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Conduct a study to examine the relationship between party affiliation and gender. You find the following:
Democrat Republican IndependentMale 52 65 20Female 88 52 35
Are sex and party affiliation related?
Report the appropriate null and research hypotheses and the critical value (alpha = 0.05). In addition, provide your statistical conclusion, including calculation of test statistic and what the data suggests in one to two sentences.
Create a histogram over five class intervals.
A study of the time spent shopping in a supermar- ket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be:
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10. The upper and lower control limits, respectively, for an:
It is believed that students who begin studying for final exams a week before the test score differently than students who wait until the night before. Suppose you want to test specifically that students who study earlier have an average score tha..
You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of H0. You calculate a p-value of 0.0667.
The manufacturer would like to establish Inventory levels such that there is only a 5% chance of running out of stock. Where the Manufacturer should set the inventory levels?
As a test the truck company purchases a random sample of metal parts from Steel-R-Us, and then determines if these parts were delivered on-time. Which hypotheses should they test?
In an experiment, subjects are required to generate a "yes" or "no" decision. The probability of 'Yes' being correct is 50%. The observed probability of yes decisions is 70%.
Items coming off a production line are categorized as good (G), slightly blemished (B), and defective (D), and the percentages are 80%, 15% and 5%, respectively.
The major shopping areas in community of Springdale include Springdale Mall, West Mall, and downtown area on Main Street. A telephone survey has been conducted to determine strengths and weaknesses of these areas and to find out how they fit in th..
What is the relationship between the sign of the correlation coefficient and the sign of the slope of the regression line?
Suppose a firm evaluates the productivity of the three shifts of workers who work in their factory. Each shift's performance is measured based on the amount of output that is produced during the shift - day, evening, or swing shift.
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