ction 2.4 Homework 5 of 10 (8 complete) HW hours that a random sample of people spend doing chores per week is shown in the pie chart. Use 3 the data. Then use the table to estimate the sample mean and the sample standard deviation of the me ch 1 Weekly Study Hours stribut 0-4 hours (5 people) 5-9 hours (13 people) 10-14 hours (24 people) 15-19 hours (18 people) 20-24 hours (16 people) 25-29 hours (9 people) 30+ hours (6 people) Print Done edit fields and then click Check Answer. hp -
Added by Nerea S.
Close
Step 1
** The class intervals are: * 0-4 hours * 5-9 hours * 10-14 hours * 15-19 hours * 20-24 hours * 25-29 hours * 30+ hours The midpoints are calculated as follows: * (0 + 4) / 2 = 2 * (5 + 9) / 2 = 7 * (10 + 14) / 2 = 12 * (15 + 19) / 2 = 17 * (20 + 24) / 2 = 22 * Show more…
Show all steps
Your feedback will help us improve your experience
Ariana Nash and 57 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
The distribution of the number of hours that a random sample of people spend doing chores per week is shown in the pie chart. Use 32 as the midpoint for "30+ hours". Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the dataset. Click the icon to view the pie chart. Class Frequency, f 0-4 3 5-9 14 10-14 22 15-19 18 20-24 16 25-29 12 30+ 6 Find an approximation for the sample mean. x = 16.9 (Type an integer or decimal rounded to the nearest tenth as needed.) Find an approximation for the sample standard deviation. s = (Type an integer or decimal rounded to the nearest tenth as needed.)
T. L.
The data in the following table reflect the amount of time 40 students in a section of Statistics 101 spend on homework each day. Minutes frequency x x - μ (x - μ)² x² 0-14 2 15-29 4 30-44 10 45-59 16 60-74 6 75-89 2 Table 1 a. Fill in the blank in Table 1 (16 marks) b. Calculate Variance. (2 marks) c. Calculate Standard Deviation. (2 marks) (Total : 20) 2. Find the standard deviation for the following frequency distribution. Length (mm) frequency 10-12 3 13-15 6 16-18 12 19-21 9 22-24 2 Table : 2 (10 marks)
Sri K.
The weekly time spent (in hours) on homework for 18 randomly selected high school students are: 12.0, 11.3, 13.5, 11.7, 12.0, 13.0, 15.5, 10.8, 12.5, 12.3, 14.0, 9.5, 8.8, 10.0, 12.8, 15.0, 11.8, 13.0. (1) Find the sample mean. (2) Find the sample standard deviation. (3) Construct a 99% confidence interval for the population mean. Assume the population is normally distributed.
Ajiboye T.
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD