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

6.2, comulativefrequencydistribution

comulativefrequencydistribution

What is the margin of error, The National Quality Research Center at the Un...

The National Quality Research Center at the University of Michigan provides a quarterly measure of consumer opinions about products and services (The Wall Street Journal, February

Ordering cost, 1) Define and explain the following: i) Ordering cost ii) Sa...

1) Define and explain the following: i) Ordering cost ii) Safety stock iii) Re-order point 2) Profit Volume Chart. 3) Discuss the various techniques of financial statement analysis

How to calculate mean?, Mean The mean is commonly the most significant ...

Mean The mean is commonly the most significant of all the numerical measurements used to describe data, and it is what the most people call an average. Example  Find

Compute the mean absolute deviation and mean square error, Toyota Motors in...

Toyota Motors introduced a hybrid car Hybrid G in the U.S. market in 2006. In the first three years, the sales of Hybrid G were strong due to the buzz surrounding the hybrid car co

Testing the hypothesis type 1 and type 2 error, ...if a transit employee pr...

...if a transit employee provides a strand of hair for drug testing, state the null and alternative hypothesis in verbal terms, then identify what would constitute a type 1 and typ

Hypothesis testing, The caffeine is expected to lower reaction time by an a...

The caffeine is expected to lower reaction time by an average of 30 msec. Scores on the simulator task for the regular population (without caffeine) form a normal distribution with

Construct the frequency distribution, 1) Here we are given a raw data and w...

1) Here we are given a raw data and we are supposed to construct the frequency distribution of that data and plot the histogram of it. The dataset contains the values from 1 to

Calculate and interpret, U.S. College presidents have described alcohol abu...

U.S. College presidents have described alcohol abuse as the number one problem on campus.  How common is it?  As a super crackerjack student, you conducted a survey of 17,096 stude

Define Allocate , Define Allocate To split a lump-sum appropriation into p...

Define Allocate To split a lump-sum appropriation into parts that are specific for expenses by particular government models and/or for particular requirements, actions, or things.

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