hospitals-Sentara, Inova, Winchester. The following shows the resu
270 randomly selected light bulbs were tested in a laboratory, 98 lasted more than 500 hours. Find a point estimate of the true proportion of all light bulbs that last more than 500 hours.
95 numbers are rounded off to the nearest integer and then summed. If the individual round-off error are uniformly distributed over (?.5,.5) what is the probability that the resultant sum differs fr
A certain enzyme in the liver of fish is considered an indicator of trace amounts of a dangerous pollutant that is difficult to detect by chemical methods.
Find the most powerful test with significance level alpha = 5% to test Ho: theta = 2 against Ha: theta = 1. How does the nature of the test statistic and rejection region for the most powerful test
If Z is a standard normal variable, what is the probability P(-0.73 < Z < 2.27)?
Suppose that the hypotheses H0:P=.35 and Ha:p>.35 are to be tested. Calculate the ovserved z-statistic for the sample data where forty our of eighty test subjects have the characteristic of inter
A researcher wishes to estimate, with 95% confidence, the proportion of adults who have high-speed internet access. Herestimate must be accurate within 1% of the true proportion.