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A large internet retailer is studying the lead time (elapsed time between the time when the order is placed and the time it is filed). The table below gives the lead times (in days) for a random sample of recent orders.
14 19 5 13 20 15 9 16
20 9 2 10 7 12 18 24
1 8 11 5 13 6 2 11
16 20 18 2 4 10 22 17
13 10 21 12 23 18 10 3
1. Display the above data in a group frequency distribution using five (5) classes of equal width.
2. With the aid of an appropriate, graph drawn to scale, determine the mean, the 80% percentile and the mid-50% range.
3. Calculate the standard deviation and hence estimate the CV using the mean obtained in 1.2. Interpret your result.
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
Find out the finite population correction (FPC).With a population size of 1,000 and a planned sample size of 200, what is the finite population correction.
The mean return for the random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Test the null hypothesis: H0: mu = 15% at α = 0.05.
Which of the following would have a binomial distribution and evaluate the binomial coefficient
Given what you've learned in this module about the meaning of "statistics", choose one of the examples from Part I (A-F), and raise a relevant question of your own that could be answered by a statistician.
Given that the mean of all 102 atomic numbers is 51.794, and the population standard deviation is 29.804, what is the probability that the mean of the 40 atomic numbers selected by the student will be at least 57.3?
A researcher wishes to forcast the proportion of fish in a perticular lake which is inedible due to pollution of the lake.
How does multilinear regression analysis apply to your profession? Specify the dependent value and the set of predictors. Where would you get the data?
Write a paragraph summarizing the results of the analysis and determine whether the calculated values of chi-square are statistically significant
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
If possible, determine a 95% confidence interval for average number of television sets in all 50,000 households. If this is not possible, describe why not.
what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey
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