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

Compute the outlier diagnostics, Use the following four data sets for probl...

Use the following four data sets for problem 1.  Be aware that this is a very interesting series of data sets with some special properties. I do not have data files for these data,

Substitution and income effects , Managers are very interested in how ...

Managers are very interested in how a consumer makes choice among alternatives. In this exercise, we ask you to consider the price of gasoline you may purchase to operate

Accounting equation, goods returned by a customer Rs 2000 costing Rs 1900

goods returned by a customer Rs 2000 costing Rs 1900

Define how to make a histogram and a frequency distribution, 1. Describe tw...

1. Describe two graphs/tables and how they are used to examine data. 2. Why are graphs and tables useful when examining data? 3. Describe how to make a histogram and a freque

Study guide, Answers & examples of accounting for the follow on the file be...

Answers & examples of accounting for the follow on the file being sent to you.

Probability, Consider the two events A and B with P(A) = 0.4 and P(B) = 0.3...

Consider the two events A and B with P(A) = 0.4 and P(B) = 0.3. (a) If A and B are independent then compute the probability that Both A and B happen

Statement, prof. ya-lu-chan definitions statistices

prof. ya-lu-chan definitions statistices

Yujhug, An electron, an alpha-particle and a proton have the same kinetic e...

An electron, an alpha-particle and a proton have the same kinetic energy. Which one of these particles has the largest de-Broglie wavelength ?

Bill of exchange, Who can issue a bill of exchange for what purpose? Onl...

Who can issue a bill of exchange for what purpose? Only a supplier who has to get the cash from his client for the purchase which was done on credit score platform can increase

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