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

Predictive Sales Report, A retail store has recently hired you as a consult...

A retail store has recently hired you as a consultant to advise on economic conditions. One important indicator that the retail store is concerned about is the unemployment rate.

Cost of preference sharea, A company wishes to issue new preference shares;...

A company wishes to issue new preference shares; the company will incur flotation cost of 2% per share. the market value of this shares is $90 per share & a nominal value of $100 p

Clipping, Clipping is one form of distortion that occurs when an amplifier ...

Clipping is one form of distortion that occurs when an amplifier is overdriven, which happens when it attempts to increase voltage or current beyond its limits. When an amplifier

Spatial ability test and musical ability test, This question has multiple p...

This question has multiple parts. Use the following information to answer the questions below: Spatial Ability Test Musical Ability Test Mean 80 74 Standard Deviation 6

AMORTIZATION , AMORTIZATION The slow decrease or liquidation of an quantit...

AMORTIZATION The slow decrease or liquidation of an quantity over a time interval according to a specified program (such as, the pension of a debts by sequential repayments to the

Construct a stem-and-leaf diagram, An internal report issued by the marketi...

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 mi

Calculate - mean, how to calculate mean, median and the range on the follow...

how to calculate mean, median and the range on the following data: 15 18 23 22 21 18 14 20 25 12

Probability, What is the probability 0.10 called?

What is the probability 0.10 called?

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