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

Free hand in measurig trend, advantages and disadvantages of free hand in m...

advantages and disadvantages of free hand in measurig trend

Power supply, A source of electrical power. A device or system which delive...

A source of electrical power. A device or system which delivers electrical and or other types of energy to a corresponding device or system. Are commonly referred to as PSU (Power

binomial problem-replication strategy, It is 11:30pm on Thursday evening, ...

It is 11:30pm on Thursday evening, New York City time. You are still recovering from your long haul flight from Sydney which arrived at JFK only hours ago. Thank your favourite dei

How will the adoption of ifrs change financial reporting, How will the adop...

How will the adoption of IFRS change financial reporting by companies? Manager 1: The new rules will definitely change the way our organization prepares financial statements.

Determine the probability of coding region , Using 1 st order models shown...

Using 1 st order models shown in homework 2 solution determine the probability of coding region in frame two for DNA fragment AGTAGCTTCCAG. Use only parameters provided in the hom

Calculate present value-hpr and future value , Semiannual coupon = 10%*$100...

Semiannual coupon = 10%*$100/2 = $5 Since it is one-year semiannual bond, it pays two coupons, one at six months from now and the other at maturity when the bank account will be

Karl Pearsons, ). Calculate Karl Pearson’s coefficient of correlation from...

). Calculate Karl Pearson’s coefficient of correlation from the following data , using 20 as the working mean for price and 70 as the working mean for demand: Price: 14 16 17 18 1

What is owner’s equity, What is owner’s equity? Owner’s value is on...

What is owner’s equity? Owner’s value is one of the three primary elements of a single proprietorship’s stability piece and bookkeeping situation. Owner’s value symbolizes

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