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A manufacturer claims that its wood treatment protects outdoor wood fences a mean of 2601 days with a standard deviation of 40.9 days. Assume a normal distribution. In a test of the claim, the wood treatment of a randomly selected fence lasted 2540 days.
(a) If the manufacturer's claim is true, what is the probability that the wood treatment on a randomly selected fence lasts a time less than 2540 days?
(b) Answer the question in (a) if the standard deviation is 25.1 days instead of 40.9 days.
the hawks are currently winning 0.55 of their games. there are 5 games in the next two weeks. what is the probability
Is there meaningful relationship between grades and SAT scores? If student scores 450 on the SAT, what do youbelieve his or her GPA will be?
Show the histograms and calculate their means and variances and comment on your findings.
1.an experiment was conducted to examine the yield of six different types of alfalfa. they were planted in four
One measure of the overall sampling error in the entire distribution of sample means is the
Draw the suitable 2x2 table, compute and interpret suitable measure of association.
Use q23data.dta.What is the relationship between the hours a person works and the hours his or her spouse works?Do this for women and for men separately.Compute the correlation, the regression results, and the scattergrams.
suppose 40 of the vehicles passing through a toll booth are trucks and the rest are cars.a truck pays a 5 toll whereas
47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students will return more than 50% students with children under 17 living at home with them.
Use the average of 2001, 2002 and 2003 as the base and determine indexes for 2005 and for the preliminary 2006 data using 100 as the base value.
How can you tell when you should use the ANOVA versus a t-test? What is one problem with using the ANOVA when the t-test is the appropriate data analysis?
A random sample of 72 statistics students was taken to estimate the proportion of students who are also in the Math Club. The 90% confidence interval was 0.438 to 0.642. Using this information, what sample size would be necessary to estimate the t..
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