# random

4,638 results, page 37

### math check and help

A random sample of the amount paid (in dollars) for taxi fare from downtown to the airport was obtained. (Give your answers correct to two decimal places.) 16 17 22 13 21 23 22 18 13 22 19 20 19 22 16 (a) Use the data to find a point estimate for the mean. \$ 18.87 . (b) Use ...

### statistics

A random sample of 31 people employed by the Florida state authority established they earned an average wage (including benefits) of \$56 per hour. The sample standard deviation was \$6.35 per hour. (a)What is your best estimate of the population mean? (b)Develop a 99 percent ...

### statistics

5. The table below shows Psychology exam scores, Statistics Exam scores, and IQ scores for a random sample of students. What can you observe in the relationship between IQ and psychology, psychology and statistics, and IQ and statistics? Using a web-calculator, obtain the ...

### statistics

every year thousands of students take the SAT'S. Recent trends show that the scores on the verbal section follow an approx. normal distribution with mean of 350 and stand. deviation of 110 A)a student is chosen at random. it is noted that only 8% of students have scored higher...

### Statistics

What price do farmers get for their watermelon crops? In the third week of July, a random sample of 52 farming regions gave a sample mean of = \$6.68 per 100 pounds of watermelon. Assume that is known to be \$1.94 per 100 pounds. A farm brings 35 tons of watermelon to market. ...

### Statistics

Mortgage Rates In 2001, the mean contract interest rate for a conventional 30-year first loan for the purchase of a single-family home was 6.3 percent, according to the U.S. Federal Housing Board.A real estate agent believes that interest rates are lower today and obtains a ...

### Math Binomial theorem

I'm preparing for a test and one of the questions in my text is as follows: In a trivia contest,Sam has drawn a topic he knows nothing about, so he makes random guesses for the 10 T/F questions. Use the binomial theorem to help find a)the number of ways Sam can answer the test...

### math

Suppose 10% of the flights arriving at an airport arrive early, 60% arrive on time, and 30% arrive late. Valerie use the random number table to find the experimental probability that of 5 flights, at least 2 will arrive late. The digit 0 represents flights arriving early. The ...

### statistics

A committee of three people is to be formed. The three people will be selected from a list of five possible committee members. A simple random sample of three people is taken, without replacement, from the group of five people. Using the letters A, B, C, D, E to represent the ...

Hello, I'm struggling trying to find the answer for b. Do you know the answer and help would greatly be appreciated! A clean air standard required that vehicle exhaust emissions not exceed specified limits for various pollutants. Many states require that cars be tested ...

### math help

"Three cards are randomly selected from a standard 52-card deck. What is the probability of getting 3 hearts or 3 numbers less than 6 (count aces as 1)?" I think the answer is 0.0645, but I'm not sure if this is right. Could someone check this? "Half of a circle is inside a ...

### Statistics

Hello. I would like to ask a college statistics question. Q. One hundred draws are made at random with replacement from the box [1,2,2,5]. The draws come out as follows:17 [1]'s, 54 [2]'s, 29 [5]'s. Fill in the blanks, using the options below; show work. (a) For the _______, ...

### Biology

True or false? (if false, replace word in *here*) 1) The random changes of allele frequencies associated with genetic drift frequently lead to a *gain* in genetic diverse. 2) *sexual selection* helps maintain the Hb^a/Hb^s heterozygous conditions in humans. 3) bottleneck and ...

### Probability and Statistics

The proportion of adults living in a small town who are college graduates is estimated to be p = 0.6. To test this hypothesis, a random sample of 15 adults is selected. If the number of college graduates in the sample is anywhere from 6 to 12, we shall not reject the null ...

### statistics

The Medical Rehabilitation Foundation reports that the average cost of rehabilitation for stroke victims is at least \$24,500. To see if the average cost might be different at a particular hospital, a researcher selects a random number sample of 50 stroke victims and finds that...

### STATS PROBABILITY

AFTER A TRIP TO THE MARKET, GINA PUTS TOGETHER BOUQUETS BY DRAWING AT RANDOM FROM HER PILE OF FLOWERS WHICH CONTAIN THE FOLLOWING, LAVENDER ROSES 12, RED ROSES 12, WHITE LILIES 6, YELLOW CARNATIONS 18, RED TULIPS 24 AND 12 WHITE TULIPS. a) if gina draws a flower from her pile...

### Statistics

In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 25 patients using the drug is selected. Find the mean and standard deviation of patients having a mild side effect. Mean = np = 25(.2) = 5 Ok Standard ...

### geometry

So On the first day of school I went to geometry and we did a review. My teacher had us work out this problem and I've never seen it before. Other kids were doing the problem and I was just there confused. I was embarrassed and didn't want to ask for help. Do any of you have ...

### Environmental Science

We are using Chi Squares to understand if descrepancies in aniaml populations are random or significant. On the developed land, 20 traps were set. 7 Road runners were caught, and two were marked. On the Undeveloepd land, 20 traps were also set, but 11 Road Runners were caught ...

### statistics

. As a part of their customer-service program, United Airlines wanted to select 10 passengers from today's 9 A.M. Chicago-Tampa flight to be interviewed regarding airport facilities, service, and amenities in the waiting area. Each passenger was given a number on check in, ...

### Math Help

At summer camp 20% of the students come from out of state. Megan wants to simulate cabins of 8 campers. She generates random digits from 0 to 9 and lets the digits 0 and 1 represent a camper from out of state. The table: 69531217; 89542756; 89001254; 01346895; 12468503 ...

### Statistics

A tax specialist knows that tax refunds for people who use a firm to do their tax returns are normally distributed with a mean of \$150 and a standard deviation of \$43. The specialist believes that the company, Taxco, uses under trained staff and gets a lower average tax refund...

### Statistics

A tax specialist knows that tax refunds for people who use a firm to do their tax returns are normally distributed with a mean of \$150 and a standard deviation of \$43. The specialist believes that the company, Taxco, uses under trained staff and gets a lower average tax refund...

### Math

A bag holds 20 yellow mints and 80 other green or pink mints. You choose a mint at random, eat it, and choose another. a. Find the number of pink mints if P(yellow then pink) = P(green then yellow). b. What is the least number of pink mints if P(yellow then pink) > P(green ...

### Algebra

A bag holds 20 yellow mints and 80 other green or pink mints. You choose a mint at random, eat it, and choose another. Find the number of pink mints if P(yellow then pink) = P(green then yellow). What is the least number of pink mints if P(yellow then pink) = P(green then ...

### Stats

A study of the students taking distance learning courses at a university finds that they are mostly older students not living in the university town. Choose a distance learning student at random. Let A be the event that the student is 25 years old or older and B the event that...

provide a situation when scientific method, case study method, survey method, Naturalistic observation method, Correlation method, and Experimental method could be applied scientific= collecting dna case study= Where the psychologist asks the patient of the back ground history...

### Statistics

A number of people were asked how many days they would wait to seek medical treatment if they were suffering pain that interfered with their ability to work. The results are presented in the following table. Number of days: 0 , 1 , 2 , 3 , 4 , 5 Frequency: 27 , 363 , 236 , 107...

### Probability

A drug company claims that a new headache drug will bring instant relief in 90% of all cases. If a person is treated with a placebo, there is a 20% chance that the person will feel instant relief. In a clinical trial, half the subjects are treated with the new drug and the ...

### statistics

After years of data collection by college students, it has been determined that the distribution of course grades in Ms. Green’s Statistic II class follows a normal distribution with a mean of 62 and a standard deviation of 14. (a) A student will pass Ms. Green’s course if...

### math

Jenny places 100 pennies on a table, with 30 showing heads and 70 showing tails. She chooses 40 distinct pennies uniformly at random and turns them over. That is, if a chosen penny was showing heads, she turns it to show tails; if a chosen penny was showing tails, she turns it...

### Statistics

A study of reading ability in schoolchildren chose 60 fifth-grade children at random from a school. The researchers had children's scores on an IQ test and on a test of reading ability. An eccentric professor has his own idea of the relationship between IQ and reading scores. ...

### math (ms sue)

Suppose that one voter in the 2010 UK General Election was selected at random. The probability that the person voted for the Conservative Party was 0.36, the probability that the person voted for the Labour Party was 0.29, and the probability that the person voted for the ...

### statistics

1. An LU professor is interested in whether there is a difference between undergraduate students and graduate students in the amount of time spent praying each day. The professor gathers information from random samples of undergraduate and graduate students on the LU campus. ...

### Math

"In vase A, there are 3 red balls and 5 white balls. In vase B, there are 6 red balls and 4 white balls. Two balls are to be drawn at random, without replacement, from each vase. What is the probability of selecting 4 red balls?" (Answer: 1/28) So I thought about doing 4 cases...

### Probability.. HELP!

At a certain hospital, 40 patients have lung cancer, 30 patients smoke, and 25 have lung cancer and smoke. Suppose the hospital contains 200 patients. If a patient chosen at random is known to smoke, what is the probability of the event that the patient has lung cancer?

### Statistics

A confidence interval was used to estimate the proportion of statistics students that are females. A random sample of 72 statistics students generated the following 90% confidence interval: (0.438, 0.642). Based on the interval above, is the population proportion of females ...

### Statistics

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...

### probability

The bumper car ride at the state fair has 3 red cars, 4 green cars, and 2 blue cars. Joe is first in line for the ride and is assigned a car at random. Bill in next in line and is randomly assigned a car. What is the probability that both joe and bill will drive a red bumper ...

### statistics

The Sledge Tire and Rubber Company plans to warranty its new mountain bike tire for 12 months. However, before it does this, the company wants to be sure that the mean lifetime of the tires is at least 18 months under normal operations. It will put the warranty in place unless...

### Statistics

2. A researcher hypothesized that the pulse rates of long-distance athletes differ from those of other athletes. He believed that the runners’ pulses would be slower. He obtained a random sample of 10 long-distance runners. He measured their resting pulses. Their pulses were...

### statistics

How many TV's are there in your household?” was one of the questions on a questionnaire sent to 5000 people in Japan. The collected data resulted in the following distribution: Number of TVs/Household 0 1 2 3 4 5 or more Percentage 1.9 31.4 23.0 24.4 13.0 6.3 One of these ...

### Statistics

In Los Angeles there are three network television stations, each with it own evening news program from 6:00 to 6:30 PM. According to a report in this morning’s local newspaper, a random sample of 150 viewers last night revealed 53 watched the news on KNBC (channel 2), 64 ...

### Chemistry help

Hey...I just want to make sure my answers to these questions are correct... 1. d=2.507 g/1.22 mL = 2.054918033 g mL^-1 explain how both the rules for significant figures and the random error calculation (p(d) = +-0.34 g mL^-1) indicate that the digits after the hundreths place...

### Math Statistical #2

Research at the University of Toledo indicates that 50 percent of the students change their major area of study after their first year in a program. A random sample of 100 students in the College of Business revealed that 48 had changed their major area of study after their ...

### Math Challenge Check

I am playing a dice game with my friend Kyle. Each of us roles a standard six-side die obtaining a number at random from 1 to 6. What is the probability that my number is greater than Kyle’s number? Answer below was posted last night. Is the answer correct? Will someone ...

### Stats

A public heath official wanted to know how often university students visit their student health centers due to illness or injury. The official took a nationwide random sample of 120 university students and found an average of (x bar) = 2.30 visits per student per year. It is ...

### Stats

The workers union at a certain university is quite strong. About 94% of all workers employed by the university belong to the workers union. Recently, the workers went on strike and now a local TV station plans to interview a sample of 20 workers ,chosen at random to get their ...

### statistics

Suppose that the percentage returns for a given year for all stocks listed on the New York Stock Exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n= 5 stocks from the ...

### Statistics

Suppose that the percentage returns for a given year for all stocks listed on the New York Stock Exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n= 5 stocks from the ...

### Statistics

The inside diameter of the automobile wheel bearing sets at a factory is expected to be normally distributed with a mean of 1.30inches and a standard deviation of 0.04 inches. What is the probability that a randomly selected wheel bearing will have an inside diameter of, a) ...

### statistics

Pleas HeLp!!!!!!!!!! A random sample of the test scores of 100 applicants for college entry at a large junior college showed a mean score of 72.6. Determine a 99%, 95%, and 90% confidence interval for the m mean score of all applicants at the junior college. Assume the ...

### math

You work for a financial information website. You draw a random sample of 100 subscribers and determine that their mean income is \$68,500. Which statement is true? A) You conclude that the income of all subscribers is \$68,500. B) You conclude that half of the subscribes earn ...

### Statistics

A criminologist is studying school violence, she selects a random sample of 25 adolescents aged 12 to 15 from a local middle school and asks the following,"How many times within the past school year have you been physically assaulted at school? She calculated the following ...

### Math

You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is 0.109. How confident can you be that your predicted value will be reasonably close to the actual value? • a) I can’t be confident at ...

### Statistics

Suppose that two different tests A and B are to be given to a student chosen at random from a certain population. Suppose also that the mean score on test A is 85, and the standard deviation is 10; the mean score on test B is 90, and the standard deviation is 16; the scores on...

### math

You are driving a car and the speed is an exponentialy distributed random variable with mean 50 (in miles per hour). The speed limit is 60 miles per hour, and if your speed is x > 60 miles per hour, the probability you are stopped by the police is 1 􀀀 e6􀀀x...

### statistics

Suppose that the percentage returns for a given year for all stocks listed on the new york stock exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n=5 stocks from the ...

### 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 statistics showed that students studied an average of...

### experimental probability

you spin a spinner 50 times. it lands on red 8 times, yellow 12 times, green 20 times, and blue 10 times. based on the results, what is the experimental probility of its landing on green or yellow? thanks I will be happy to critique your work on this. i have a different ...

### Economics (41)

A simple random sample of 60 items resulted in a sample mean of 96. The population standard deviation is 16. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was obtained from a sample of 120 items. ...

### Probability and Statistics

The proportion of adults living in a small town who are college graduates is estimated to be p = 0.6. To test this hypothesis, a random sample of 15 adults is selected. If the number of college graduates in the sample is anywhere from 6 to 12, we shall not reject the null ...

### Probability and Statistics

The proportion of adults living in a small town who are college graduates is estimated to be p = 0.6. To test this hypothesis, a random sample of 15 adults is selected. If the number of college graduates in the sample is anywhere from 6 to 12, we shall not reject the null ...

### Probability and Statistics

The proportion of adults living in a small town who are college graduates is estimated to be p = 0.6. To test this hypothesis, a random sample of 15 adults is selected. If the number of college graduates in the sample is anywhere from 6 to 12, we shall not reject the null ...

### Stat college

It is estimated that 17% of americans have blue eyes. A random sample of 9 americans is selected. Find the probability that the sample includes exactly 2 people with blue eyes. Find the probability that the sample includes at most 2 people with blue eyes. Find the mean number ...

### stats

Time taken in mins for student to walk to school. 1-5 mins (4 students) 6-10 mins (7 students) 11-15 mins (10 students) 16-20 mins (20 students) 21-25 mins (6 students) 26-30 mins (3 students) 1)Estimate the probability that a student selected at random will take at least 21 ...

### Algebra 2-Probability

1. What is the theoretical probability of rolling a sum less than 5 using two number cubes? a.1/6 b.1/4 c.1/2 d.3/4 2. Segments parallel to the sides are used to divide a square board 3 ft on each side into 9 equal-size smaller squares. If the board is in a level position and ...

### math

Fred arrives at the subway station every day at a random time and takes the first train that arrives. If he takes the A train, which arrives each hour on the hour, he ends up at the fitness center. If he takes the B train, which arrives every hour 15 minutes after the A train...

Please check the solution below: X, is assumed to be a random variable by placing letters of the word “YACHT” in a hat. If these letters are withdrawn then it gets replaced. A value of 1 is given when a vowel is retrieved, and a value of 2 is given when a consonant is ...

### Math

You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is 0.109. How confident can you be that your predicted value will be reasonably close to the actual value? A)I can’t be confident at all; ...

### Mathematics

You use a line best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is .793. How confident can you be that your predicted value will be reasonably close to the actual value? A. I can't be confident at all; this ...

### stats again

ok I get it, so once I get the prob figred for one person, how do I figure it if additional attempts are made and the question is about the prob of at least one of the additional attempts say n = 6 getting the same results as the first Once you have the probability of passing ...

### Statistics

I have a question that involves explaining what is wrong in each of the following situations: (a) A random sample of size 20 is taken from a population that is assumed to have a standard deviation of 12. The standard deviation of the sample mean is 12/20. (b) A researcher ...

### math

in a group of 100 people, 40 own a cat, 25 own a dog and 15 own a cat and a dog. Find the probability that a person chosen at random a) owns a dog or a cat b) owns a dog or a cat, but not both c)owns a dog, given that he owns a cat d) does not own a cat, given that he owns a dog.

### Maths

A box contain 40 pens of equal sizes.10 of them are green and 18 are red.if a pen is chosen at random from the box,what is the probability that is neither green nor red? Soln total number of pens=40 number of green pens=10 number of red pens=18 number of other pen=? =10+18=28...

### Math Help

A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 306 lb. and a variance of 2209. (Give your answers correct to four decimal places.) (a) If a truck can carry 3940 lb. and 25 appliances need to be picked up, what ...

### Stats

Recently, a price war has developed among retailers selling Brand X denim jeans. A major chain buyer wishes to estimate the mean price of these jeans during this period to compare it to the normal selling price of \$20.00. A random sample of 7 major retailers produces a mean ...

### Statistics

EU (European Union) countries report that 46% of their labor force is female. The United Nations wants to determine if the percentage of women in the U.S. labor force is the same. Representatives from the United States Department of Labor plan to check a random sample of more ...

### probability

PROBLEM 4: PARKING LOT PROBLEM (3 points possible) Mary and Tom park their cars in an empty parking lot with n≥2 consecutive parking spaces (i.e, n spaces in a row, where only one car fits in each space). Mary and Tom pick parking spaces at random. (All pairs of parking ...

### Sociology (stats) help

Given the mean = \$12 Standard deviation = \$2.50 Suppose that a large state university graduate research assistants are paid by the hour. Data from the personnel office show the distribution of hourly wages paid to graduate students across the campus is approximately normal ...

### Statistics

3. A professor is interested in whether there is a difference in counseling students’ statistics competency scores among 1) those who have never taken any statistics course, 2) those who have only taken an undergraduate statistics course, 3) those who have taken COUN 503, ...

### grid problem (geometry)

The squares of a 2×60 chessboard are coloured black and white in the standard alternating pattern. At random, exactly half of the black squares are removed from the board. The expected number of white squares that have no neighbours after this process can be expressed as a/b ...

### Statistics

Can anyone tell me how to use TI-84 calculator to solve this problem??? A company has developed a new type of light bulb, and wants to estimate its mean lifetime. A simple random sample of 12 bulbs had a sample mean lifetime of 692 hours with a sample standard deviation of 30 ...

### Math

One ball is drawn at random from a bag containing 2 red balls and 8 white balls. (a) What is the probability that the ball is red? Correct: Your answer is correct. (b) What is the probability that the ball is green? Correct: Your answer is correct. (c) What is the probability ...

### Stats

The probability that a person has blue eyes is 16%. Three unrelated people are selected at random. a. Find the probability that all three have blue eyes: b. Find the probability that none of the three have blue eyes c. Find the probability that one of the three has blue eyes

### English III

Which definition below describes stream of consciousness? A. A succession of ideas and images constantly moving forward in time but in a random pattern, represents the mind at work**** B. Reflections on a personal event ordered logically C. A persuasive purpose including ...

### statistics

Each person in random sample of 247 male and 253 female working adults living in Calgary, Canada was asked how long, in minutes, his or her typical daily commute was. use the accompanying summary statistics and an appropriate hypothesis test to determine if there is convincing...

### statistics

M&M’s The candy company claims that 10% of the M&M’s it produces are green. Suppose the candies are packed at random into small bags containing about 25 M&M’s per bag. A class of elementary students learning about percentages opens several bags, counts the various colors...

### statistics

M&M’s The candy company claims that 10% of the M&M’s it produces are green. Suppose the candies are packed at random into small bags containing about 25 M&M’s per bag. A class of elementary students learning about percentages opens several bags, counts the various colors...

### statistics

A certain geneticist is interested in the proportion of males and females in the population that have a certain minor blood disorder. In a random sample of 1500 males, 75 are found to have disorder, whereas 80 of 2000 females appear to have disorder. Find a 90% confidence ...

### Probability

Uncle Henry has been having trouble keeping his weight constant. In fact, during each week, his weight changes from the beginning of the week to the end of the week by a random amount, uniformly distributed between -0.5 and 0.5 pounds. Assuming that his weight change during ...

### Math (Assignment due today)

Assume 11 males audition, one of them being Winston, 4 females audition, one of them being Jackie, and 5 children audition. The casting director has 3 male roles available, 1 female role available, and 2 child roles available. (1)How many different ways can these roles be ...

### STAT

it is estimated that 17% of americans have blue eyes. A random sample of 9 americans is selected. Find the probability that the sample includes exactly 2 people with blue eyes. Find the probability that the sample includes at most 2 people with blue eyes. Find the mean number ...

### math

Can someone please double check my answers (My answers are in Capital) 1. If you produce a million products a day and you want to test ten of them to determine if they are up to standard, which ones will you choose? a. The second ten B. TEN RANDOM UNITS c. The last ten d. The ...

### Discrete Math

12 A computer science department has a probability of 0.35 that a senior receives a job offer in IT before graduation. Random select 8 senior students • What is the probability that 5 students received offers before graduation? • What is the probability only 1 student ...

### stat

the average number of pushups a United States Marine does daily is 300, with a standard deviation of 50. A random sample of 36 marines is selected. What is the probability that the sample mean is at most 320 push-ups? With a mean of 300, you are looking for a sample using a ...

### bus stats

John parks cars at a hotel. On the average, 6.0 cars will arrive in an hour. A driver's decision on whether to let John park the car does not depend upon any other person's decision. Define the random variable X to be the number of cars arriving in any hour period. a. Wat is ...

### Algebra 1

You use a line best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is -0.993. How confident can you be that your predicted value will be reasonably close to the actual value? a. I can't be confident at all; this...

### stat

1. The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected 350 observations from population 1 (dual degree students) and 310 from population 2 (MBA students). The ...