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

Byron, 1. Provide a video or peer reviewed example analyzing the article an...

1. Provide a video or peer reviewed example analyzing the article and point out the Null, Alternative Hypothesis, and explain how z-testing was used.

Define Annuity , Annuity A sequence of equivalent money payments made or o...

Annuity A sequence of equivalent money payments made or obtained at equivalent durations over a specific time period.

Probability, jay can remember only the first 4 digits of his friends phone ...

jay can remember only the first 4 digits of his friends phone number. he also knows that the number has 7 digits and the last digit is not a zero. if jay were to dial all of the po

Determine the payment at maturity - exchange rate, You have the following l...

You have the following limited information upon which to base your decision as to which is the better of two alternative funding arrangements:  Alternative 1 is to arrange fu

Compute the sample correlation matrix, 1 Compute SX; SXY ; and SY . > # Put...

1 Compute SX; SXY ; and SY . > # Put your R code here. 2 Compute the sample correlation matrix (q_p) between the X and Y variables. Test individual correlations for significance

Quartile Deviation, Quartile Deviation The range as a measure of dispersio...

Quartile Deviation The range as a measure of dispersion discussed above has certain limitations. It is based on two extreme items and it fails to take account of the scatter withi

Homework help, example of descriptive statistics in word form

example of descriptive statistics in word form

Eye, the near point of hypermetropic person is 75cm if the person uses eyeg...

the near point of hypermetropic person is 75cm if the person uses eyeglasses having power +1.0 D,calculate the distance of distinct vision

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