statistics

draw a simple random sample of 15 students from your class,and calculate sample mean and sample variance of their heights(use lottery method)

  1. 👍 0
  2. 👎 0
  3. 👁 166
  1. Find the mean first = sum of scores/number of scores

    Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math I need help ASAP!

    1. which of the following is true of a random sample? a. it is the only way to sample a population. b. each member of the sample is a volunteer. c. it is always the easiest way to sample a population. d. each member of the

    asked by Carolina on May 27, 2015
  2. Statistics

    A 95% confidence interval for a population mean, ?, is given as (18.985, 21.015). This confidence interval is based on a simple random sample of 36 observations. Calculate the sample mean, x ?, and the sample standard deviation,

    asked by Mike on June 18, 2012
  3. Algebra 1

    Can you please check my work? A city planning committee surveys 100 people waiting at a bus stop about the expansion of the public transportation system. Is this an example of a: random sample, systematic sample, self-selected

    asked by Caroline on April 27, 2014
  4. statistics

    A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15. a) Compute the 95 % confidence interval for the population mean. b) Assume that the same sample mean was obtained from a

    asked by TIMBERLY on April 7, 2011
  5. Government

    1) The portion of the population selected to participate in a poll is known as the a. public b. population c. deliberative group d. sample e. focus group 2) A sample that does not overrepresent any portion of the population and

    asked by sam on October 11, 2008
  1. Statistics

    28. A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week. Based on a simple random sample, they surveyed 144 students. The

    asked by Steph on October 22, 2011
  2. Math

    Adam wants to know the mean number of minutes students commuting back and forth to school each day. he selects a sample of 5 students using the random digit table beginning on line 12 shown. Line 12: 29621 66583 62966 12468 20345

    asked by Bonnie on March 17, 2020
  3. Algebra 1

    A city planning committee surveys 100 people waiting at a bus stop about the expansion of the public transportation system. Is this an example of a: random sample, systematic sample, self-selected sample, convenience sample,

    asked by Natalia on January 13, 2017
  4. STAT

    A college faculty consists of 400 men and 250 women. The college administration wants to draw a sample of 65 faculty members to ask their opinion about a new parking fee. They draw a simple random sample of 40 men and another

    asked by CEDRA on June 10, 2014
  5. Math

    Michelle is interested in knowing how often girls in her class at school use their cell phones to instant message their friends. Which of the following methods could Michelle use to conduct a simple random sample to answer her

    asked by Sophia on October 8, 2019
  6. Basic Statistics

    A population of 300 voters contains 147 Republicans, 135 Democrats, and 18 independents and members of other parties. A simple random sample of 30 voters will be drawn from this population. Consider repeatedly drawing simple

    asked by mike on July 24, 2011

You can view more similar questions or ask a new question.