🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Statistics
1
answer
0
watching
106
views

4. A statistics practitioner would like to draw a histogram of 62 observations that range from 5.2 to 6.1. What is an appropriate number of classes for intervals?

Watch
1
answer
0
watching
106
views

For unlimited access to Homework Help, a Homework+ subscription is required.

JC
JCLv4
12 Feb 2021

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

Related questions

A data set consists of 125 observations that range between 37 and 188. What is the appropriate number of classes to have in the histogram?


1. Mr. Jones is interested in determining how long it takes his students to write essays for his class. 

The table below shows the mean and standard deviation for the length of time to write an essay (in minutes) for a random sample of 20 AP Statistics students and a random sample of 25 physics Honors students. (These are from all students he has had through the years)

Based on the histogram of the data, it is not unreasonable to assume the distribution of essay times is approx normal.

a. Estimate the mean difference in essay completion times for all AP Statistics and Physics Honors students In Mr. Jone's classes.

b. Based only on this confidence interval, do you think the difference in the mean wait times is statistically significant? Justify your answer.

 

A reading comprehension test out of 90 points is given to a Grade 5 class of 30 students. Their scores are randomly listed below. 77 43 60 28 59 60 63 59 45 79 38 51 79 54 62 71 51 43 63 59 54 54 60 56 51 71 34 62 28 62 Part 1. (21 points) a. Prepare a frequency distribution table of the raw scores* grouped according to frequency (f). Also show the cf and the c% columns. For c% report up to 2 decimal places. Don’t round up. (*Hint: show only the scores in the data set.) (10 pts) b. Draw a bar graph of this f-distribution table. Be sure to label the axes. (4 pts) c. Make a stem and leaf display of the scores. Be sure to label the two columns of the display and arrange the leaves in ascending order. (4 pts) d. Find the percentile rank of X = 50. Use the f-distribution table with scores grouped according to class intervals, i = 5, in Part 2a below. (Hint: use the formula in the course Study Guide.) (3 pts) Part 2. (21 points) a. Prepare a f-distribution table with the scores grouped according to class intervals, i = 5. Show the f, cf, and c% columns. For c% report up to 2 decimal places. Don’t round up. (10 pts) b. Draw a histogram of this f-distribution table. (4 pts) c. Draw a polygon of this f-distribution table. (4 pts) d. Find the 20th percentile in this f-distribution table. (Hint: use the formula in the Course Study Guide.) (3 pts)

Weekly leaderboard

Home
Homework Help 3,900,000
Statistics 10,000
Start filling in the gaps now
Log in