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

Normal Random Variable, I need help with the following: Find the ...

I need help with the following: Find the following probabilities for the normal random variable Z: 1) P(Z>1.76) 2) P(Z 3) P(0.59=Z=2.41)

Balance sheet test, told my friend I would help on a test, and now, think i...

told my friend I would help on a test, and now, think its beyond me LOL...want to save face, can you help me?

Determine angle rounded to the nearest degree, Assume that the pulleys are ...

Assume that the pulleys are small frictionless pulleys. Three weights are supported as shown and have weights of W A = P5 N, W B = P6 N, and W C = P7 N.  Determine angle θ

Absorption overheads, Give a brief discussion of the existing traditional ...

Give a brief discussion of the existing traditional method of absorbing overheads

Estimate the national level ndp, In the 2011 federal election, 30.6% of the...

In the 2011 federal election, 30.6% of the electorate voted for the New Democratic Party (NDP). (a) A year later, a national poll of 1836 respondents indicated that 36% support the

Business tax accounting , 1. Passive losses are fully deductible as long as...

1. Passive losses are fully deductible as long as they do not exceed $50,000 during the year. A) True B) False 2. Wages are considered "active income." A) True B) False 3. A de

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.

To find first quartile, how to find 1st quartile from the graph of more tha...

how to find 1st quartile from the graph of more than ogive type, please reply me with an example

Accounting for partnerships and limited liability companies, Tim Snyder and...

Tim Snyder and Jay Wise have decided to form a partnership. They have agreed that Snyder is to invest 30000 and Wise is to invest 40000. Snyder is to devote full time to the busi

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