# Question

Twelve randomly selected mature citrus trees of one variety have a mean height of 13.8 feet with a standard deviation of 1.2 feet, and 15 randomly selected mature citrus trees of another variety have a mean height of 12.9 feet with a standard deviation of 1.5 feet. Assuming that the random samples were selected from normal populations with equal variances, construct a 95% confidence interval for the difference between the true average heights of the two kinds of citrus trees.

## Answer to relevant Questions

The following are the heat- producing capacities of coal from two mines (in millions of calories per ton): Assuming that the data constitute independent random samples from normal populations with equal variances, construct ...Among 100 fish caught in a certain lake, 18 were inedible as a result of chemical pollution. Construct a 99% confidence interval for the corresponding true proportion. With reference to Exercise 11.50, what can we say with 98% confidence about the maximum error if we use the difference between the observed sample proportions as an estimate of the difference between the corresponding true ...Show that if x is used as a point estimate of µ and s is known, the probability is 1 – α that | – µ|, the absolute value of our error, will not exceed a specified amount e when (If it turns out that n < 30, this ...Use the Neyman-Pearson lemma to indicate how to construct the most powerful critical region of size α to test the null hypothesis θ = θ0, where θ is the parameter of a binomial distribution with a given value of n, ...Post your question

0