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

Hypothesis testing, a clinical psychologist claims that on average, at leas...

a clinical psychologist claims that on average, at least twenty five clients visit her per week. for a random sample of 8 weeks, the following numbers of clients were recorded; 25

6 accounting questions , I have 6 questions for my Accounting class that I ...

I have 6 questions for my Accounting class that I need help with. I only have two hours to complete them. I am trying to get an idea of what I can expect to pay for help with the a

Measures of central tendency, List down various measures of central tendenc...

List down various measures of central tendency and explain the difference between them?

Probability, A survey was done where a random sample of people 18 and over ...

A survey was done where a random sample of people 18 and over were asked if they preferred comedies, dramas, or neither. The information gathered was broken down by age group and t

Ruels, pzl give me ans

pzl give me ans

State the profit maximization problem of firm, Consider two firms producing...

Consider two firms producing an identical product in a market where the demand is described by p = 1; 200 - 2Y. The corresponding cost functions are c1 (y1) = y 2 1 and c2 (y2) =

Transitioning from gaap to ifrs, How important do you think knowledge trans...

How important do you think knowledge transfer and training will be to help in transitioning from GAAP to IFRS? Manager 1: Knowledge transfer is going to be extremely importan

Cyclical variation, what is the basic difference between seasonal variation...

what is the basic difference between seasonal variation and cyclical variation

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