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

Feature of accounting transaction, Classification feature of Accounting Tra...

Classification feature of Accounting Transaction. Under the classification accountant posts the entries into their respective ledgers in the Accounts Books. Every Account entry

Statistics, The amount of time it takes the IRS to send a refund to taxpaye...

The amount of time it takes the IRS to send a refund to taxpayers is normally distributed with a mean of 12 weeks and a standard deviation of 3 weeks. What proportion of the taxpay

Cost of accounting, what are different method of classifying overhead? indi...

what are different method of classifying overhead? indicate the advantag

What is managerial accounting system, Define the Management or Managerial A...

Define the Management or Managerial Accounting System. Ans.  As the name suggest management or managerial accounting system refers to the Management of the firm or company,

Variance analysis, Variance analysis In spending budget (or control sales ...

Variance analysis In spending budget (or control sales in general), a change is the change between an allocated, thought out or conventional quantity and the actual quantity incur

Normal distribution probabllity, The annual precipitation amounts in a cert...

The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 89 inches, and a standard deviation of 16 inches. What is the probability that

Total stockholders equity, To determine the amount at which inventory shoul...

To determine the amount at which inventory should be reported on the December 31 Year 1 balance sheet, Monroe Company compiles the following information for its inventory of Produc

Construct confidence interval for the true mean return, A researcher has ga...

A researcher has gathered data on the daily returns on a portfolio of call options over a recent 250-day period. The mean daily return has been 0.001 and the sample standard deviat

Find population and standerd dev, Find a population data set that contains ...

Find a population data set that contains six entries, has a mean of 5, and has a standard deviation of 2

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