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### Question #2011418: Confidence Intervals – Calculation

Question: An air pollution index (from 1 to 25, with 25 being the most serious pollution) takes into account the amount of carbon monoxide in the air. A random sample…

### Question #2016603: Hypothesis Testing

Question: Consider the following set of sample data: 78 121 143 88 110 107 62 122 130 95 78 139 89 135 Using Tchebysheff’s Theorem, determine the range of values…

### Question #2023356: Advanced Statistical Methods

Question: Run a factor analysis on the following data provided. Conduct a factor analysis with the fifteen items (effic 1 to effic15), request Univariate descriptive for the 15 variables, correlation…

### Question #2002780: T-test Hypothesis Testing

Question: The following data were obtained from an independent measures study. Determine if there is a significant difference between the treatments. Use ? = .01 Solution: The solution consists of…

### Question #2011443: Testing Hypothesis

Question: (10) Is it possible for an obtained t value to be significant at the 5% level of risk but not at the 1% level of risk? Explain and give…

### Question #2016627: Computing Confidence Intervals

Question: Please construct a confidence interval in the situation described below. You need to choose which Excel Worksheet to use (CI Sigma_Known.xls or CI_Sigma_Unknown.xls) and ex­plain your choice. A major…

### Question #2023374: Working with Confidence Intervals

Question: [1%] CONFIDENCE INTERVALS: A sample of 50 Hummer owners revealed that 40 have cut back on their driving due to the increased cost of gasoline. Give a 90% confidence…

### Question #2002806: T-test: Testing hypotheses

Question: The federal government recently granted funds for a special program designed to reduce crimes in high crime areas. A study of the results of the program in five high…

### Question #2011463: Other Statistics Problems

Question: If a distribution has a mean of 20 and a standard deviation of 5, what happens to the mean, variance, and standard deviation if we a. add the constant…