Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
the distribution was normally shaped with xobt = 80 and s = 8. which did better on their exam relative to those taking the exam
Find the MTBF for a product that will have a minimum cost over a 5 year period if the product will be operated 5,000 hours per year where, TC
A manufacturer of computers claims its batteries last an average of 3.5 hours before needing recharging. For a sample of 10 batteries, the mean life was 3 hours and the standard deviation
Major General Haroon, director of the Army War College's new 6-month attaché training program, is concerned about how the 20 officers taking the course spend their precious time
Angioplasty is a medical procedure in which an obstructed blood vessel is widened. In some cases, a wire mesh tube, called a stent, is placed in the vessel to help it remain open
A random sample of five accidents resulted in the following number of persons injured: 18, 15, 12, 19, & 21. Using the .01 significance level,
The Root Mean Squared Error is best described as a measure of what? Correct. As the name implies, the root mean squared error is a measure of the "average" prediction error for all points in the sam
Calculate standard error of mean and make an inference about the accuracy of the mean by analyzing problem in Statistics for Business and Economics.
Run the Chi-Square test for independence using the calculator provided in the module. Note that StatCrunch does NOT support this type of Chi-Square.
Composite sampling is a way to reduce laboratory testing costs. A public health department is testing for possible fecal contamination in public swimming pools.
The length of a rod is normally distributed with mean 4 inches and variance 0.01 square inch. Two such rods are placed end to end and fitted into a slot
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews
One group was taught using a combination of lecture and programmed instruction, the other using a combination of lecture and television. At the end of the course, each group was given a 50-item test
Consider rolling one (six-sided) fair die and tossing one (two-sided) fair coin. If the coin turns up heads, then the number of spots showing on the die is the score of that trial. If the coin turns
Assume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample approximately half the size
Calculate the sample size needed given these factors: 1. one-tailed t-test with two independent groups of equal size
How often do you watch movies at home? A USA Today snapshot found that about 7 in 10 adults say they watch movies at home at least one a week. Suppose a random sample of n = 50 adults
Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion). Draw 20 more samples and add the 20 new x-bars to the histogram in part b
During a recent year the average cost of making a movie was $54.8 million. This year, a random sample of 15 recent action movies had an average production cost of $62.3 million
The standard deviation of the population is $200. Can one reject the claim at alpha = 0.05? Use the traditional method
candies and perform an examploe Chi-squared analysis based on your random sampling(s). State a hypothesis and a few reasons why it along with your Chi-squared analysis
Compare and contrast random selection and random assignment. Be sure to include a discussion of when you would want to do one or the other and the possible consequences of failing to do random selec
The designs must involve two different statistical analyses. For each design, specify and justify each of the four factors and calculate the estimated sample size you'll need. Give reasons for any p
state the hypothesis and identify the claim, a. There is less than 7 beds per house in Compton; Decision in to reject the null hypothesis
experts claim that 10% of murders are committed by women. is there enough evidence to reject the claim if in a sample of 67 murders, 10 of them were committed by women