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

Co-relation, Co-relation: Co-relation in this case studies the behavior how...

Co-relation: Co-relation in this case studies the behavior how each of the investment opportunity would react to any event vis – a vis each other. The same is measured in terms of

Indirect method, in my home work it is a balance sheet 12/31/2010 12/3...

in my home work it is a balance sheet 12/31/2010 12/31/2009 accounts recievable 8000 10000 below it has letter a b c d e f-k wanting the letter with the explaination a

Hypothesis testing, After analyzing the data the researcher has to test ten...

After analyzing the data the researcher has to test ten hypotheses various tests such as chi square test t test have been developed by statisticians for the purpose. The hypotheses

Precious harper, October Transactions Date Transaction Description Oct. 1 ...

October Transactions Date Transaction Description Oct. 1 Began business by making a deposit in a company bank account of $12,000, in exchange for 1,200 shares of $10 par value com

Angler survey, Angler survey A survey used by sport fishery managers t...

Angler survey A survey used by sport fishery managers to calculate the total catch, fishing effort and catch rate for the given body of water. For instance, the whole effort m

Ogive curve.., will the ogive curve eventually decrease?

will the ogive curve eventually decrease?

Time quantization and amplitude quantization, A sine wave is sampled at int...

A sine wave is sampled at interval Tand quantixed using N=2bits precision over the range ±1. The sine wave has peroid τ, and T is chosed such that T = 1/8τ Plot one cycle of the

Average, characteristics of a Good Average

characteristics of a Good Average

Discuss the role that racism played in public policies, Discuss the role th...

Discuss the role that racism played in public policies related to urban housing throughout the twentieth century. Did this racism manifest itself solely on an individual level (i.e

CALCULATIONS, CALCULATIONS OF MEAN USING PHSTAT

CALCULATIONS OF MEAN USING PHSTAT

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