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The accompanying data on number of minutes used for cell phone cans in one month was generated to be consistent with summary statistics published in a report of a marketing study of San Diego residents
189 0 189 177 106 201 0 212 0 306
0 0 59 224 0 189 142 83 71 165
236 0 142 236 130
a. Would you recommend the mean or the median as a mantis of comer for this data set? Give a brief explanation of your choice. (Hint: It may help to look at a graphical display of the data.)
b. Compute a trimmed mean by deleting the three smallest observations and the three largest observations in the data set and then averaging the remaining 19 observation. What is the trimming percentage for this trimmed mean?
c. What trimming percentage would you need to use in order to delete all of the 0 minute values from the data set? Would you recommend a trimmed mean with this trimming percentage? Explain why or why not.
Given that the mean of 100 observations is 42.5 and that their standard deviation is 6.313, find the sum of the squares of the observations.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Complete the ANOVA summary table for simple linear regression. -Conduct an F test for a significant regression and find bounds on the p value associated with this test.
We also assume that the population values are approximately normally distributed. Find the UPPER confidence limit for a 99% confidence interval for µ.
Is x a discrete or continuous random variable? Explain. What are the possible values that x can assume?
describe a scenario where you believe a binomial distribution would be appropriate. describe a scenario where you
Explain the history behind the Black Soldier of the Civil War. In this forum look beyond the book for information on specific units, soldiers and even the reasons for why Lincoln allowed the African American to service in the war.
As you learned earlier, project managers are expected by customers and stakeholders to deliver a definitive and functional cost estimate in a timely manner.
Say that you know that the average amount of milk that American kids drink is 9 ounces per day with a standard deviation of 3. A researcher thinks that children raised on farms will drink more milk on average due to the availability of fresh milk..
Review of straight lines. During the period after birth, a male white rat gains exactly 40 grams (g) per week.
In the long run, what proportion of the group will be (i) Easterners, (ii) Westerners, (iii) will move from East to West in a given year, (iv) will move
Pearson Correlation cannot be used to identify non-linear relationships between two variables.
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