Construct a stem-and-leaf diagram, Basic Statistics

Assignment Help:

An internal report issued by the marketing manager of a oil-change franchise claims that the mean number of miles between oil changes is for franchise customers is at least 3600 miles. One franchise owner suspects that the mean distance is actually less than 3600 miles. She collects a random sample of 10 customers, and determines the distance each had driven between oil changes. She finds the following results.

3655    3734    3700    1946    3208

3311    2789    3920    3555    3902

a) Construct a stem-and-leaf diagram.

b) Does your stem-and-leaf diagram  in (a) suggest that the distribution of distances is not normal? (For instance, is there any evidence that the distribution is skewed?)

c) Construct TWO 99% confidence intervals.  

(i) Use the z-tables.

(ii) Use the t-tables.

d) Interpret your result in (ii) in words.

e) You now must decide: is the mean distance between oil changes 3600 miles, or not? Explain your reasoning.

f) Which (if either) of the confidence intervals in (c) is appropriate? (Suggestion: look at your answer to (b).) Explain briefly.


Related Discussions:- Construct a stem-and-leaf diagram

Regression, Read the article “Apple turns over entire inventory every five ...

Read the article “Apple turns over entire inventory every five days.”1 It is not surprising that, the success of managing inventory can lead to the success of a firm’s operational

Probabilities, What is the probability of selecting exactly one red and one...

What is the probability of selecting exactly one red and one blue fish (Total red is .479 and total blue is .521 and total of both is 1.000) I cannot figure out the formula or how

Cyclical variation, what is the basic difference between seasonal variation...

what is the basic difference between seasonal variation and cyclical variation

Online homework, I need help with online accounts homework.

I need help with online accounts homework.

What are the decision variables, Question 1 Water resources in many pa...

Question 1 Water resources in many parts of Australia are being closely watched and restrictions have been imposed on activities such as garden watering. Suppose that SA Water

Conversion bonds, i need problems and their answers in a simplified way to ...

i need problems and their answers in a simplified way to understand the material because im really having troubles understanding how to solve conversion bonds and share warrants pr

Marginal and absorption costing, difference of them for covering the follo...

difference of them for covering the following: 1.purpose of reporting 2.FORMAT OF INCOME STATEMENT

What is use of Advantageous , What is use of Advantageous Immediate non-fi...

What is use of Advantageous Immediate non-financial, work-related advantages accruing to the condition.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd