Question

In an agricultural experiment, the effects of two fertilizers on the production of oranges were measured....

In an agricultural experiment, the effects of two fertilizers on the production of oranges were measured. Eighteen randomly selected plots of land were treated with fertilizer A. The average yield, in pounds, was 457 with a standard deviation of 38. Twelve randomly selected plots were treated with fertilizer B. The average yield was 394 pounds with a standard deviation of 23. Find a 99% confidence interval for the difference between the mean yields for the two fertilizers. (Round down the degrees of freedom to the nearest integer and round the final answers to two decimal places.)

The 99% confidence interval is (  ,  ).

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Fertilizer: In an agricultural experiment, the effects of two fertilizers on the production of oranges were...
Fertilizer: In an agricultural experiment, the effects of two fertilizers on the production of oranges were measured. Ten randomly selected plots of land were treated with fertilizer A, and 7 randomly selected plots were treated with fertilizer B. The number of pounds of harvested fruit was measured from each plot. Following are the results. Fertilizer A 464 483 441 491 403 466 448 457 437 516 Fertilizer B 414 408 398 382 368 393 437 -Construct a 90% confidence interval...
Two catalysts may be used in a batch chemical process. Twelve batches were prepared using catalyst...
Two catalysts may be used in a batch chemical process. Twelve batches were prepared using catalyst 1, resulting in an average yield of 86 and a sample standard deviation of 3. Fifteen batches were prepared using catalyst 2, and they resulted in an average yield of 89 with a standard deviation of 2. Assume that yield measurements are approximately normally distributed with the same standard deviation. A chemist would like to know if catalyst 2 produces a higher mean yield...
Suppose an experiment is done to compare two fertilizers (called Bandini and Bag-O-BS)used in lettuce fields....
Suppose an experiment is done to compare two fertilizers (called Bandini and Bag-O-BS)used in lettuce fields. Suppose researcherscollected data which consisted of the weights (in grams) of plants after being grown (for a specific amount of time) in soil treated with each kind of fertilizer. Results from the data collectedis shown below: Let x ≡ weight (in grams) of a randomly selected head of lettuce. Assume that independent random samples were selected from each of two normally distributed populations. Sample...
. In an experiment comparing two weight loss plans, 100 subjects were randomly assigned to two...
. In an experiment comparing two weight loss plans, 100 subjects were randomly assigned to two groups, A and B. The mean weight loss in group A was 10 pounds with a standard deviation of 8 pounds and the mean weight loss in group B was 7 pounds with a standard deviation of 11 pounds. The distributions of weight loss are approximately normal.             a. What is the probability that a randomly selected person from group A lost weight?            ...
Twenty cans of soda were randomly selected with an average of 32.6 mg of caffeine. The...
Twenty cans of soda were randomly selected with an average of 32.6 mg of caffeine. The sample standard deviation is 20.33 mg. Use these data to find a 99% confidence interval. Also, find the estimation and margin of error.
Twelve different video games showing substance use were observed and the duration of times of game...
Twelve different video games showing substance use were observed and the duration of times of game play? (in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the sample data to construct a 99 ?% confidence interval estimate of sigma ?, the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution. 4...
A survey of 25 randomly selected customers found that their average age was 31.84 years with...
A survey of 25 randomly selected customers found that their average age was 31.84 years with a standard deviation of 9.84 years. What is the standard error of the mean? How would the standard error have changed if the sample size had been 100 instead of 25 (assuming that the mean and standard deviations were the same)? How many degrees of freedom would the t-statistic have for this set of data? What would the critical value t* be for a...
Suppose that 14 children, who were learning to ride two-wheel bikes, were surveyed to determine how...
Suppose that 14 children, who were learning to ride two-wheel bikes, were surveyed to determine how long they had to use training wheels. It was revealed that they used them an average of elevenmonths with a sample standard deviation of three months. Assume that the underlying population distribution is normal. 1. Which distribution should you use for this problem? (Enter your answer in the form z or tdf where df is the degrees of freedom.) 2. Construct a 99% confidence...
41 burgers were randomly selected from the production process at a fast-food restaurant and the mean...
41 burgers were randomly selected from the production process at a fast-food restaurant and the mean sodium content was measured to be 420 mg. Assume that the sodium measurements are well approximated by a normal distribution with a standard deviation of 156 mg. Calculate the lower bound for the 99% Confidence Interval for the true mean sodium content.
The data below are yields for two different types of corn seed that were used on...
The data below are yields for two different types of corn seed that were used on adjacent plots of land. Assume that the data are simple random samples and that the differences have a distribution that is approximately normal. Construct a​ 95% confidence interval estimate of the difference between type 1 and type 2 yields. What does the confidence interval suggest about farmer​ Joe's claim that type 1 seed is better than type 2​ seed? Type 1 2010 2046 2007...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT