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

Margin of error, The poll interviewed 1500 persons rather than 1060, for 95...

The poll interviewed 1500 persons rather than 1060, for 95% confidence.

Probabilities, What is the probability of selecting exactly one red and one...

What is the probability of selecting exactly one red and one blue fish (Total red is .479 and total blue is .521 and total of both is 1.000) I cannot figure out the formula or how

Time quantization and amplitude quantization, A sine wave is sampled at int...

A sine wave is sampled at interval Tand quantixed using N=2bits precision over the range ±1. The sine wave has peroid τ, and T is chosed such that T = 1/8τ Plot one cycle of the

Process costing - accounting for scrap.., a company has two processes whose...

a company has two processes whose details are as follows: Materials 3000kg @ k0.30/kg, labour K120 for process 1 and material 2000kg @ k0.40/kg and labour k84 for process 2. actual

Researching People:Patterns and Trends., Hi I have done my report based on ...

Hi I have done my report based on SPSS data but need a help for deeper analyzing and correcting this what I have already done. Would you be able to help me and if so how much would

Job order costing, what are the procedure of job order costing

what are the procedure of job order costing

Construct confidence interval for the true mean return, A researcher has ga...

A researcher has gathered data on the daily returns on a portfolio of call options over a recent 250-day period. The mean daily return has been 0.001 and the sample standard deviat

Calculate a confidence interval for the population, A Shoe manufacturing co...

A Shoe manufacturing company designs a new shoe (Brand A) and it wanted to compare its fit with that of the leading brands in the market Nike and Reebok. 27 Customers were asked to

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