Random variables with standard deviations
Consider two random variables with standard deviations equal to 1.5 and 2.1. The standard deviation of the average of these two variables is equal to 1.7. The covariance is then equal to:
Answer
4.90
2.45
-3.77
2.50
Expected delivery within 24 Hours
The foreman at a large plant estimates that there are defective parts about 1% of the time. If the plant produces 20,000 parts in a week, what is the variance for the number of defective parts?
Consider two random variables with standard deviation 1.60 and 3.90. The correlation between the two random variables is equal to -0.45. The covariance is equal to:
A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machinery has been frequently failing and requiring repairs and service.
An agricultural experimenter, investigating the effect of the amount of nitrogen x applied in 45 kg per hectare on the yield of oats y measured in 35 litres per hecrare, collected the following data:
Farming is a very risky business because of the possibility that bad weather might cause financial ruin. Farmers usually insure their crops each year against possible losses resulting from bad weather.
Describe the sampling distribution for X based on random samples of 25 one foot sections. (you need to name the distribution and give the mean and standard deviation of the distribution.)
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05.
Find the probability that the chip is defective, then, given that the chip is defective, give the conditional probability for each line.
1922699
Questions Asked
3,689
Active Tutors
1449727
Questions Answered
Start Excelling in your courses, Ask a tutor for help and get answers for your problems !!
Which of the following explains how mucus secreted by epithelial cells on the mucosal surface aids in pathogen destruction?
: The functions of the skeletal system consists of support, protection, movement, mineral storage, blood cell production, energy storage & endocrine regulation
Question: What is it about a dragonfly eye that makes it a good model to describe a superforecaster's thought process?
Mechanism: In the rumen, methane is mainly produced when microbes ferment fiber to acetate and hydrogen, which methanogens convert to CH4.
Design a method for sampling animal fecal matter that would be simple to use and reliable.
How could you determine which leaf shape, rounded or pointed, is dominant and which is recessive?
What is the average CH4 emitted by the sheep? Why do you think that the data from Cow #54 was not helpful?