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

Bad debt reserve, Explain definition of bad debt reserve and provision in t...

Explain definition of bad debt reserve and provision in terms of accounts receivable likely to be uncollected. Bad debt reserve provision Bad debt reserve provision is a amount

Accounting and finance for managers, From the following information related...

From the following information related to XYZ Ltd.; you are required to find out (a) contribution (b) Break-even point in units (c) Margin of safety, (d) Profit Total Fixed Costs

Discovery of Neutron, Discovery of Neutron A neutron is a neutral particle...

Discovery of Neutron A neutron is a neutral particle carrying no charge, and having mass equal roughly to the mass of a proton. This particle was discovered experimentally by Chad

What is Agency financial reporting system (afrs), What is Agency financial ...

What is Agency financial reporting system (afrs) The state-wide sales system managed by the Workplace of Economical Control. AFRS is the condition of Washington''s established sa

The smallest total monthly cost , Each month, the firm Cashco has 50% chanc...

Each month, the firm Cashco has 50% chance that an amount of $ 1,000 will be credited In its current account, and a 50% chance that the account is debited $ 1,000. As current accou

Find mode and median, The following data shows marks obtained by 40 student...

The following data shows marks obtained by 40 students in a Statistics test. 75 99 72 54 25 40 65 32 69 10 85 48 52 80  63 64 35 62 51 71 67 57 95 74 56 69 61  49 45 63 39

develop simulation model-compute average amount, Bob Smith recently comple...

Bob Smith recently completed his MBA and accepted a job with a computer company. To ensure that his retirement is comfortable, he intends to invest $3,000 of his salary into a tax

Research design, Hi there, I am designing a research study for my undergrad...

Hi there, I am designing a research study for my undergrad in Online Relationship. I am having some trouble with my professor accepting my proposed research model and survey questi

Compute the data using both Megastats and Excel Data, AA major razor blade ...

AA major razor blade manufacturer advertises that its twin-blade disposable razor “gets you lots more shaves” than any single-blade disposable razor on the market. A rival company

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