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Suppose that n=275 numerical entries were drawn at random from a large accounting file of a major corporation. The first nonzero digits were recorded for the example.
First nonzero digit 1 2 3 4 5 6 7 8 9Sample frequency 83 49 32 22 25 18 13 17 16
Use a 1% level of significance to test the claim that the distribution of first nonzero digits in the account file does not follow Benford's Law. (In other words, is there an indication of accounting fraud?)
A four-year university has decided to implement new approach to teaching Statistics. Full-time and adjunct professors were surveyed to determine whether they preferred the traditional lecture approach or a computer approach to teaching Statistics.
The January 17, 1994 issue of Time magazine reported that 58% of adult Americans said yes to the question "If you or your spouse were pregnant, would you want the unborn child tested for genetic defects?"
For many years TV executives used the guideline that 30 percent of the audience were watching each of the prime-time networks and 10 percent were watching cable stations on a weekday night.
What are the assumptions of regression analysis and how do you evaluate them?
What proportion of 330 cci cars fall between 26 to 30 miles per gallon range? Compute the percentage of each of the car models that get 30 or more mpg.
Set up hypothesis and two-tailed decision rule for right mean using 5% level of significance. Hypothesis for a two-tailed decision is?
Compute a 95% confidence interval for the population proportion of positive drug tests. Explain why is the normality assumption not a problem despite the very small value of p.
Debit card purchases are for more than $50. Ms. Tina Stevens just purchased a new dress that cost $120. What is the probability that she paid cash or check?
The odds of the Dallas Cowboys winning this year's Super Bowl are 3 to 1. Compute the probability of the Cowboys winning
Based on your answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
The average age for the individuals in the sample is M=48.9 years. How likely is it to obtain a random sample of n=16 jurors with an average age greater than or equal to 48.9?
What is the margin of error? What is the 95% confidence interval for the proportion of the population of employees who strongly dislike their current work experience?
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