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1. 12 mature citrus trees of one variety and 15 of another gave means and standard deviations of their heights as 13.8 and 12.9 ft (means), and 1.2 and 1.5 ft (standard deviations). Find a 95% confidence interval for the true difference in average heights between all trees of the first and the second variety.Would you be able to validate the assumptions in this case?
2. 25 observations are collected from a normal distribution with variance 4. give a number 'c' such that the sample mean is within a distance 'c' from the population mean with a probability of 95%.
Based on the sample findings, estimate the true mean of Saturday sales with 90% probability.
What is the probability that the project will be completed in 17 months or less?
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Solve the mean and standard deviation equations
If probability of drawing a face card is 0.625. Determine the probability of not drawing a face card.
Mark makes it a policy not to buy bananas unless the price is 33 cents or less per pound. What proportion of the time would he buy bananas?
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?
Please use the regression procedure within Excel under Tools > Data Analysis to construct this equation.
Let X be a random variable uniformly distributed on the interval (0,1). Let Y be a new random variable defined as Y = X2. What is the probability density function of Y given by?
A study of vehicle flow characteristics on acceleration lanes found that one out of every six vehicles uses less than 1/3 of the acceleration lane before merging into the traffic.
A survey of the residents of a new subdivision on why they happened to select that area in which to live. You also wish to secure some information about what they like and do not like about life in the subdivision.
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