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A research company has designed three different systems to clean up oil spills. The following table contains the results, measured by how much surface area (in square meters) is cleared in 1 hour. The data were found by testing each method in several trials. Are the three systems equally effective.
You take a random sample and perform a hypothesis test, getting a p-value of 0.2578. What is the appropriate conclusion? Conclude at the 5% level of significance.
Internal study by Technology Services department at Lahey Electronics disclosed company employees get the average of 2 emails per hour. Suppose arrival of these emails is approximated by Poisson distribution.
What does the coefficient of determination tell you about the variation attendance and the variation in the number of exhibitors?
Which of the following Venn diagrams has shaded the event that the contractor wins exactly one of the contracts and evaluate the mean time to complete the entire homework assignment
As of 2012, the proportion of students who use a MacBook as their primary computer is 0.36. You believe that at your university the proportion is actually greater than 0.36. If you conduct a hypothesis test, what will the null and alternative hypo..
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
A study of 36 members of the Central Park Walkers showed that they could walk at an average rate of 2.6 miles per hour. The sample standard deviation is 0.4. Find the 95% confidence interval for the mean for all walkers.
Confirm that these statements are accurate by finding the geometric mean rate of increase.
An electronic circuit board fails randomly with failure rate of λ=0.00021 /h. When it fails it is replaced by a new board.
Hours worked is important predictor of amount of sales.
Results were analyzed using one -way ANOVA and included SSTR =7 , 102 and SSE = 10 ,511. Are all 8 tapes equally appealing on average? Determine p value?
Simulate 50 observations from a normal distribution with mean 0 and standard deviation 1. make a normal plot.
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