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

Probability, A machine that cuts corks for wine bottles operates in such a ...

A machine that cuts corks for wine bottles operates in such a way that the distribution of the diameter of the corks produced is well approximated by a normal distribution with mea

Commission, if someone sold a house and received a $10,000 commission, how ...

if someone sold a house and received a $10,000 commission, how would i write that into a journal

Give structural reasons for the binding dependence, Binding studies were ca...

Binding studies were carried out in which heparin was immobilized on the surface of cuvettes. The pH dependence of HPRG binding to heparin was investigated and the results are show

Project, impact of cost accounting technique in organizational performance

impact of cost accounting technique in organizational performance

Management accounting, how cost classification can helpful for planning, co...

how cost classification can helpful for planning, controlling and decision making

Bi variate frequency distribution, solved example with data of bi variate f...

solved example with data of bi variate frequency distribution

Ordering cost, 1) Define and explain the following: i) Ordering cost ii) Sa...

1) Define and explain the following: i) Ordering cost ii) Safety stock iii) Re-order point 2) Profit Volume Chart. 3) Discuss the various techniques of financial statement analysis

Normal distribution, For a normal distribution why do we calculate the prob...

For a normal distribution why do we calculate the probability of a range of numbers instead of the probability of a single number?

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