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

#title.research.methods and statistics, identify a research report publishe...

identify a research report published by reputable agencies and evaluate the following ;the problem that was addressed

Profit margin (return on sales), Hugh Snore Bedding, Inc. has assets of $40...

Hugh Snore Bedding, Inc. has assets of $400,000 and turns over its assets 1.5 times per year. Return on assets is 12%. What is its profit margin (return on sales)?

Probability and stochastic process, In a quaternaryphase shift keying (QPSK...

In a quaternaryphase shift keying (QPSK) communications system, one of four equally probable symbols s0,...,s3 is transmitted in T seconds. If symbol si is sent, a waveform x(t,si)

Certificate of participation [cop), Certificate of participation [cop) A d...

Certificate of participation [cop) A debt financing agenda administered by the Office of the State Treasurer, A COP is an instrument evidencing a pro rata split in a exact pledged

Calculate the numerical value- draw the casual tree, A, Explain how a perso...

A, Explain how a person can be free to choose but his or her choices are casually determined by past event B , Draw the casual tree for newcomb's problem when Eve can't perfectl

When are expenses credited, When are expenses credited? While common jo...

When are expenses credited? While common journal cost records are typically debited and have debit account balances, there are times when the cost records are acknowledged.

Define block grant, Define block grant A federal grant that consolidates, ...

Define block grant A federal grant that consolidates, for a wide reason or any type of purpose, funds previously awarded for a wide variety of activities.

Calculate the Average Mean Temperature, The following are actual data showi...

The following are actual data showing the latitude of a sample of major cities in the northern hemisphere and their mean high annual temperature. latitude(X)

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