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The following data represents the amount of time ( in minutes ) that a person had to wait for a bus to work on a random sample of 5 working days.
6--8--5--7--5
Assume that waiting times are approximately normally distributed.
Construct a 98% confidence interval for the population mean of waiting times.
Madison Metals recently reported $9,000 of sales, $6,000 of operating costs other than depreciation, and $1,500 of depreciation. The company had no amortization charges and no non-operating income.
Three times each year, the procurement manager at Phoenix contacts National\'s marketing department to place a monthly order for each of the coming four months.
If we select a crew member at random, what is the probability the crew member earns:
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
Determine the point estimate? Give the symbol and value.
The number of degrees of freedom for the appropriate chi-square distribution in a test of independence is:
Your younger brother comes home one day after taking a science test. He says that someone at school told him that "60% of the students in the class scored above the median test grade." What is wrong with this statement? What if he said "60% of the..
Explain the effect outliers can have on the analysis of the center of this data set. Based on the box-plot and histogram you created for problem 1, do there appear to be any outliers?
What sample size would be needed to obtain an error of +/- 10 square millimeters with 99% confidence?
The assembly time for a product is uniformly distributed between 6 to 10 minutes.
What is the probability that between 5 and 10 firms, inclusively, purchase a Unix machine from Sun Microsystems?
The weight of the first orange minus the weight of the second orange) is a random variable with standard deviation and individual outcomes are uncertain but happen in a predictable manner through time.
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