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An import-export firm has a 0.45 chance of concluding a deal to export agricultural equipment to a developing nation if a major competitor does not bid for the contract, and a 0.25 probability of concluding the deal if the competitor does bid it. It is estimated that the competitor will submit a bid for the contract with probability 0.40. What is the probability of getting the deal?
In a random sample of 328 florida public school employees, 231 were female. write a 95% confidence interval for the proportion of the population of florida public school employees that are female.
a. Formulate the null and alternative hypotheses. b. Which statistical test would you use? Why?
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
Discuss the advantages of non-parametric methods. As an educator, how would they be useful to you? In what situations would you use them?
A survey of 400 persons showed that 54.3% were in favor of product A. Test whether a majority were in favor of product A using a .05 significance level
Assume that the random sample of 200 light bulbs has mean life of 635 hours and standard deviation of 48 hours. Before applying Empirical Rule, what suppositions requires to be made about distribution of lifetimes of light bulbs?
Both days have sample standard deviations of 3.4. Is the average mean of size different from day 1 to day 2?
Test the claim of the brewery about the mean volume equal to 32 oz. at the 0.05 significance level. It's your choice whether to use z or t.
What is the relationship between the value for degrees of freedom and the shape of the t distribution? What happens to the critical value of t for a particular alpha level of df increases in value?
Comparing the results from (a) and (e), what happens to the required sample size when we increase the confidence level?
In studies examining the effect of humour on interpersonal attraction, McGee and Shevlin (2009) found that an individual's sense of humor had a significant effect on how the individual was perceived by others.
Years to Complete a Graduate Program: The average number of years a person takes to complete a graduate degree program is 3. The standard deviation is 4 months. Assume the variable is normally distributed. If an individual enrolls in the program, ..
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