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

Calculate the expected value, Imagine you are faced with the opportunity to...

Imagine you are faced with the opportunity to play two coin flips, in which you get to call heads or tails prior to the flip of a fair, two-sided coin.  (That is, heads and tails h

Explain hypothesis test, Oprah Winfrey endorsed Barack Obama in the Democra...

Oprah Winfrey endorsed Barack Obama in the Democratic presidential primary. Does Oprah's endorsement make a difference? If so, we would expect support for Obama to be higher among

Kolmogorov test, how can i get a free software to run a kolmogorov test?

how can i get a free software to run a kolmogorov test?

Draw the roc diagram-equilibrium probability, A. Use the inequality derived...

A. Use the inequality derived for part C question 3; to obtain an inequality required x *CD  = 1 to remain stable against DD invaders. Also draw the ROC diagram discussed in class

Calculate the lower and upper control limits, Question: Data entry cler...

Question: Data entry clerks at ARCO key in thousands of insurance records each day.  They have just completed a new training program and want to establish a control chart based

Simple Random Selection, What is the properties of a simple random sample w...

What is the properties of a simple random sample when 50 females are numbered 1 through 50, and males are numbered 51 through 100?

Index numbers, Analyse the different types of index numbers numbers numbe...

Analyse the different types of index numbers numbers numbers and their benefit to the Differentialgleichungen business world.

Test statistic and the p-value, An experimental surgical procedure is being...

An experimental surgical procedure is being studied as an alternative to the old method. Both methods are considered safe, but the new method has the potential to reduce operating

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