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- The null and alternative hypothesis
- Type I and Type II errors
- The proper use of statistical software
- Cross-tabulation
- Chi-Square
- Single sample t
- Independent t
- One-Way ANOVA
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In a transportation problem with 5 supply points, 3 demand points, and total supply equaling total demand, the number of decision variables will be:
A doctor believes that the variance of systolic blood pressure is 470. A random sample of 20 patients found a variance of 525. What is the smaller critical value that would be used in a hypothesis test at a .05 significance level?
Explain the purpose of the chi-square test for independence. Provide some practical examples where this test might be used in business.
A random sample of eight adults aged 30 years were asked how much they spent on medical costs in the year 2011. The following data were measured. Compute the sample standard deviation.
According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy and electronically file a 1040 tax form. This distribution of times follows the normal distribution and the standard deviation is 80 minutes.
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
Of the next 15 people that invest in this project, what is the probability that 5 or less people will result an annual net cash flow of at least $100,000.
A psychologist wants to determine if there is a linear relationship between the number of hours a person goes without sleep and the number of mistakes he/she makes on a simple test. The following data is recorded. Determine the regression line equ..
a. Is there evidence the mean amount is different from 1.0 gallon (alpha= 0.01)? b. Compute the p-value and interpret its meaning. c. construct a 99% confidence interval estimate of the population mean amount of paint.
In some ways, ANOVA is like what communications engineers refer to as "signal-to-noise ratio". What could I possibly mean by that statement?
Jolly Blue Giant Health Insurance is concerned about rising lab test costs and would like to know. Determine the essential sample size?
What are post hoc comparisons, and why do researchers make them? Why do researchers not use the Bonferroni procedure of procedures for post hoc comparisons?
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