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1. Suppose you want an 85 percent confidence level. What value would you use to multiply the standard error of the mean?
2. Dr. Patton is a professor of English. Recently he counted the number of misspelled words in a group of student essays. For his class of 40 students, the mean number of misspelled words was 6.05 and the standard deviation 2.44 essay. Construct a 95 percent confidence interval for the mean of misspelled words in the population of student essays.
3.We want to estimate the population mean within 5, with a 99 % level of confidence. The population standard deviation is estimated to be 15. How large a sample is required?
A player of a video game is confronted with a series of opponents and has an 80% probability of defeating each one. Success with any opponent is independent of previous encounters. The player continues to confront opponents until defeated.
What is the numerical value of the sample proportion p^ ? The P-value is the probability of what event?
Based on these data, explain whether or not course attendance had any effect on determining of a restaurants violation of health code.
What size random sample should you take if you want to estimate the annual salary in the population with 99 percent confidence and a maximum margin of error of $250?
For given population of high school seniors, the schoolastic aptitude test (SAT) in mathemathics has mean score of 500 with the standard deviation of 100.
Let x be the random variable that denotes the net amount a playr wins by playing this lottery. Write the probablity distribution of x. Determine the mean and standard deviation of x. How will you interpret the values of the mean and standard devia..
Compute a 90 percent confidence interval for the difference among the two population proportions. The CEO of the company would like to find out if Canadians.
In some ways, ANOVA is like what communications engineers refer to as "signal-to-noise ratio". What could I possibly mean by that statement?
The average hourly wage of workers in a fast food restaurant is $5.85 with a standard deviation of $0.35. Assume that the distribution is normal.
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
A coin is flipped 5 times in a row. What is the probability that it will come up heads all 5 times? For the data in question above, calculate the Sum of Squares Error (SSE).
Conduct a 3-period moving average, an exponential smoothing forecasting using an alpha of .25, and a seasonal forecast with 3 seasons.
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