Monday

May 25, 2015

May 25, 2015

Number of results: 291

**statistics**

survey revealed two percent of students did not select stat. for biz. suppose we select a sample of 10 students. -what is the probability that 3 students selected stat. for biz? -how many students would you expect to select stat.for biz?
*March 8, 2010 by nora*

**Check answers please Statistics**

Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent =15.16 2) one student is absent =30 3) three student is absent =...
*April 8, 2013 by Chris*

**Math Help **

Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent 2) one student is absent 3) three student is absent 4) at least ...
*April 8, 2013 by Chris*

**math**

The probability that a person has immunity to a particular disease is 0.3. Find the mean and standard deviation for the random variable x, the number of people who have immunity in samples of size 28. This is a binomial distribution. mean= 28*.3 standard deviation= sqrt (28*.3...
*August 18, 2007 by manny*

**Prob/Stat**

If P(A) = .3 and P(B) = .4 and P(AandB) = .2 what is P(A/B)? P(B/A)? Are A and B indepentent?
*April 1, 2012 by Sheila*

**Stat**

P(A)=.10, P(B)=.30, P(C)=.40, P(D)=.10, P(F)=.10. Determined the expected grade and variance for the course.
*April 17, 2011 by RB*

**stat **

I posted a question but never got an answer.
*October 20, 2010 by jackie*

**chemistry**

which element has the ground-stat electron configuration [Ar]4s^2 3d^10?
*October 20, 2010 by Raynique*

**STAT**

A random variable X2 assumes only positive value.?
*October 11, 2011 by azriel ed pagayunan*

**stat**

When rolling a die, is this an example of a discrete or continuous random variable?
*June 17, 2013 by Bruce*

**juvenile deliquency**

Compare and contrast the stat and local diversionary programs
*June 1, 2014 by Starr*

**probability**

A coin is biased such that a head is thrice as likely to occur as a tail. Find the probability distribution of heads and also find the mean and variance of the distribution when it is tossed 4 times. See http://www.stat.yale.edu/Courses/1997-98/101/binom.htm Let p be the ...
*January 21, 2007 by mohsin*

**Stat B**

How many standard deviations away from the mean do the quartiles lie in any normal distriubiton?
*September 17, 2009 by Stat B*

**stat**

Standard deviation for the following sets and compare the differences. first 7 #'s 57 61 57 57 58 57 61 second 7#'s 61 52 69 64 46 54 47
*April 12, 2010 by Dannette Fulcher *

**stat**

The total area under the normal distribution curve is equal to a probability of____
*May 7, 2012 by Nichole*

**Stat**

Please help with this problem, not sure calculate it. Consider the standard normal distribution and find P(-1.5 < Z < 2.35).
*December 14, 2012 by Annie*

**stat math**

Stat hw question help me please? In a high profile murder case a sample of the general public's opinions concerning the guilt or innocence of the defendant is taken. A sample of n=100 males results in 62% of the respondents beliving that the defendant is guilty, while a sample...
*February 1, 2009 by helga*

**health**

what is a catchy starting sentence to stat talking about " hip replacement system recall"?
*September 7, 2010 by harrison*

**stat**

couple plans to have four children what is the probability that three are girls and one is a boy
*January 26, 2014 by jerry*

**Math(Stat)**

If the tube were guaranteed to last for 600 hours, what percent of the tubes may have to be replaced under the guarantee
*November 25, 2011 by Anonymous*

**STAT**

Let X be equal to the number of heads from tossing a coin twice. Verify that the following is the probability mass function of x. p(X x)=1/2(2-x)x!
*April 30, 2012 by Michelle*

**STAT**

Determine the mean and standard deviation of the random variable for which the probability mass function is defined as follows: P(X=x)= x-2/30 if x=3,12,21
*May 1, 2012 by Michelle*

**Stat**

What particular measure of correlation would be most appropriate for use with two variables measured at an ordinallevel?
*December 4, 2012 by Rolando*

**stat**

if the heights of men follow a normal distribution, and 99.7% fall between 5" and 7" what is the estimate standard deviation of the height?
*February 2, 2013 by lena*

**STAT**

Explain what each of the three most widely used measures of central tendency indicate to a psychological researcher.
*September 9, 2013 by Jaky*

**Stat**

three identical chips, each with 0 on one side and 1 on the other, are the tossed simunltaneously. a. write the sample space
*June 30, 2014 by cee*

**Stat**

In statistic regressions, does "standard error" mean the residual (vertical distance of each point from teh regression line)?
*November 16, 2008 by Guy*

**Stat**

the teacher wants me to make a survey questions about a sample and get a statistical data from it, how? including variance and standard deveriation. thanks
*December 30, 2008 by Omar*

**Stat College**

what proportion of a normaql distribution is located between each of the following z- score boundaries? a. z= -0.50 and z = +0.50 b. z= - 0.90 and z= +0.90 c. z= -1.50 and z= +1.50 How will I know the question has been answered
*October 20, 2010 by John*

**HIT stat**

Present, in your own words, how information systems help support the risk management function of a healthcare organization
*June 10, 2013 by pj*

**statistic**

A power model is shown below. Determine the residual for the observed data x = 7 and y = 70. stat answer question 9 (1 point) 71.37 1.37 1.85 –1.37
*December 15, 2013 by helen*

**stat**

a sample of 150 adults is composed of 100 women and 50 men. estimate the standard error of the proportion for the female population
*November 9, 2010 by suzanne*

**stat**

a how to solve the problem when on 100 point examination with mean 60, SD 10, if there are 5% A, 5% F, 15% B, 15% D, and 60% C, find the scores that devide the distribution into those catagories.
*August 7, 2011 by B*

**stat**

Find the area under the standard normal curve to the left of z = 1.88, P(z < 1.88). (Give your answer correct to four decimal places.)
*July 7, 2012 by janet*

**grammer**

after graduating from te dog acadeny wivues decide to stat is own rock and roll band identify declarative or interrogative
*March 3, 2011 by Anonymous*

**stat**

2. You just bought a used truck for $10,000 and it loses value at a rate of 10% per year. What is it worth two years later?
*December 6, 2014 by jeudi*

**intermediate algebra**

Solve uing the subtitution method. Show your work. If the system has no solution or an infinite number of solutions, stat this,3x-15y=-12 3x+24y=-12
*July 30, 2011 by ROCKY*

**Stat**

a large no. of bonobos were found to be normally distributed with a mean of 46 and a variance equal to 9. if each of their scored is increased by 5 points, what percentage of the new scores is less than 50?
*January 17, 2012 by Jenny*

**stat**

Given the Variable X measured at a Nominal Level, what descriptive statistical indice would you give if asked to provide the most representative value of the se
*September 26, 2013 by Anonymous*

**stat**

Explain why using the t statistic may be an appropriate alternative to using a z-score
*February 5, 2013 by Tracy*

**stat**

A set of n = 5 pairs of X and Y values has SX = 10, SY = 20, and SXY = 10. For this set of scores, what is the value of SP?
*April 18, 2013 by andrea*

**stat**

Find the sample variance s2 for the following sample data. Round your answer to the nearest hundredth. x: 23 17 12 35 29
*February 6, 2011 by jackie*

**stat**

A sample consists of the following data 7,11,12,18,20,22,25. What is the sample variance?
*December 11, 2012 by christopher*

**stat**

Help my name is Gee and i have posted several question on and ive waited for help and no one will answer can someone please assist me. My post were on Sept 13 and 18 2012 thank you
*September 20, 2012 by Gee*

**Stat**

when you are comparing two sets of data, and one set is strongly skewed and the other is symmetric, which measures of the center and variation should you choose for the comparison?
*September 14, 2014 by jojo*

**stat in psyc**

A normal distribution has µ = 80 and standard deviation = 10. What is the probability of randomly selecting a score greater than 90 from this distribution
*March 3, 2013 by shauna*

**stat**

When a confidence interval for a population proportion is constructed for a sample size n = 100 and the value of, p = .4 the interval is based on the (Points : 1)
*January 29, 2012 by Anonymous*

**English**

I need help finding a chart/stat about how many students go for online education instead of face-to-face and the progress of it.
*February 27, 2012 by Anonymous*

**Prob&Stat**

If 52% of the customers at a certain grocery store regularly use coupons, what is the approximate standard deviation of the sampling distribution of the proportion for samples of size 240? 2.1% 3.2% 4.7% 10.4%
*December 14, 2014 by Bailey*

**stat**

a credit card company estimated that 62% if its customers are males. The company is considering a randomly selected sample of five people.
*November 28, 2010 by tanya*

**stat probability**

A coin is tossed 4 times. Find the probability that the 4th toss is a tail, given that the first 3 tosses were all heads.
*April 8, 2013 by Lynn*

**STAT**

The score on a test are normally distributed with a mean of 75 and a standard deviation of 6. If the professor wishes to give A’s to the top 4%, what would be the cutoff score be for A’s?
*October 12, 2013 by Jacky*

**STAT**

If ì1 and ì2 represent the mean depression score for male teens and female teens respectively, which of the following is the appropriate pair of hypotheses in this case? (a) (b) (c) (d) (e) Both (c) and (d) are correct.
*November 15, 2012 by Anonymous*

**Stat**

For a sample of 200 patients diagnosed with allergies, 25 were men. What is the 90% confidence interval for the population proportion? I set this up and got the answer of .087 -.16. The book has .091-.17. Could use help---I must be missing something.
*October 22, 2010 by Lori*

**College Stat**

A pair of fair dice is rolled. What is the probability of each of the following? (Round your answers to three decimal places.) (a) the sum of the numbers shown uppermost is less than 5 and (b)at least one 5 is cast
*September 15, 2012 by Amonymous*

**Stat Help**

The Momoland Springs Company claims that there are at most 1 ppm (parts per million) of benzene in their water. Test at a=.10 n=25 = 1.10 ppm s = .20 ppm
*November 6, 2012 by Justin*

**stat**

please help!! pretty please!! i need to know how to this problem ASAP! suppose you pay $1.00 to roll a fair die with the understanding that you will get back $3.00 for rolling a 5 or a 1, nothing otherwise. what is your expected value?
*April 12, 2010 by anonymous*

**stat probability**

The number of movies shown in different theatres on Saturday morning in a small city is given in the following. x P(x) 1 0.15 2 0.20 3 0.30 4 0.10 What is the mean distribution (or expectation) of the data given above?
*April 8, 2013 by Lynn*

**stat**

given an exponential distribution with mean = 30 what is the probability that the arrival time is a) less than X = 0.1 B) greater than X = 0.1 c) between X=0.1 and X =0.2 d) less than X =0.01 or greater than X = 0.2
*January 11, 2011 by charles*

**STAT 250..Help!**

What is the probability of randomly selecting a z-score less than z = 0.80 from a normal distribution? a)-0.2119 b)0.7881 c)0.2119 d)-0.7881
*March 20, 2013 by Jane Segurra*

**please answer simple stat any tutor**

mu1 - mu2 >0 is a two tail test or right tail test??
*May 23, 2013 by Anonymous*

**STAT 250..Help!**

What is the probability of randomly selecting a z-score less than z = –0.80 from a normal distribution? a)-0.2119 b)0.7881 c)0.2119 d)-0.7881
*March 20, 2013 by Jane Segurra*

**prob. & stat**

A traveler has 7 pieces of luggage. How many ways can he select 3 pieces of luggage for a trip? a. 5040 b. 210 c. 35 d. 28
*April 1, 2015 by sweet12*

**stat probability**

Find the mean of the distribution shown. x 2 5 7 P(x) 0.28 0.42 0.30 What is the mean and the standard deviation of this distribution?
*April 8, 2013 by Lynn*

**Stat**

α=0.05 for a two-tailed test. Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis. Is the correct answer +/- 1.96?
*September 30, 2014 by Anonymous*

**stat**

The emission of 10 engines is found to be: 15.6, 16.2, 22.5, 20.5, 16.4, 19.4, 16.6, 17.9, 12.9, 13.9. The mean emission must, according to regulations, be u (mean) greater than 20 parts per million. Test this at a significance level of a equal to 0.01
*August 23, 2014 by Nandy *

**prob. & stat**

A group of 150 students were asked to identify 55 flowers. The relative frequency table shows the results. About how many students identified at least 42 flowers? 0-6 5 7-13 14 14-20 6 21-27 11 28-34 19 35-41 29 42-48 13 49-55 3
*April 1, 2015 by sweet12*

**Stat Help Please**

A linear model can be used to describe the relationship between fuel economy(mpg) and horsepower (hp) for certain automobile models. mpg=46.868-0.0838 hp R^2=75.5% 1) Give the symbol and the value of the correlation coefficient.
*March 12, 2013 by Katy*

**stat**

Draw a vertical line through a normal distribution for each of the following z- score locations. Determine whether the body is on the right or left side of the line and find the proportion in the body. (a). z = 2.20 (b) z = 1.60 (c) z = -1.50 (d) z = - 0.70
*December 19, 2010 by Anonymous*

**Chemistry**

Consider the last electron in B: Values for n,l,and ml of 2,0,0 cannot be used. Why not? so is this the same answer as lithium. The ground stat cant have l=2 since it has no p electrons? Are values of 3,0, 0 allowed? Why or why not? I would say no for the same reason. Are ...
*October 31, 2011 by Hannah*

**world history**

How do I find the racial/ethnic, lanuage, and religious demographics of a popluation of 6 million This site lists all of that information about the countries and territories of the world. https://www.cia.gov/cia/publications/factbook/index.html Thank you for using the Hiskha ...
*August 26, 2006 by bryan*

**College Stat**

Draw a vertical line through a normal distribution for each of the following z- score locations. Determine whether the body is on the right or left side of the line and find the proportion in the body. (a). z = 2.20 (b) z = 1.60 (c) z = -1.50 (d) z = - 0.70
*October 19, 2010 by jackie*

**stat probability**

A multiple choice quiz consists of 20 questions, each with 3 possible equally likely answers. If a student guesses at the answer to each question, then the mean number of correct answers selected by the student is?
*April 8, 2013 by Lynn*

**stat**

EXERCISE: THE MULTIPLICATION RULE (4 points possible) Are the following statements true or false? (Assume that all conditioning events have positive probability.) P(A∩B∩Cc)=P(A∩B)P(Cc∣A∩B)
*February 17, 2014 by vlad*

**STAT**

A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 70% of the questions correct
*February 20, 2015 by Cathy*

**Math**

The mean time to complete a certain stat quiz is 25 minutes, with a standard deviation of 5 minutes. Find the probability of a student taking. 1.) less than 15 minutes. 2.) Between 15 and 25 minutes. 3.)more than 25 minutes.
*April 14, 2013 by John*

**probability and statistics.**

So here I am trying to do my prob/stat homework and I keep coming across this word that I don't understand. The word is "inferior". My book has no glossary and I cannot find a definition that makes sense.Can somebody help me understand?
*January 27, 2011 by penny lane*

**stat**

What is the probability of getting a license plate that has a repeated letter or digit if you live in a state that has four letters followed by three numerals followed by two letters? (Round to the nearest whole percent.)
*February 29, 2012 by d's*

**stat mech**

how to solve this problem 3. Five moles of an ideal monatomic gas with an initial temperature of 127 °C expand and, in the process, absorb 1200 J of heat and do 2100 J of work. What is the final temperature of the gas?
*June 23, 2014 by acinad*

**Stat**

Suppose there are 2 black, 3 white, and 5 red marbles in an urn. You reach in and randomly select 3 marbles without replacement. And let X be the number of black marbles. Find the probability table for X.
*March 4, 2013 by Stephanie*

**Stat**

Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution
*October 1, 2014 by Anonymous*

**stat**

The life (in hours) of a computer processing unit (CPU) is modeled as a weibull random variable with β=3 and α=901 hours. What is the probability that the CPU fails before 458 hours?
*October 24, 2011 by eliseo*

**Stat**

The salaries at a corporation are normally distributed with an average salary of $29,000 and a standard deviation of $4,000. What is the probability that an employee will have a salary between $22,520 and $23,480? Enter your answer rounded to exactly 4 decimal places.
*June 5, 2012 by Sam*

**stat mech**

4. A 4.50-kg block of ice at 0.00 °C falls into the ocean and melts. The average temperature of the ocean is 3.50 °C, including all the deep water. By how much does the melting of this ice change the entropy of the world? Does it make it larger or smaller?
*June 23, 2014 by acinad*

**STAT**

a given normal distribution with u=70 and o=6. a- what is the probability of a randomly drawing a sample of n=9 with a mean graeter than 32? b- what is the probability of a randomly drawing a score that falls between 20 and 35?
*October 24, 2010 by IEN*

**stat**

if the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female.use the normal distribution to approximate the binomial distribution
*June 18, 2012 by veedu*

**stat**

Drawing a spade form a regular deck of playing cards and then drawing another spade from the same deck without replacing the first card is this a independent event?
*September 28, 2014 by Anonymous*

**STAT- important**

What is the difference between normal distribution and approximate normally. Correct me if im wrong but I think the parameters of Normal is X~Normal (mu, standard deviation) but then approx. normal is X~Normal (mu, variation) im just really confused when you use each and such.
*December 18, 2014 by Sarah*

**stat**

1. The amount of pyridoxine (in grams) per multiple vitamin is normally distributed with = 110 grams and = 25 grams. A sample of 25 vitamins is to be selected. So, 95% of all sample means will be greater than how many grams?
*December 1, 2010 by Anonymous*

**stat**

only 65% of climbers reach the summit, a random sample of 16 climbers what is the probability that(A) all 16 reach (B) at least 10 reach (C) no more than 12 reach
*April 2, 2014 by doris*

**Stat**

An insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?
*September 26, 2010 by Lori*

**Stat**

Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution. what formula do i use????
*September 30, 2014 by Billy*

**stat**

A test is composed of six multiple choice questions where each question has 4 choices. If the answer choices for each question are equally likely, find the probability of answering more than 4 questions correctly
*June 13, 2010 by laura*

**Stat**

An instant lottery game gives you probability 0.02 of winning on any one play. Plays are independent of each other. If you play 4 times, the probability (±0.0001) that you win on none of your plays is about
*April 3, 2011 by may*

**Psydag--stat**

An insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?
*September 26, 2010 by Lori*

**mth-stat-help-plz**

In conducting a hypothesis test for the difference in two population means where the standard deviations are known and the null hypothesis is: o H : uA - uB ≥ 0 What is the p-value assuming that the test statistic has been found to be z = 2.52? A) 0.0059 B) 0....
*December 9, 2013 by Lea*

**Res/342 UoP**

Is there step-by-step examples to compute these problems using data analysis (ANOVA) and mega-stat? Thx Applied Statistics in Business and Economics: o Chapter 11, Exercises 11.24 and 11.30 o Chapter 15, Exercises 15.29 and 15.32
*April 30, 2012 by Marvin*

**Stat Help Please**

Yearly stock returns on India's Sensex Index are well described by a Normal model with a mean of 18.36% and a standard deviation of 14.65%. give the stock return cutoff for the middle 30% of all years. I used TI-83 Calc. for these. Can someone check them? Thank you! Q1=InvNorm...
*March 10, 2013 by Taylor*

**STAT**

Assume that women’s heights are normally distributed with a mean given by µ = 64.6 inches and standard deviation given by σ = 2.2 inches. What area under the normal curve corresponds to the probability that a woman’s height is between 63.7 inches and 64.7 inches?
*October 12, 2013 by Jacky*

**STAT**

The weights of the 100 students in an introductory statistics class are normally distributed, with a mean of 170 pounds and a standard deviation of 5 pounds. How many students would you expect to have weight between 162 pounds and 178 pounds?
*October 12, 2013 by Jacky*