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The addition of a new accelerator is claimed to decrease the drying time of latex paint by more than 4%. Several test samples were conducted with the following percentage decrease in drying time. Assume that the percentage decrease in drying time is normally distributed.
5.4 6.6 3.7 6.0 3.1 2.0 2.7 4.2
(a) Find the 95% confidence interval for the true mean decrease in the drying time based on this sample. (Give your answers correct to two decimal places.)
Discuss how a t test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students.
The Queen Mary sails between England and the U.S. Stowaways are sometimes found on board. The ages (years) of stowaways from eastbound and westbound crossings are given below. Eastbound: 24, 24, 34, 15, 19, 22, 18, 20, 20, 17 Westbound: 41, 24, 32..
Four movies are randomly selected. Their lenghts were 110, 96, 125, and 136 minutes. Find a 95% confidence interval of the average of the lenghs of the movie.
Professor wishes to determine whether prior statistical knowledge assists students in their performance on the final exam. What is the relationship between pretest scores and final exam scores after controlling for cumulative GPA. What SPSS test w..
consider two random variables x and y. suppose that the variance of x is 20 that this of y is 10 and that the
Assuming the distribution of the salaries is normal, what is the probability that the average for this sample is between $36,000 and $42,000?
Number of rescue calls received by rescue squad in city follows a Poisson distribution with mu = 2.83 per day. Squad can handle at most four calls a day. Determine the probability that squad will be able to handle all calls on a particular day?
A document claims that 56.5% of UVA undergraduates are female. To test this claim, a random sample of 240 UVA undergraduates was selected. In this sample, 58.8% were female. Is there sufficient evidence to conclude that the document's claim is ..
Estimating the sample standard deviation using normal score - Find the sample standard deviation?
Use the value 20 for the population standard deviation of scores on this subsection.
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
Given that P (A) = 0.7, P (B) = 0.5, and P (A B) = 0.8. Find the following probabilities:
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