Question

A pencil company wants to compare the variation in the circumference of their product from two...

A pencil company wants to compare the variation in the circumference of their product from two different production methods. They take a random sample of 57 pencils produced from method 1 and they take a random sample of 65 pencils from method 2. They determine that variance number one equals 26.2 and variance number 2 equals 13.1. The company wants to determine if the population variance from method 1 is greater than the population variance from method 2. Let alpha equal .01. What are the hypotheses equal to? What is the test statistic and p value?

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A company wants to examine the average operation time for a process. Two methods were used....
A company wants to examine the average operation time for a process. Two methods were used. A random sample of 40 for the first method gives an average mean time of 20.5 minutes with variance of 3 minutes. A random sample of 50 for the second method gives an average mean time of 17.6 minutes with variance of 4 minutes. (Use normal distribution with variance known) Determine the 95% confidence interval for the difference between the means At alpha =0.05...
A company that makes language learning software wants to determine which of two approaches (Method A...
A company that makes language learning software wants to determine which of two approaches (Method A or Method B) to learning vocabulary would lead to the largest number of recalled words. The company wishes to evaluate the methods on 7 different languages (since languages differ in difficulty). Seven individuals, one per language, were recruited to learn words using Method A, and 7 individuals, one per language, were recruited to learn words using Method B. After one month, each person completed...
This requires you to show ALL work needed to conduct the two tests of hypotheses below....
This requires you to show ALL work needed to conduct the two tests of hypotheses below. Determine if your tests are one tailed or two-tailed according to your alternative hypothesis. You will have to use a z table as well. 1) A random sample of 20 observations selected from a normal population produced x bar = 72.6 and s^2 (variance) = 19.4 a) Test the null hypothesis: mean = 80 against the alternative hypothesis: mean < 80. Use alpha =...
A fast food company uses two management-training methods. Method 1 is a traditional method of training...
A fast food company uses two management-training methods. Method 1 is a traditional method of training and Method 2 is a new and innovative method. The company has just hired 31 new management trainees. 15 of the trainees are randomly selected and assigned to the first method, and the remaining 16 trainees are assigned to the second training method. After three months of training, the management trainees took a standardized test. The test was designed to evaluate their performance and...
The National Aeronautics and Space Administration (NASA) buys bolts from two suppliers, and it is very...
The National Aeronautics and Space Administration (NASA) buys bolts from two suppliers, and it is very important the mean widths of the bolts received from both suppliers are equal since they must be used interchangeably.  NASA receives a large shipment of bolts from each supplier, and draws a random sample of 49 bolts from each shipment. It wants to test whether the mean width is the same in both shipments.  Suppose that NASA finds the mean width of the bolts taken from...
A study was designed to compare the attitudes of two groups of nursing students towards computers....
A study was designed to compare the attitudes of two groups of nursing students towards computers. Group 1 had previously taken a statistical methods course that involved significant computer interaction. Group 2 had taken a statistic methods course that did not use computers. The students' attitudes were measured by administering the Computer Anxiety Rating Scale (CARS). A random sample of 99 nursing students from Group 1 resulted in a mean score of 65 with a standard deviation of 6.2 A...
A study was designed to compare the attitudes of two groups of nursing students towards computers....
A study was designed to compare the attitudes of two groups of nursing students towards computers. Group 1 had previously taken a statistical methods course that involved significant computer interaction. Group 2 had taken a statistic methods course that did not use computers. The students' attitudes were measured by administering the Computer Anxiety Rating Scale (CARS). A random sample of 11 nursing students from Group 1 resulted in a mean score of 65 with a standard deviation of 4.7. A...
Suppose you have selected a random sample of ?=14 measurements from a normal distribution. Compare the...
Suppose you have selected a random sample of ?=14 measurements from a normal distribution. Compare the standard normal ? values with the corresponding ? values if you were forming the following confidence intervals. (a)    90% confidence interval z= t= (b)    95% confidence interval z=   t= (c)    98% confidence interval ?= t= 2) A confidence interval for a population mean has length 20. a) Determine the margin of error. b) If the sample mean is 58.6, obtain the confidence interval. Confidence interval: ( ,...
3a. A pet food marketing company wants to find the average age of dogs in a...
3a. A pet food marketing company wants to find the average age of dogs in a city and first needs to find out how large a sample “n” it will need.  The company wants to be 95% confident that their estimate will be accurate within 6 months (0.5 year). From a previous study the population standard deviation is known to be 2.9 years. For Question 3a, fill in the blank with the Z sub alpha/2 value (positive, of course) of the...
Test the given claim. Assume that a simple random sample is selected from a normally distributed...
Test the given claim. Assume that a simple random sample is selected from a normally distributed population. Use either the​ P-value method or the traditional method of testing hypotheses. Company A uses a new production method to manufacture aircraft altimeters. A simple random sample of new altimeters resulted in errors listed below. Use a 0.05 level of significance to test the claim that the new production method has errors with a standard deviation greater than 32.2​ ft, which was the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT