# random

4,731 results, page 3-
## algebra

Which of the following are examples of inferential statistics? Check all that apply. A.Finding the average (mean) of a set of numbers B.Testing every lightbulb produced by a company to confirm that each one works C.Testing random samples of lightbulbs

*asked by daryl on April 18, 2012* -
## Statistics

1. In thinking about doing statistical analysis, the sample mean should be interpreted as: A.)a constant value that is equal to the population mean. B.) a constant value that is approximately equal to the population mean. C.) a random variable that is

*asked by Sara on May 3, 2011* -
## Research Methods

A researcher wants to attain a random sample of young drivers who have received DUIs within the last year. Using the PREP system, he asks all first year students at WLU who have received a DUI to volunteer for the study. Thirty-five students actually admit

*asked by Jill on October 15, 2011* -
## english answer check please, 4 questions

1. To plan your time for a research project, it is best to (1 point) divide the time spent on each step evenly. keep your deadlines flexible. start at the beginning and plan from there.***** work backward. 2. Which of the following is not a guideline for

*asked by Anonymous on March 15, 2017* -
## statistics

Professor Smith conducted a class exercise in which students ran a computer program to generate random samples from a population that had a mean of 50 and a standard deviation of 9mm. Each of Smith's students took a random sample of size n and calculated

*asked by lauren on February 16, 2008* -
## statistics

The average age of statistics students nationwide is 22. The standard deviation is 2.5 years. Assume the age is a normally distributed variable. Find the probability that one student selected at random is older than 23. Find the probability that the mean

*asked by DezShonna K on June 12, 2010* -
## probability

There are 100 people in line to board a plane with 100 seats. The first person has lost his boarding pass, so he takes a random seat. Everyone that follows takes their assigned seat if it's available, but otherwise takes a random unoccupied seat. What is

*asked by unowen on November 23, 2017* -
## probability

If 2 cards are drawn at random from a standard deck of cards with no replacement, find the probability that both cards are heart I had 13/52 multiplied by 12/51 to get an answer of 1/17 A bucket contains 4 red, 2 yellow, and 3 green balls. If one ball is

*asked by Jane on May 15, 2008* -
## probability

This figure below describes the joint PDF of the random variables X and Y. These random variables take values in [0,2] and [0,1], respectively. At x=1, the value of the joint PDF is 1/2. (figure belongs to "the science of uncertainty) 1. Are X and Y

*asked by RVE on February 28, 2015* -
## Statistics

A recent study was designed to compare smoking habits of young women with those of young men. A random sample of 150 women revealed that 45 smoked. A random sample of 100 men indicated that 25 smoked. At the 0.05 significance level does the evidence show

*asked by Brenna on October 30, 2009* -
## Math

Four hundred people apply for three jobs. 130 of the applicants are women. (a) If three persons are selected at random, what is the probability that all are women? (Round the answer to six decimal places.) (b) If three persons are selected at random, what

*asked by Marla on February 4, 2010* -
## Statistics

A person's level of blood glucose and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution

*asked by Alex on June 20, 2010* -
## Probability

Let Θ be an unknown random variable that we wish to estimate. It has a prior distribution with mean 1 and variance 2. Let W be a noise term, another unknown random variable with mean 3 and variance 5. Assume that Θ and W are independent. We have two

*asked by qwerty on April 21, 2015* -
## math

Andre picks a card at random. Without putting the first card back, he picks a second card at random. What is the probability that both cards will be hearts. The cards showing are three hearts and two diamonds

*asked by Olivia on May 8, 2014* -
## statistics

Women’s heights are normally distributed with a mean of 162 cm and standard deviation of 16 cm. a. Define an random variable, X, and describe its full distribution including the mean and variance. b. What percentage of heights are greater than 180 cm ?

*asked by Jasmine on December 5, 2011* -
## probability

The PDF of exp(X) Let X be a random variable with PDF f_X. Find the PDF of the random variable Y=e^X for each of the following cases: For general f_X, when y>0, f_Y(y)= f_X(ln y) --------- y When f_X(x) = {1/3,0,if −2

*asked by RVE on March 26, 2015* -
## math

a bag contains 6 blue marbles and 10 red marbles. If you choose one marble at random, and then another marble at random, what is the probability that both marbles are blue?

*asked by carol on July 22, 2016* -
## math prob

It is known that the number of people who enter a bank during a time interval of t minutes is a Poisson random variable with the parameter t. The bank opens at 8am and you arrive at the bank at uniformly random time between 8am and 9am. Let X be the

*asked by hsuan on May 4, 2013* -
## math

It is known that the number of people who enter a bank during a time interval of t minutes is a Poisson random variable with the parameter t. The bank opens at 8am and you arrive at the bank at uniformly random time between 8am and 9am. Let X be the

*asked by hsuan on May 3, 2013* -
## math

It is known that the number of people who enter a bank during a time interval of t minutes is a Poisson random variable with the parameter t. The bank opens at 8am and you arrive at the bank at uniformly random time between 8am and 9am. Let X be the

*asked by hao on May 3, 2013* -
## MATH

A jar contains 10 green, 6 white, and 11 brown marbles. A marble is drawn at random. P(brown or white) I think 17/27 A number from 16 to 28 is drawn at random. P(an even number) I think 7/13

*asked by Anonymous on March 13, 2014* -
## math0

If you pick a gumball at random, put it back, and then pick another gumball at random, what is the probability of picking a blue gumball then picking a yellow gumball?

*asked by Anonymous on April 21, 2016* -
## math

Please help with this question. A bag contains 10 marbles of which 3 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?

*asked by jackie on July 31, 2010* -
## Probability

Let U, V, and W be independent standard normal random variables (that is, independent normal random variables, each with mean 0 and variance 1), and let X=3U+4V and Y=U+W. Give a numerical answer for each part below. You may want to refer to the standard

*asked by qwerty on April 21, 2015* -
## social psy

I want to utilize a true experimental design to study the effects of classical music exposure on the cognitive development of newborns. a- What is an independent variable? b- What is a dependent variable? c-What is random assignment? d-Why is random

*asked by deb on October 3, 2011* -
## statistics

22. A company is planning to expand its operations. They are currently considering 9 different locations. Two of these are in Ohio. If the locations are selected at random from the 9 locations being considered, the probability of selecting the two sites in

*asked by meri on June 30, 2015* -
## statistics

please help me on this; In the mass production of bolts it is found that 5% are defective. Bolts are selected at random and put into packets of ten. A packet is selected at random. Find the probability that it contains: A. no defective bolts, B. three

*asked by uta on April 13, 2016* -
## math

Consider a 25×25 grid of city streets. Let S be the points of intersection of the streets, and let P be the set of paths from the bottom left corner to the top right corner of which consist of only walking to the right and up. A point s is chosen

*asked by raja harishchandra on June 11, 2013* -
## math

Consider a 25×25 grid of city streets. Let S be the points of intersection of the streets, and let P be the set of paths from the bottom left corner to the top right corner of which consist of only walking to the right and up. A point s is chosen

*asked by anonymous on June 14, 2013* -
## math

Consider a 25×25 grid of city streets. Let S be the points of intersection of the streets, and let P be the set of paths from the bottom left corner to the top right corner of which consist of only walking to the right and up. A point s is chosen

*asked by raja harishchandra on June 13, 2013* -
## maths

*asked by raja harishchandra on June 14, 2013* -
## math

*asked by raja harishchandra on June 12, 2013* -
## math

*asked by raja harishchandra on June 13, 2013* -
## math

A bag contains 5 red and 4 green apples. Michael takes one apple at random from the bag. His sister Ashley then takes an apple at random from he bag. What is the probability that the two apples are the same colour? Can you explain to me how to do this

*asked by Anna on February 8, 2015* -
## statistics

A die has 2 red faces, 2 blue faces, and 2 green faces. It is rolled 240 times. Let R be the number of times red faces appear, and B the number of times blue faces appear. The random variable R is the sum of 240 draws at random with replacement from [pick

*asked by gerd on May 18, 2013* -
## Stats

I just need help with starting how to calculate the problem I am so lost. A random sample of eight observations from the first population resulted in a standard deviation of 10. A random sample of six observations from the second population resulted in a

*asked by Yasmin on December 6, 2010* -
## Stats

Describe how to use a source of random data to simulate multiple trials of this situation. A student guesses on all 10 questions of a multiple-choice quiz. Each question has three choices. a. Assign 00-09 to all of the correct answers and 10-29 for all the

*asked by Bailey on July 29, 2016* -
## stats

Consider an infinite population with 25% of the elements having the value 1, 25% the value 2, 25% the value 3, and 25% the value 4. If X is the value of a randomly selected item, then X is a discrete random variable whose possible values are 1, 2, 3, and

*asked by Mischa on November 6, 2008* -
## math

is this correct? 1.a jar contains 5 white, 15 violet,and 21 blue marbles. a marble is drawn at random. P(violet or white) answer: 5x15x21= 1575 15x5=75 75/1575= 1/21 2. a number from 10 to 16 is drawn at random. P(a number greater than 14) answer: 2/7

*asked by Jane on April 8, 2010* -
## Probability

You have a 4-card deck containing a queen, a jack, a 10, and a 9. You draw a random card, put it back, and draw a second random card. Use a tree diagram to calculate the probability that you draw exactly 1 face card (a queen or a jack). A. 1/2. B. 7/16. C.

*asked by so confused! on May 8, 2013* -
## statistics

A researcher finds that two continuous, random variables of interest, X and Y, have a joint probability density function (pdf) given by: f(x,y)={cxy 0

*asked by lee on November 13, 2014* -
## statistics

A researcher finds that two continuous, random variables of interest, X and Y, have a joint probability density function (pdf) given by: f(x,y)={cxy 0

*asked by sana on November 13, 2014* -
## Probability

In the following problem, please select the correct answer. Let X be a non-negative random variable. Then, for any a>0, the Markov inequality takes the form P(X≥a)≤(a^c)E[X^5]. What is the value of c? c= unanswered Suppose that X_1,X_2,⋯ are random

*asked by AnonStar on March 16, 2018* -
## econ 112

A random sample of 400 morning shoppers showed that 130 were men. A random sample of 480 evening shoppers showed 187 to be men. Use a 5% level of significance to test for a significant difference in the proportion of morning and evening male shoppers. What

*asked by Anonymous on June 28, 2013* -
## maths : probability

We are given a biased coin, where the probability of Heads is q. The bias q is itself the realization of a random variable Q which is uniformly distributed on the interval [0,1]. We want to estimate the bias of this coin. We flip it 5 times, and define the

*asked by Anonymous on December 19, 2018* -
## maTH

I NEED HELP REALLY BAD 5. Directions: Select all the correct answers. Nancy is studying constellations in science class. Two things are strongly supported by all random samples of the number of stars in a constellation. Most constellations have from three

*asked by Babatunde on May 9, 2014* -
## stastic

A can of Coke is supposed to contain, on the average, 16 ounces of soda with a standard deviation of 0.4 ounces. Suspecting fraud, you take a random sample of 50 cans and measure the amount of Coke in each. Your measurements show that the 50 cans had a

*asked by kima on April 18, 2014* -
## Statistic

1. For this assessment, explicityly state the five steps of a simulation and carry out the simulation. Use the random digit table. A basketball player makes 80% of her free throws. Recently during a very close game, she shot 5 free throws near the end of

*asked by Helen on January 30, 2014* -
## Stats

The random variable U has mean 10 and standard deviation 5.The random variable V is de ned by V =12(U + 5).Find the mean and standard deviation of V.

*asked by Sunny on November 20, 2013* -
## Applied Stats

Based on the data collected by the National Centre for health Statistics and made available to the public in the Sample Adult database, it was found that the percentage of adults who have at some point in their life been told that they have hypertension

*asked by Anonymous on August 8, 2016* -
## math

A basket contains 11 pieces of fruit: 4 apples, 5 oranges, and 2 bananas. Jonas takes a piece of fruit at random from the basket, and then Beth takes a piece at random. What is the probability that Jonas will get an orange and Beth will get an apple?

*asked by stephanie on October 13, 2011* -
## algebra

A basket contains 11 pieces of fruit: 4 apples, 5 oranges, and 2 bananas. Jonas takes a piece of fruit at random from the basket, and then Beth takes a piece at random. What is the probability that Jonas will get an orange and Beth will get an apple?

*asked by den on January 21, 2011* -
## math

A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?

*asked by babygirl on March 9, 2010* -
## Algebra

a bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?

*asked by Joe on July 23, 2009* -
## Math probability

A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?

*asked by nicole on April 11, 2010* -
## Maths A

For this question, use the copy of the Random Number table provided at the end of this AAT. (This table was copied from page 111 in the Textbook.) Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range

*asked by Anna on February 25, 2013* -
## math - classifying events

A market survey has estimate that the probability of a household's subscribing to the following magazines is: Reader's Digest - 0.6 Chatelaine - 0.5 Maclean's - 0.4 Reader's Digest and Chatelaine - 0.2 Reader's Digest and Maclean's - 0.2 Chatelaine and

*asked by CL on May 6, 2010* -
## math

A drawer contains 4 red socks, 3 white socks, and 3 blue socks. without looking, you select a sock at random, replace it and seect a sond sock at random. what is the probablity that the first sock is blue and the second sock is red?

*asked by Melanie on May 21, 2012* -
## stats

A random sample of 50 households in community A has a mean household income of X =Rs. 44,600 with a standard deviation s =Rs. 2,200. A random sample of 50 households in community B has a mean of X = Rs. 43,800 with a standard deviation of Rs. 2,800.

*asked by Anonymous on June 20, 2014* -
## statistics

Scores on a national writing exam are approximately normally distributed, with a mean of 490 and a standard deviation of 20. Consider random samples of size 25 from the population of test takers. describe the sampling distribution of a sample mean. shape

*asked by ivan on October 17, 2014* -
## Stat

A random sample of 50 households in community A has a mean household income of X- =Rs. 44,600 with a standard deviation s =Rs. 2,200. A random sample of 50 households in community B has a mean of _X = Rs. 43,800 with a standard deviation of Rs. 2,800.

*asked by Faheem on June 2, 2014* -
## probability

Exercise: Sections of a class A class consists of three sections with 10 students each. The mean quiz scores in each section were 40, 50, 60, respectively. We pick a student, uniformly at random. Let X be the score of the selected student, and let Y be the

*asked by RVE on March 14, 2015* -
## statistics

Question 6: A manufacturer knows that the number of items produced per hour by its two factories A and B is normally distributed with standard deviations 8.0 and 11.0 items respectively. The mean hourly amount produced by Firm A from a random sample of 50

*asked by molebogeng on April 12, 2012* -
## intro to statistics

A random study of recent graduates' average grades and degrees showed the following results. Grade Degree C B A B.S. 6 9 13 B.A. 5 12 10 If a graduate is selected at random, find these probabilities. 1.The graduate has a B.S. degree, given that he or she

*asked by Mark Jessen on December 9, 2011* -
## probability

FUNCTIONS OF A STANDARD NORMAL The random variable X has a standard normal distribution. Find the PDF of the random variable Y, where: 1. Y=3X-1 , Y = 3X - 1 answer: fY(y)=1/3*fX*(y+1/3) f_ Y(y)=1/3*f_ X*(y+1/3) 2. Y=3X^2-1. For y>=-1, Y = 3X^2 - 1. For y

*asked by RVE on March 18, 2015* -
## math

A bag has 4 red marbles, 4 blue marbles, and 2 green marbles. Jessie draws a marble from the bag at random, notes the color, and then replaces the marble.She then draws a second marble at random.What is the probability that both the marbles are green? a.

*asked by thomas on April 17, 2014* -
## statistics

Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for the Vanguard Total Stock Index (all Stocks). Let y be a random variable representing annual return for the Vanguard Balanced

*asked by Karen on August 18, 2010* -
## Stat

Does anyone know how to solve for this Suppose that a principal of a local high school tracks the number of minutes his students spend texting on a given school day. He finds that the distribution of minutes spent texting is roughly normal with a mean of

*asked by jen on April 23, 2016* -
## math

A farmer is using a random sample to predict the number of broken eggs in a shipment of 3,000 eggs. Using a calculator, the farmer generates the following random numbers. The numbers 1-250 represent broken eggs. 477, 2116, 1044, 81, 619, 755, 2704, 900,

*asked by Tim on March 5, 2016* -
## Math

2. The following is a random sample of grades achieved on statistics examination by 10 male students in a very large class and a random sample of grades achieved by 8 female students. Male 78 87 75 64 90 80 65 86 74 81 Female 71 50 80 75 90 61 85 81 Test

*asked by Paulo on July 10, 2016* -
## statistics

Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that

*asked by sarah on May 20, 2013* -
## statistics

Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that

*asked by sarah on May 20, 2013* -
## Math (Probability)

In a random poll of science students, it was determined that 90% of students submitted tests before the deadline. In a random sample of 75, what is the probability that exactly 10 submitted after the deadline? What is the probability that less than 10

*asked by Meghan on August 20, 2015* -
## maths

*asked by rishabh on June 11, 2013* -
## probablity

We are given a biased coin , where the probability of heads is q. he bias q is itself the realization of a random variable Q which is uniformly distributed on the interval [0,1]. We want to estimate the bias of the coin. We flip it 5 times, and define

*asked by Anonymous on December 23, 2018* -
## math *check*

11. A basket contains the following pieces of fruit: 3 apples, 2 oranges, 2 bananas, 2 pears, and 5 peaches. Jonas picks a fruit at random and does not replace it. Then Beth picks a fruit at random. What is the probability that Jonas gets a peach and Beth

*asked by Me on June 11, 2014* -
## Probability

This figure below describes the joint PDF of the random variables X and Y. These random variables take values in [0,2] and [0,1], respectively. At x=1, the value of the joint PDF is 1/2. Are X and Y independent? - unanswered Yes No Find fX(x). Express your

*asked by ubn on March 18, 2015* -
## math

a drawer contains 2 red socks, 5 white socks, and 6 blue socks. without looking, you select a sock at random, replace it, and selecct a second sock at random. what is the probability that the first sock is blue and the second sock is red?

*asked by Taylor on May 24, 2012* -
## math

The Gallup Poll uses a procedure called random digit dialing, which creates phone numbers based on a list of all area codes in America in conjunction with the associated number of residential households in each area code. Give a possible reason the Gallup

*asked by wendy on January 11, 2017* -
## Statistics

n order to study the amounts owed to the city council, a city clerk takes a random sample of 16 files from a cabinet containing a large number of delinquent accounts and finds the average amount owed to the city to be $231. It has been claimed that the

*asked by Dick on May 24, 2011* -
## Math

On a certain road 20% of the vehicles are trucks, 16% are buses and the remainder are cars. (i) A random sample of 11 vehicles is taken. Find the probability that fewer than 3 are buses. [3] (ii) A random sample of 125 vehicles is now taken. Using a

*asked by Josh on April 8, 2011* -
## math

There are two jars, A and B. Jar A contains 7 red and 2 blue marbles, while jar B contains 5 red and 4 blue marbles. You roll a fair die.If you get a 2 or a 3, you pick a random marble from jar A and put it in jar B. You then pick a random marble from jar

*asked by daniel johnson on February 4, 2016* -
## prob. & stat

In a random sample of 63 women at a company, the mean salary is $48,902 with a standard deviation of $5270. In a random sample of 50 men at the company, the mean salary is $53,454 with a standard deviation of $4677. Construct a 95% confidence interval for

*asked by sweet12 on May 10, 2015* -
## prob & stat

In a random sample of 63 women at a company, the mean salary is $48,902 with a standard deviation of $5270. In a random sample of 50 men at the company, the mean salary is $53,454 with a standard deviation of $4677. Construct a 95% confidence interval for

*asked by sweet12 on May 10, 2015* -
## stats please help test tom

When a computerized generator is used to generate random digits, the proability that any particular digit in the set {0,1,2, . . .,9} is generated on any individual trial is 1/10-0.1. suppose that we are generating digits one at a time and are interested

*asked by david on January 25, 2007* -
## QSO 510

During the dinner hour, the distribution of the inter-arrival time of customers at a restaurant is estimated to be as shown below. The mode of payment and the service times of the cash and credit card customers are shown in the following tables. Complete

*asked by Anonymous on March 19, 2013* -
## Statistics

Problem During the dinner hour, the distribution of the inter-arrival time of customers at a restaurant is estimated to be as shown below. The mode of payment and the service times of the cash and credit card customers are shown in the following tables.

*asked by Anonymous on March 17, 2013* -
## Calculus

According to the National Health Survey, the heights of adult males in the United States are normally distributed with mean 69.0 inches and standard deviation 2.8 inches. A. What is the probability that an adult male chosen at random is between 61 inches

*asked by Robin on November 3, 2013* -
## math

Suppose that n tennis players want to play an elimination tournament. That means: they pair up, at random, for each round; if the number of players before the round begins is odd, one of them, chosen at random, sits out that round. The winners of each

*asked by Hi on February 20, 2012* -
## Probability

Let N be a geometric r.v. with mean 1/p; let A1,A2,… be a sequence of i.i.d. random variables, all independent of N, with mean 1 and variance 1; let B1,B2,… be another sequence of i.i.d. random variable, all independent of N and of A1,A2,…, also with

*asked by A on April 3, 2014* -
## stats

On a test of motor coordination, the population of average bowlers has a mean score of 24, with a standard deviation of 6. A random sample of 30 bowlers at Fred's Bowling Alley has a sample mean of 26. A second random sample of 30 bowlers at Ethel's

*asked by lisa on February 8, 2015* -
## Math

On a test of motor coordination, the population of average bowlers has a mean score of 24, with a standard deviation of 6. A random sample of 30 bowlers at Fred's Bowling Alley has a sample mean of 26. A second random sample of 30 bowlers at Ethel's

*asked by Cheryl on October 8, 2015* -
## stats again please help

When a computerized generator is used to generate random digits, the proability that any particular digit in the set {0,1,2, . . .,9} is generated on any individual trial is 1/10-0.1. suppose that we are generating digits one at a time and are interested

*asked by david on January 23, 2007* -
## Math

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this

*asked by Jen on October 21, 2011* -
## NEED HELP PLZ!!! STATS

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this

*asked by Jennifer on October 24, 2011* -
## statistics

Two cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of Jacks drawn in a set of 2 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this

*asked by mom on October 4, 2012* -
## Stats

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this

*asked by Jennifer on October 23, 2011* -
## statistics

8. Suppose that the IQ score for a person selected from a certain group of people is approximately N(; 100). Let X1;X2; : : : ;Xn be a random sample of such IQ scores. (a) How large should n be so that a 90% con dence interval for with maximum error " =

*asked by rose on December 5, 2012* -
## statistics

A doctor wants to know if her patients are happy with her. She decides to survey a sample of her clients. What method would be best for choosing a random sample that is a fair representation of her patients? A. Assign numbers to each patient and then use a

*asked by Raishawn on July 13, 2014* -
## statistics

drawer contains 50 bolts and 150 nuts. Half of the bolts and half of the nuts are rusted. If one item is chosen at random, what is the probability that it is rusted or a bolt ? In a study to test whether there is a difference between the average height of

*asked by RAJESH on April 14, 2010*