September 24, 2014

Search: Math-Stats

Number of results: 93,409

is there a good, relevant sites where i can get stats extra help?
October 11, 2007 by Keirson

C++ Programming
Design and create a class named Stats that has an array of 12 doubles as one of its member variables. The values in the array should be set by making 12 calls to a public member function named setValue that accepts two arguments, an integer indicating which value is being ...
June 8, 2010 by kyuu09

math stats
how do i draw a histogram for the data (8,0,7,5,5)
January 24, 2012 by juan777

math stats
Calculate p ̅. x1 20 n1 50 x2 55 n2 100
June 22, 2013 by jerry

math stats
A true-false test consists of 50 questions. how many does a student have to get right to convince you that he is not merely guessing Explain
October 17, 2011 by julia42

bus. stats
Given that math SAT scores are normally distributed (follow the empirical rule) m=500 Standard deviation=100 what is the math SAT score for someone who is in the 80th percentile of his or her class.
March 3, 2010 by mike

bus. stats
Given that math SAT scores are normally distributed (follow the empirical rule) m=500 Standard deviation=100 what is the math SAT score for someone who is in the 80th percentile of his or her class.
March 3, 2010 by mike

Use this z-score formula for this problem: z = (x - mean)/(sd/√n) x = 1.25, 1.50 mean = 1.35 sd = 0.25 n = 40 Calculate two z-scores, then use a z-table to determine probability between the two scores. I hope this will help get you started. •stats. - Christina, Monday, ...
March 18, 2013 by Christina Ms Sue please help

does anyone know anyting about standard deviation... I have no idea what it is!
August 5, 2007 by Kaz

If you square a correlation coefficient and subtract this number from 1.00, what is the result? Is it the coefficient of determination?
February 6, 2010 by Patty

sample of n=5 scores (8,0,7,5,5) make an estimate of the standard deviation by finding average distance of the smallest and largest distance from the mean
January 24, 2012 by juan777

Math Stats
A random sample of 30 plants has a sample standard deviation of 3.4 days for maturity. A 95% confidence interval for the population variance is __ to __days.
March 28, 2012 by Apryl

What is the standard deviation of a $1 bet on any one particular number, e.g., 33, in the game of American roulette? Notice the payoff is 35:1 for this type of bet.
September 2, 2014 by Justin

stats math
Suppose x is normally distributed with a mean of 130 and a standard deviation of 25. Twenty-six percent of the values are less than what value? 123.5 114 136 146
July 18, 2010 by thara

If SS = 50 and s^2 = 10, what is n?
October 2, 2012 by eric

A certian company enjoyed 3.5% profits in year 1 over its revenue in Year 0. In Year 2, it enjoyed 5.75% profits over Year 1. In Year 3, it posted 1.25% profits over Year 2. What single, constant profit over this period of years would have produced the same profit? The teacher...
May 4, 2011 by Anonymous

College Stats
Is .09 less than .05?
May 8, 2011 by Carol

given n=74 an x=32.find ^p and ^q
April 4, 2013 by Chris

Math- STATS 218
When the following hypotheses are being tested at a level of significance of aH0: m 100 Ha: m < 100 the null hypothesis will be rejected if the test statistic Z is a. >Z b. >Z c. <Z d. <100
July 27, 2012 by Brittany

stats math
Suppose Ray makes 85% of his free throws. What is the probability that Jordan will make 2 free throws in a row?
November 26, 2012 by denise

Math, Stats
the probability is 0.6 that a person shopping at a certian store will spend less than $20. For group of size 19, find the mean number who spend less then $20.
February 21, 2011 by Olivia

Math, Stats
the probability is 0.6 that a person shopping at a certian store will spend less than $20. For group of size 19, find the mean number who spend less then $20.
February 21, 2011 by Olivia

stats math
Suppose that two cards are randomly selected from a standard 52-card deck. What is the probability that the first card is a spade and the second card is a space if the sampling is done without replacement?
November 26, 2012 by denise

You have many old textbooks in your apartment. You have 6 math books, 7 econ, and 4 accounting. Assume that each textbook is different than the other. A) What is the probability that the last book is one of the economic textbooks? B) What is the probability that none of the ...
September 9, 2014 by Rebekah

Math (Stats)
Explain some of the obstacles to trying to build a sampling distribution through repeated samples, even with software. The only obstacle I can think of is that it is time consuming and it could be expensive...are there other obstacles?
October 28, 2008 by Sara

if we reject the null hypothesis, we conclude that:
April 1, 2010 by Anonymous

Compute the following and show your steps 7! /5!.
August 7, 2010 by renae

what does it mean to say alpha is set at 0.5
August 18, 2011 by nicole

What is the spread? How can it be found from a set of numbers?
March 6, 2012 by Jill

Suppose the correlation between SAT Verbal scores and Math scores is 0.57 and that these scores are normally distributed. If a student's Verbal score places her at the 90th percentile, at what percentile would you predict her Math score to be?
January 24, 2008 by Danielle

how does one make a residual plot please?
November 16, 2007 by Anonymous

What are variance and covariance? What do they mean? What are their differences/relationship?
September 22, 2008 by Blake

what are some tricks that will; help me remember the stats and the capitles
February 23, 2010 by briana

Let z be a random variable with a standard normal distribution, P(-1.9<=z<=2.1)
July 24, 2010 by Clay

Mean is 60 and standard deviation is 7. what percentage is 73 and below.
October 12, 2010 by Christine

If a confidence interval for the mean is 24.8 < ě < 29.6. What is the margin of error?
November 1, 2010 by Erica

maths stats
Please unscramlbe aaeebllnn which is a name. Thanks
May 5, 2011 by orla

what is the range of data with a total of 1000 values?
September 4, 2011 by Ann james

what is the probability that a loaf of bread is between 22.75 and 23.00?
September 6, 2011 by tim

If Ho: μ = 50 and Ha: mu. = 59 and s = 10 what is αlpha if x exceeds 56for n=25
March 15, 2013 by KP

stats 250
A z-score of z = +3.00 indicates a location that is the following
June 6, 2013 by Anonymous

The playing times of 20 songs on a top-hits radio station are recorded in the chart below. Playing Time (minutes:seconds) 3:32 3:24 2:54 3:07 4:52 3:45 2:39 3:09 3:34 3:26 3:35 4:17 4:03 3:52 5:10 4:59 3:07 4:00 3:07 2:56 In a histogram of this data, which bar would have the ...
July 2, 2009 by Sophie

A Math test has a mean of 51 and standard deviation of 5.0. Find the corresponding z scores for: I. a test score of 64 II. a test score of 47
October 15, 2011 by Jennifer

how do you construct a relative frequency table based on an ogive?
September 6, 2008 by arielle

How would r change if researchers had recordered the proportions?
February 6, 2009 by kate

if you know the mean and standard deviation, how do you determine the proportion that will and will not be included
November 4, 2012 by mary

what is the distinction between repeated measurements and matched items?
November 27, 2012 by jason

A final exam in Math 160 has a mean of 73 with standard deviation 7.73. Assume that a random sample of 24 students is selected and the test score of the sample is computed. Assuming the scores are normally distributed, what percentage of sample means are less than 69?
January 23, 2012 by dan

A statistics teacher believes that the final exam grade for her elementary stats class have a normal distribution with a mean of 82 and a standard deviation on 8. Find the score which separates the top 10% of the scores from the lowest 90% of the scores.
August 11, 2013 by Sean

x and y independent exponential r.v with respctive parameters 2 and 3. find the cdf and density of z = x/y.
November 8, 2006 by ripa

find standard deviation for this problem daily precip- frequency-31,1,0,2,0,1 0.oo-0.49 0.50-0.99 1.00-1.49 1.50-1.99 2.00-2.29 2.50-2.99
May 8, 2008 by ebony

If X is a normal random variable with mean 60, and a standard deviation of 2, find: A: P (X<58) B: P(X>63) C: P(57<X<64)
March 26, 2009 by April

psy Stats.
how do you Calculate percentage when given standard deviation and mean
May 10, 2011 by Kailey

Can you tell me what ∑xy means? Like is in the sum of all x times y or what?
July 10, 2011 by Carol

Find the mean and standard deviation of the following probability distribution: x 1 2 3 P(x) 0.3 0.5 0.2
October 25, 2011 by Jen

if income in the us was normally distributed, what z-score would represent the top 1%?
October 31, 2011 by stacey

using a calculator need p value on a r tailed test if the n=9 and the t is 3.204
December 2, 2011 by James

stats & prob.
Given the values of n=5, p= 0.15, and (1-p)=0.85, calculate the standard deviation of the data.
November 27, 2012 by Georgia

Given a standard normal variable. What is the probability that z lies between 1.48 and 2.13
April 2, 2013 by chris

What does the best estimate mean after doing the liner regression equation
May 6, 2013 by Anonymous

Stats help
What does the best estimate mean after doing the liner regression equation
May 7, 2013 by Anonymous

how to find the are for a standard normal curve that cuts off the upper 1.1%
November 17, 2013 by Anonymous

Need help finding the area under the normal curve between z = -1.0 and z = -2.0?
April 16, 2014 by Betty

what is the probability that a 6 digit phone number contains at least one 8?
July 19, 2014 by michelle

AP Stats
transformation necessary to linearize the data. Be sure to convince me that you understand.
August 10, 2014 by Hep

Where can I find fuel efficient car sales statistic for recent years?
October 25, 2007 by eason

college Stats
If Y has a geometric distribution with success probability p, show that P(Y= an odd integer)= p/(1-(q^2))
October 20, 2009 by james

stats help!
What 2 numbers is the emperical rule of 95% between if the P of no shows is .10 and the average party size is 10
January 13, 2011 by Lauren

What are the steps to solve P(x>k)=.025 when the mean is 500, standard deviation is 100
March 13, 2011 by Lillie

Find the probability that the company will meet its goal on a particular 50 miles of line
October 17, 2011 by Anonymous

What data and stats do you need to know in order to identify profitable nations in which to export.
October 5, 2012 by Lisa

Find the standard normal area for each of the following, showing your reasoning clearly. a. P(1.22<z<2.15) b. P(2.00<z<3.00) c. P(-2.00<z<2.00) d. p(z=0.50)
April 11, 2014 by Kelly

If a measured distribution has an average of 65 and a variance of 16 and the standard deviation of the random error is 4
September 9, 2014 by sas

The heights of women in the US approximately follow a bell shaped curve. What do you think that means?
November 11, 2009 by Sam

A student's grade on an examination was transformed to a z value of 0.67. Therefore, we know that she scored approximately in the top
December 8, 2009 by Anonymous

Six letters are picked. Find the chance that they can be arranged to form the word RANDOM.
April 15, 2014 by Mario007

what are the mean and standard error when using central limit theorem for dichotomous variable
August 28, 2014 by mary

Stats Repost
Your mathematics instructor claims that, over the years, 88% of his students have said that math is their favorite subject. In this year's class, however, only 21 out of 32 students named math as their favorite class. The teacher decides to conduct a test of the hypothesis H0...
December 17, 2012 by Oops

SAT math scores approx. follow a normal distribution, with mean 500 and standard deviation 100. What % of students should have an SAT math score above 500? I think I use mean (500) + z-score * SD (100), but I do not know how to get the z-score?
September 28, 2009 by CM

MATH 15 Stats
simple random sample of 50 women on new product of the 50 women, 60% reported they like the new product, fina a 90% confidence interval for the true proportion of women.
April 13, 2011 by Vicky

Math Stats
Chris is shopping for CDs and decides to purchase 3 movie soundtracks. The store has 9 different movie sountracks in stock. How many different selections of movie sountracks are possible?
September 19, 2012 by Chris

Why is it important to know the possible errors we might make when rejecting or failing to reject the null hypothesis?
May 20, 2008 by Christine

FST (functions, stats, and trigonometry)
what is the equation for the axis of symmetry for the function f(x)=IxI?(absolute value)
October 7, 2009 by Jared

A testing service has 1000 raw scores. It wants to transform the distribution so that the mean =10 and the standard deviation = 1. To do so ?
February 18, 2010 by Z

Algebra 2: Prob and Stats
Find the sample size that produces the margin of error +-4.0% a) 325 b) 25 c) 16 d) 625
May 24, 2010 by Skye

In a distribution of scores with a mean of 234 and a standard deviation of 47, what is in the 43rd percentile ? and what formula do i use ?
February 26, 2011 by Ruben

In a distribution of scores with a mean of 234 and a standard deviation of 47, what is in the 43rd percentile ? and what formula do i use ?
February 26, 2011 by Ruben

women age 20-29 is 36ml staandard deviation 7ml. What is probability greater than 45ml and between 30 and 62 ml
August 27, 2011 by anna

Five measurements are taken and are 59.5", 61.33", 60.55", 61.00", 59.8". Find the likely size of the chance error in a single measurement.
July 17, 2012 by Anonymous

The following confidence interval is obtained for a population proportion, p:0.556 < p < 0.584. What is the point estimate, p?
September 30, 2012 by 1234

1. Find the sample variance and standard deviation 6, 53,11,49,35,26,28,28,31,31 s squared = (round to the nearest hundredth as needed)
October 2, 2012 by pat

if x is a normally distributed random variable with amean of 8.00 if the proability for x is less than 9.54 is 0.67, then find the standard deviation of x
October 21, 2012 by tamara

Suppose X is a uniform random variable with C = 20 and d = 90. Find the probability that a randomly selected observation is between 23 and 85.
November 17, 2012 by Marie

X is normally dsitributed with mean 250 and standard deviation 40. what value of X does only top 15% exceed?
March 24, 2014 by Anonymous

I have like 9 more of these problems, can someone please help me out so I can get started. thanx JS In a random sample of 35 tractors, the annual cost of maintenance was $4,425 and the standard deviation was $775. Construct a 90% confidence interval for this. Assume the annual...
May 1, 2013 by Jessica

Ok please help me. Here is my stats question Suppose there is a 20% chance of striking oil at a certain location. An oil company drills at 5 different spots. What is the probablity of them striking oil on at least one of the spots? Any help is greatly appreciated
February 3, 2010 by Ted

I've finished studying a full textbook on linear algebra and another on statistics. I've done most of the practice problems and I understand everything covered in these books very well. But I need to know more. Specifically, I'd like to understand more about: - Gauss Markov ...
April 25, 2008 by mathstudent

Assume that aset of test scores is normally distributed with a mean of 100 and a standard deviation of 20 use the 68-95-99?
July 4, 2010 by Anonymous

what is it called when all the items in the population have the same chance of being selected for the sample?
October 8, 2011 by Tim

a die is rolled three times. find the chance that not all the rolls show 3 or more spots
December 4, 2011 by Fay

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