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1. Travelers are asked how many hours they are willing to drive while on vacation in one day. A total of 86 travelers reported a mean of 11.55 hours with a standard deviation of 1.2 hours. Find the 99% confidence interval for the mean number of hours travelers are willing to drive.
What is your value for E?
What is your confidence interval?
2. 18% of the students at Brockport College live in within five miles of the campus. You take a sample of 84 students. What is the 85% confidence interval for the population proportion of students who live within five miles of the campus?
3. A soccer ball manufacturer wants to estimate the mean circumferance of mini-soccer balls withing 0.15 inch. Determine the minimum sample size needed to construct a 99% confidence interval for the population mean. Assume that the population standard deviation is 0.20 inch.
Indicate which distribution to use in order to find confidence intervals for the unknown population mean from a random sample taken from the population
Use an ANOVA with α=.05 to determine whether there are any significant differences among the three treatment means. (both by hand and in PASW), for the hand version of problem.
A doctor gives a patient a8080?%chance of surviving bypass surgery after a heart attack. If the patient survives the? surgery, then the patient has a2525?%chance that the heart damage will heal. Find the probability that the patient survives the s..
Suppose you know that male height (for adults) is normally distributed with a mean of 70 inches and a std dev of 3 inches. a) How many deviations is a 74.5 from the mean? b) What is the z value for 74.5? c) Why are they the same?
Construct a 95% confidence interval for the population mean service charge if a customer's account falls below the $1,500 minimum.
In each situation below, is it reasonable to use a binomial distribution for the random variable X? Give reasons for your answer in each case.
the lifetimes in years of a certain kind of electronic component is a random variable having probability density
1. suppose the average thread-life of a certain brand of tire is 42000 miles and that this mileage follows the
Find a 95% confidence interval for the proportion of all customers who would benefit by purchasing the extended service plan.
Enter the data into R, and calculate the means for placebo and epinephrine. Find a 95% confi dence interval for the mean difference in cholesterol levels between the placebo and epinephrine. Use the confi dence interval to test your null hypothes..
Write a program to calculate students average test scores and their grades - a method to read and store data into two arrays, a method to calculate the average test score and grade and a method to output the results.
the sample of test scores is given below. create a relative frequency histogram of the data with 5 classes. describe
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