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Calculate a 95% confidence interval for the coefficient of height, and interpret it in the context of the data. One tree sample is 79 feet tall, has a diameter of 11.3 inches, and is 24.2 cubic feet
Describe how you could determine if the fishing is better at Pyramid Lake from a boat or from the shore by creating either an independent or dependent sampling plan.
What if the sample size used were 50, with 2 sigma? What happens to sigma ^p when the sample size is larger? Explain why the lower control limit cannot be less than 0.
Be sure to identify the null hypothesis, alternative hypothesis, test statistic, rejection region, conclusion about the null hypothesis, and a final conclusion that addresses the original claim that
In the actual voting Obama got 50% and Romney got 49.1%. The purpose of this problem is to see if the pole was faulty. To answer this, do the following. Construct a 95% confidence interval for the t
Suppose four people, two men and two women, sit in a row, on chairs marked from left to right 1, 2, 3, 4. Let X be the number of the rightmost chair occupied by a man. Let Y be the number of the lef
A restaurant claims that the standard deviation in the lenght of serving times is less than 2.9 minutes. A random sample of 23 serving times has a standard deviation of 2.1 minutes.
Obtain the sample mean and the sample standard deviation of each of the three samples.Obtain total sum of squares (SST,)treatment sum of squares (SSTR,)and error sum of squares (SSE)by using the def
Let X and Y be independent exponential random variables with means 2 and 3 respectively. Let Z=X+Y. Determine P(2<=Z<=6)
Suppose that the skewness associated with the residuals from a multiple regression of 88 observations is -0.3 and the excess kurtosis is
Let X be a continuous distribution with probability density function: f(x))=2/(x+3)^2 if x>= -2 and f(x)=0 otherwise. Let Y=X^2. Determine P(Y<=4)
Let (X,Y) be jointly distributed random variables with joint density f(x,y)=1/9 for 0<=x<=3 and 0<=y<=x^2. Determine f(X=x given Y=2)
Suppose we wanted to know if people get more nervous before flying in an airplane or taking a ship to their destinations. In other words, are people more afraid of falling from the sky or sinking in
Construct a 95% confidence interval for the true proportion of people who planned to vote for Obama. Using your results from a, tell if the fact that Obama got 50% of the votes cast showed the poll wa
An experiment investigating the effect of exercise on happiness randomly assigns participants to one of four groups : moderate aerobic exercise, strenuous aerobic exercise,
If the average weight losses are to be compared among 3 different diets, which of the following methods of analysis seems most appropriate?
Which of the following are assumptions of the analysis of variance F test for comparing population means of several groups?
Describe a fictional two-group experiment that could be tested with an independent t-test but violates the assumption required for homogeneity of variance. Explain what the researcher could have don
What is the test value for this hypothesis test? Test value: Round your answer to three decimal places. What is the critical value?
Let X be a continuous distribution with probability density function: f(x))=2 / (x+3)^2 if x>= -2 and f(x)=0 otherwise. Let Y=X^2. Determine P(Y<=4)
Use the binomial distribution to determine the probability that 2 defective bulbs are found. Use the poisson approximation to the binomial distribution to determine the probability that 2 defective bu
A particular intersection in delaware is equipped with a surveillance camera. The number of traffic tickets issued to drivers passing through the intersection and averages 4.5 per month.
An e-commerce web site claims that 6% of people who visit the site make a purchase. answer the following questions based on a random sample of 15 people who visited the web site.
What is the probability that either six or seven people enjoyed the commercials more than the game? What are the mean and standard deviation for this distribution?
According to a survey of 25,000 households conducted by Nielson Company, 51% of the people watching the 2010 Super Bowl enjoyed the commercials more than the game itself. Consider a random sample of