stat q4
Imagine that Car Middle East, a car magazine is comparing that repair costs incurred during the first four years on two types of family car the Camry and Altima. Random samples of 60 Camry cars and 66 Altima cars are selected. The mean repair cost is $1,679 for Camry and $1,485 for Altima and with the sample standard deviation are $267 and $326 respectively. Assume that the distribution is normally distributed with equal variances.
a. find its pooled standard deviation.
b. based on the sample information, determine the 90% confidence interval estimate for the difference between two population mean.
Our guarantees
Study Acers provides students with tutoring and help them save time, and excel in their courses. Students LOVE us!No matter what kind of essay paper you need, it is simple and secure to hire an essay writer for a price you can afford at StudyAcers. Save more time for yourself. Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
Money-back guarantee
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Read moreZero-plagiarism guarantee
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Read moreFree-revision policy
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.
Read morePrivacy policy
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
Read moreFair-cooperation guarantee
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
Read more