Thursday

April 24, 2014

April 24, 2014

Number of results: 246

**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?
*Monday, March 8, 2010 at 10:47am 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 =...
*Monday, April 8, 2013 at 3:50pm 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 ...
*Monday, April 8, 2013 at 12:44pm 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...
*Saturday, August 18, 2007 at 12:29pm 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?
*Sunday, April 1, 2012 at 8:44am 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.
*Sunday, April 17, 2011 at 8:20pm by RB*

**stat **

I posted a question but never got an answer.
*Wednesday, October 20, 2010 at 12:01am by jackie*

**chemistry**

which element has the ground-stat electron configuration [Ar]4s^2 3d^10?
*Wednesday, October 20, 2010 at 6:30pm by Raynique*

**STAT**

A random variable X2 assumes only positive value.?
*Tuesday, October 11, 2011 at 9:33am by azriel ed pagayunan*

**stat**

When rolling a die, is this an example of a discrete or continuous random variable?
*Monday, June 17, 2013 at 2:12pm by Bruce*

**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 ...
*Sunday, January 21, 2007 at 12:49pm by mohsin*

**Stat B**

How many standard deviations away from the mean do the quartiles lie in any normal distriubiton?
*Thursday, September 17, 2009 at 9:11pm 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
*Monday, April 12, 2010 at 7:49pm by Dannette Fulcher *

**stat**

The total area under the normal distribution curve is equal to a probability of____
*Monday, May 7, 2012 at 7:22pm 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).
*Friday, December 14, 2012 at 8:50am 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...
*Sunday, February 1, 2009 at 9:56pm by helga*

**health**

what is a catchy starting sentence to stat talking about " hip replacement system recall"?
*Tuesday, September 7, 2010 at 4:13pm by harrison*

**stat**

couple plans to have four children what is the probability that three are girls and one is a boy
*Sunday, January 26, 2014 at 9:55pm 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
*Friday, November 25, 2011 at 10:38pm 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!
*Monday, April 30, 2012 at 11:59pm 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
*Tuesday, May 1, 2012 at 12:01am by Michelle*

**Stat**

What particular measure of correlation would be most appropriate for use with two variables measured at an ordinallevel?
*Tuesday, December 4, 2012 at 7:42pm 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?
*Saturday, February 2, 2013 at 7:48pm by lena*

**STAT**

Explain what each of the three most widely used measures of central tendency indicate to a psychological researcher.
*Monday, September 9, 2013 at 5:30pm by Jaky*

**Stat**

In statistic regressions, does "standard error" mean the residual (vertical distance of each point from teh regression line)?
*Sunday, November 16, 2008 at 1:23am 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
*Tuesday, December 30, 2008 at 4:54am 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
*Wednesday, October 20, 2010 at 11:22pm by John*

**HIT stat**

Present, in your own words, how information systems help support the risk management function of a healthcare organization
*Monday, June 10, 2013 at 12:06am 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
*Sunday, December 15, 2013 at 9:21pm 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
*Tuesday, November 9, 2010 at 8:53pm 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.
*Sunday, August 7, 2011 at 6:03pm 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.)
*Saturday, July 7, 2012 at 10:02am by janet*

**grammer**

after graduating from te dog acadeny wivues decide to stat is own rock and roll band identify declarative or interrogative
*Thursday, March 3, 2011 at 12:11am by Anonymous*

**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
*Saturday, July 30, 2011 at 9:38pm 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?
*Tuesday, January 17, 2012 at 8:00am 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
*Thursday, September 26, 2013 at 3:13pm by Anonymous*

**stat**

Explain why using the t statistic may be an appropriate alternative to using a z-score
*Tuesday, February 5, 2013 at 10:05pm 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?
*Thursday, April 18, 2013 at 11:15pm 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
*Sunday, February 6, 2011 at 11:31pm by jackie*

**stat**

A sample consists of the following data 7,11,12,18,20,22,25. What is the sample variance?
*Tuesday, December 11, 2012 at 3:36am 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
*Thursday, September 20, 2012 at 3:14am by Gee*

**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
*Sunday, March 3, 2013 at 11:23pm 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)
*Sunday, January 29, 2012 at 10:33am 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.
*Monday, February 27, 2012 at 8:58pm by Anonymous*

**stat**

a credit card company estimated that 62% if its customers are males. The company is considering a randomly selected sample of five people.
*Sunday, November 28, 2010 at 12:36pm 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.
*Monday, April 8, 2013 at 7:35pm 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?
*Saturday, October 12, 2013 at 12:30pm 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.
*Thursday, November 15, 2012 at 7:55pm 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.
*Friday, October 22, 2010 at 10:54pm 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
*Saturday, September 15, 2012 at 3:46pm 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
*Tuesday, November 6, 2012 at 3:54pm 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?
*Monday, April 12, 2010 at 8:53pm 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?
*Monday, April 8, 2013 at 7:34pm 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
*Tuesday, January 11, 2011 at 12:55am 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
*Wednesday, March 20, 2013 at 8:36pm by Jane Segurra*

**please answer simple stat any tutor**

mu1 - mu2 >0 is a two tail test or right tail test??
*Thursday, May 23, 2013 at 10:54am 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
*Wednesday, March 20, 2013 at 8:35pm by Jane Segurra*

**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?
*Monday, April 8, 2013 at 7:34pm by Lynn*

**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.
*Tuesday, March 12, 2013 at 1:02am 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
*Sunday, December 19, 2010 at 11:35pm 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 ...
*Monday, October 31, 2011 at 11:17am 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 ...
*Saturday, August 26, 2006 at 12:37pm 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
*Tuesday, October 19, 2010 at 11:39pm 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?
*Monday, April 8, 2013 at 7:33pm 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)
*Monday, February 17, 2014 at 8:17pm by vlad*

**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.
*Sunday, April 14, 2013 at 11:41pm 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?
*Thursday, January 27, 2011 at 4:45pm 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.)
*Wednesday, February 29, 2012 at 4:59pm by d's*

**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.
*Monday, March 4, 2013 at 6:26pm by Stephanie*

**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?
*Monday, October 24, 2011 at 1:12pm 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.
*Tuesday, June 5, 2012 at 7:38am by Sam*

**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?
*Sunday, October 24, 2010 at 3:48pm 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
*Monday, June 18, 2012 at 12:20pm by veedu*

**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?
*Wednesday, December 1, 2010 at 7:11pm 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
*Wednesday, April 2, 2014 at 12:52pm 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?
*Sunday, September 26, 2010 at 1:16am by Lori*

**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
*Sunday, June 13, 2010 at 6:35pm 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
*Sunday, April 3, 2011 at 8:14pm 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?
*Sunday, September 26, 2010 at 2:57pm 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....
*Monday, December 9, 2013 at 3:10pm 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
*Monday, April 30, 2012 at 11:10am 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...
*Sunday, March 10, 2013 at 10:31pm 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?
*Saturday, October 12, 2013 at 12:29pm 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?
*Saturday, October 12, 2013 at 12:31pm by Jacky*

**stat/ probability**

The height of males is normally distributed with a mean of 69 inches and a standard deviation of 2.5 inches. What is the probability that the height of a randomly selected male is between 66 and 71 inches?
*Wednesday, August 15, 2012 at 8:35pm by mark*

**stat probability**

At a certain college, there were 780 science majors, 320 engineering majors, and 390 business majors. If one student was selected at random, the probability that they are a business major is?
*Monday, April 8, 2013 at 7:38pm by Lynn*

**stat**

A survey was conducted to study the relationship between the annual income of a family and the amount of money the family spends on entertainment. Data were collected from a random sample of 280 families from a certain metropolitan area. A meaningful graphical display of these...
*Wednesday, January 25, 2012 at 1:27pm by Divine*

**Mega Stat**

How do you know the p-value on megastat. On minitab It looks like it gets a different p-value than megastat. I got a number from megastat of 2.35E10 and on minitab it was 0.000.
*Saturday, February 20, 2010 at 4:46pm by mark*

**stat**

assume that the heights of men are normally distributed with a mean of 68.4 inches and a standard deviation of 2.8 inches.if 64 men are randomly selected, find the probability that they have a mean height greater than 69.4 inches
*Monday, June 18, 2012 at 11:52am by veedu*

**stat**

The general population (Population 2) has a mean of 30 and a standard deviation of 5, and the cutoff Z score for significance in a study involving one participant is 1.96. If the raw score obtained by the participant is 45, what decisions should be made about the null and ...
*Saturday, September 7, 2013 at 9:12am by Jaky*

**Math.stat help :(**

Consider the following hypothesis statement using alpha = .05, and data from two independent samples: Ho: µ1 - µ2 = 0 Ha: µ1 - µ2 not equal to 0 X1 = 237, X2 = 218 ¬1 = 54, ¬2 = 63 n1 = 42, n2 = 35 a) Calculate the appropriate test statistic and interpret the result. b) ...
*Saturday, November 30, 2013 at 1:42pm by Williams*

**Stat Help Please**

Determine which sampling method was used in each scenario. on a particular day 5 flights are selected at random and all of the passengers on these 5 flights are screened. Airport security uses a random number generator to determine the next passenger to screen.
*Saturday, February 23, 2013 at 6:48pm by Melissa*

**Stat Help Please**

Determine which sampling method was used in each scenario. on a particular day 5 flights are selected at random and all of the passengers on these 5 flights are screened. Airport security uses a random number generator to determine the next passenger to screen.
*Saturday, February 23, 2013 at 7:18pm by Melissa*

**statistics**

use technology to find the P-value for a right-tailed test with n=21 and test statistic t=2.065 apparently, i don't have a stat calculator or statistical software to use to find the answer. so i need help how to find it by using the t distribution table..
*Friday, May 21, 2010 at 6:26pm by shasha*

**business stat **

1. Suppose quality control inspectors at the coffee house chain take a sample of 100 pieces of this chocolate product from an incoming shipment. They find a sample average of 60% cacao with a standard deviation of 8%. What is the standard error of the sampling distribution of ...
*Monday, July 23, 2012 at 7:51pm by kristin *

**Stat BHS 201**

find the z- score location of a vertical line that spearates a normal distribution as described in each of the following. a. 20% in the tail on the left b 40% in the tail on the right c 75% in the body on the left d. 99% in the body on the right
*Wednesday, October 20, 2010 at 12:06am by jackie*

**stat counting principles**

telephone numbers for a certain city have exchanges of 584, 545, or 586. each of these exchanges is followed by four digits. how many different telephone numbers are possible for this city? a. 3 * 4 b. 3 * 4 * 10 c. 3 * 10^4 d. 3 * 4^10
*Sunday, January 8, 2012 at 8:21pm by luckybee*

**STAT**

A certain personality index postulated by Professor Bailey is normally distributed, with a mean of 0.4 and a variance of 0.0004. What is the probability that the Professor Bailey’s personality index of a randomly selected person will exceed 0.44?
*Saturday, October 12, 2013 at 12:30pm by Jacky*

**Stat**

6% of american drivers read the newspaper while driving if 300 drivers are selected at random find the probability that between 15 and 25 say they read while driving
*Monday, April 30, 2012 at 7:27pm by Anonymous*

**stat**

The average commute time via train from the Chicago O'Hare Airport to downtown is 60 minutes with a standard deviation of 15 minutes. Assume that the commute times are normally distributed. What proportion of commutes would be: longer than 80 minutes? less than 50 minutes? ...
*Friday, October 14, 2011 at 11:21pm by des*