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Scientists, researching large woody debris (LWD), surveyed the number of LWD pieces from aerial photos taken annually for the past 35 years at two different sites. Over the 35 years of photos examined, the first site had a mean number of LWD pieces per hectare per year (LWD/ha/yr) of 3.7 pieces with a standard deviation of 1.9. The second site had a mean number of LWD/ha/yr of 4.3 with a standard deviation of 2.4. Assume a .05 significance level for testing the claim that the mean LWD/ha at the first site had less than the mean LWD/ha/yr at the second site. Also, assume the two samples are independent simple random samples selected from normally distributed populations, but do not assume that the population standard deviations are equal.Construct a 90% confidence interval for the difference between the two means.
A company makes a chemical product, and based on extensive experience they believe the critical-to-quality variable for this product has mean 410 and standard deviation 10.
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Scores by women on the SAT-I test are normally distributed with a mean of 998 and a standard deviation of 202. Scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6. Assume that the two tests ..
American Theaters knows that a certain hit movie ran an average (μ) of 84 days in each city, and the corresponding standard deviation (σ) was 10 days. The manager of the southeastern district was interested in comparing the movie's popularity in his ..
if you were constructing a 99% confidence interval of the population mean based on a sample of n= 20 where the standard deviation of the sample s= 0.05 the critical value of t will be
The data in the table below is from a study conducted by an insurance company to determine the effect of changing the process by which insurance claims are approved. The goal was to improve policyholder satisfaction by speeding up the process and eli..
Major League Baseball there are five teams in the Western Division of the National League: Arizona, Los Angeles, San Francisco, San Diego, and Colorado. How many different orders of finish are there for these five teams? Place your answer in the blan..
The C.S. Mott Children's Hospital surveyed a national random sample of parents about their desire for email consultation for their child's minor illness or injury and their willingness to pay for this convenience.
Sixty percent of the families in a certain community own their own car, thirty percent own their own homes, and twenty percent own both their own home and own car. If a family in the community is randomly chosen, what is the probability that they own..
a. Use the multiplication rule to find the probability that your first two digits match those drawn and your last two digits do not match those drawn. That is, find P(MMXX), where M denotes a match and X denotes a digit that does not match the ..
this assignment requires a considerable amount of computer work and written comment. you may need to seek guidance from
Determine the z score and the area.
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