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How much oil wells in a given field will ultimately produce is key information in deciding whether to drill more wells. Following are the estimated total amounts of oil recovered from 64 wells in the Devonian Richmond Dolomite area of the Michigan basin, in thousands of barrels. Take these wells to be a Simple Random Sample of wells in this area.
Construct a 95% confidence interval for the mean amount of oil recovered from all wells in this area using t procedures.
Make a histogram of the data and discuss the shape, center, and spread. A computer-intensive method that gives accurate confidence intervals without assuming any specific shape of the distribution gives a 95% confidence interval of 40.28 to 60.32. How does the t interval that you constructed compare with this interval? Should the t procedures be used with this data?
The mean lifetime of electric light bulbs produced by a company has in the past been 1120 hours with a standard deviation of 125 hours. A sample of 20 bulbs revealed a standard deviation in the lifetimes of 150 hours.
Expireall Corporation is in finishing business. The following data took place during September: The standard cost card indicates that 2.0 feet are used in the production of each unit. The standard cost of each material is $4.50 per foot.
Construct a 95% confidence interval for the population mean test score for high school seniors - difference between the fraction who preferred the incumbent and the fraction who preferred the challenger at the time of the survey.
A 2007 study reported in Science magazine stated that fifth-grade teachers scored a mean of 3.4 (out of 7) points for "providing evaluative feedback to students on their work." Assume that the sample size was 36 and the sample standard deviation w..
Chrysler Corporation agrees to allow you to randomly select 40 of its new Dodge Caravans to test the highway mileage. Chrysler claims that the caravans get 28mpg on the highway.
What is the probability that the participant was aged 20-40 or was influenced by ipad the most? What is the probability that the participants were influenced by ipod the most, given that the participants are aged under 20?
In particular, discuss whether there is enough information presented in the article to arrive at the same conclusion as reported."
Compute the test statistic. At 95% confidence using the p-value approach, test to see if taking the course actually increased scores on the driving exam.
When the necessary conditions are met, a two-tail test is being conducted to test the difference between two populations proportions.
The New York Times recently reported that 60% of college entrants into elite public and private colleges in the U.S. have parents that earn over $150,000/yr.
If we assume this is true, what is the probability that in a random sample of 700 undergraduate business students, 181 or more will major in accounting?
10 independent measurements were made of the pH level for both solutions, with the following data testing. Do the data disprove the scientist's claim? Use the 5% level of significance. What is the p-value?
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