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A sample of 500 evening students revealed that their annual incomes were normally distributed with the mean income of $30,000 and standard deviation of $3,000. Determine the income which separates top 25% from lower 75% of incomes?
The number of widgets produced by 9 employees in an eight hour shift is recorded below. Find the mean number of widgets produced.
Using a critical value, test hypothesis at the 1% level of significance.
Explain whether the authors used a population or a sample. Explain how this could have affected the results. If a sample was used, was it representative of the entire population? Why or why not?
Describe a study you might design that could use the Chi Square statistic. What are the variables? What are the null and alternative hypotheses? Why would the Chi Square test be appropriate for this design?
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
Using the appropriate statistical procedure on the SPSS, test the between group means for a significant difference.
Is there a relationship between sales and newspaper advertising? Support your answer?
Scores on a test are normally distributed with a mean of 60.9 and a standard deviation of 12. Find P81, which separates the bottom 81% from the top 19%.
The following payoff matrix has been developed for the decision problem. What is the opportunity loss when "A" is Investment alternative and "Decline" is state of nature?
If Household is selected at random, find out the probability that it feels economic conditions are good?
In this table, my research is about the average amount of money people expect to spend on attomeys when they are injured. Is there a difference, depending on type of injury? Do people expect to spend more when the injury happened in a car, on job,..
Determine the mode for this distribution. Describe why you can't calculate the mean number of times using data in the table.
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