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

How Allotment is useful, How Allotment is useful An agency''s plan of appro...

How Allotment is useful An agency''s plan of approximated expenses, income, money payments, and money invoices for monthly of the biennium.

Do you think the change towards ifrs is a good idea, Do you think the chang...

Do you think the change towards IFRS is a good idea? Manager 1: This change is definitely going to be a very positive change. There are no doubt a lot of advantages that IFRS

Capital grants, Capital grants Grants that are restricted for the acquisit...

Capital grants Grants that are restricted for the acquisition: structure: renewal of capital assets associated with an accurate program, Refer to GRANTS & OPERATING GRANTS

Angler survey, Angler survey A survey used by sport fishery managers t...

Angler survey A survey used by sport fishery managers to calculate the total catch, fishing effort and catch rate for the given body of water. For instance, the whole effort m

Biostatics, A national study found that treating people appropriately for h...

A national study found that treating people appropriately for high blood pressure reduced their overall mortality by 20%. Treating people adequately for hypertension has been diffi

Commission, if someone sold a house and received a $10,000 commission, how ...

if someone sold a house and received a $10,000 commission, how would i write that into a journal

Define mortality, Define Mortality: The following rates are used for measur...

Define Mortality: The following rates are used for measuring mortality. Crude death rate The annual crude death rate is defined as  Crude death rate = annual deaths / annual

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

goods returned by a customer Rs 2000 costing Rs 1900

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