# Math & Stats

137,434 results

### stats

is there a good, relevant sites where i can get stats extra help?

### 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 ...

### Stats

So i have a test in stats tomorrow and im trying to work on my study guide but im stuck at this question : Construct a confidence interval for the proportion for each case 90 percent interval 861 out of 2500. please help.

### math stats

how do i draw a histogram for the data (8,0,7,5,5)

### math stats

Calculate p ̅. x1 20 n1 50 x2 55 n2 100

### Introduction programing visual basic

break even analysis. suppose a certain product sells for a dollars per unit. then the revenue from selling x units of the product is ax dollars if the cost of producting each unit of the product is b dollars and the company has overhead cost of c dollars then the total cost of...

### Introduction programing visual basic

break even analysis. suppose a certain product sells for a dollars per unit. then the revenue from selling x units of the product is ax dollars if the cost of producting each unit of the product is b dollars and the company has overhead cost of c dollars then the total cost of...

### Prob & Stats

A medical researcher gave 100 patients a new drug to see if it reduces their blood pressure? Did the new drug reduce the patients' blood pressure? Write your hypothesis mathematically. Not sure how to do this, Prob & Stats has been quite a struggle for me

### stats

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...

### 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

### Math/Statistics

does anyone know anyting about standard deviation... I have no idea what it is! http://en.wikipedia.org/wiki/Standard_deviation http://www.robertniles.com/stats/stdev.shtml

### 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.

### 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.

### Math: Chi Squared

I typed my observed values into the matrix and went to stats, tests, c:,.. Enter.. But the TI-83 says Error:domain How can I fix this?

### Stats

About 10% of the population of a large country is math phobic. If two people are randomly selected what is the probability both are math phobic? And hat is the probability that at least one is math phobic? Any way to do this on stat crunch?

### math/stats

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

### Math/Stats

The average monthly attendance to the senior citizen bowling league is 67 with a stdev of 6.5. What is the probability that a randomly selected day will see between 72 and 78 visitors?

### math (stats)

Find the z scores that separate the middle 59% of the distribution from the area in the tails of the standard normal distribution.

### stats

If SS = 50 and s^2 = 10, what is n?

### math(stats)

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

### 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.

### math/stats

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.

### 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

### Stats

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...

### College Stats

Is .09 less than .05?

### stats

given n=74 an x=32.find ^p and ^q

### 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

### stats math

Suppose Ray makes 85% of his free throws. What is the probability that Jordan will make 2 free throws in a row?

### stats

if we reject the null hypothesis, we conclude that:

### stats

Compute the following and show your steps 7! /5!.

### stats

what does it mean to say alpha is set at 0.5

### Stats

What is the spread? How can it be found from a set of numbers?

### Stats

Which of the following numbers could be a proabilty of an event 0, 1.15, 0.03, -0.43, 1, 0.34

### Stats

How do you find SSA, SSB & SSE??

### stats

A sample has a mean of M = 73 and a standard deviation of s = 5

### 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.

### 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.

### 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?

### math-stats

There are 40 items in which 8 are defective. if 6 items are selected at random, what is the probability that 4 are non defective?

### 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?

### stats

how does one make a residual plot please?

### Stats

What are variance and covariance? What do they mean? What are their differences/relationship?

### geography

what are some tricks that will; help me remember the stats and the capitles

### stats

Let z be a random variable with a standard normal distribution, P(-1.9<=z<=2.1)

### stats

Mean is 60 and standard deviation is 7. what percentage is 73 and below.

### Stats

If a confidence interval for the mean is 24.8 < ì < 29.6. What is the margin of error?

### maths stats

Please unscramlbe aaeebllnn which is a name. Thanks

### Stats

what is the range of data with a total of 1000 values?

### bussi./stats

what is the probability that a loaf of bread is between 22.75 and 23.00?

### STATS

If Ho: μ = 50 and Ha: mu. = 59 and s = 10 what is αlpha if x exceeds 56for n=25

### stats 250

A z-score of z = +3.00 indicates a location that is the following

### stats

what is the lower and upper limit for -645.321?

### Stats

Explain what it means to have a deviation score of -18

### Stats

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 ...

### stats

how do you construct a relative frequency table based on an ogive?

### stats

How would r change if researchers had recordered the proportions?

### stats

if you know the mean and standard deviation, how do you determine the proportion that will and will not be included

### stats

what is the distinction between repeated measurements and matched items?

### STATS

What percentage of the area of the standard normal distribution is between z = -1.00 and z = +1.00? How do you know this?

### health/stats

can cholesterol follow a normal distribution exactly? why or why not?

### Stats

let x be a binomial random variable with expected valuee 4 and variance 2 a) What is P(X=3)? b) What is P(X<6)?

### stats

x and y independent exponential r.v with respctive parameters 2 and 3. find the cdf and density of z = x/y.

### stats

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

### Stats

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)

### psy Stats.

how do you Calculate percentage when given standard deviation and mean

### Stats

Can you tell me what ∑xy means? Like is in the sum of all x times y or what?

### Stats

Find the mean and standard deviation of the following probability distribution: x 1 2 3 P(x) 0.3 0.5 0.2

### stats

if income in the us was normally distributed, what z-score would represent the top 1%?

### stats

using a calculator need p value on a r tailed test if the n=9 and the t is 3.204

### stats & prob.

Given the values of n=5, p= 0.15, and (1-p)=0.85, calculate the standard deviation of the data.

### stats

Given a standard normal variable. What is the probability that z lies between 1.48 and 2.13

### stats

What does the best estimate mean after doing the liner regression equation

### Stats help

What does the best estimate mean after doing the liner regression equation

### stats

how to find the are for a standard normal curve that cuts off the upper 1.1%

### Stats

Need help finding the area under the normal curve between z = -1.0 and z = -2.0?

### stats

what is the probability that a 6 digit phone number contains at least one 8?

### AP Stats

transformation necessary to linearize the data. Be sure to convince me that you understand.

### Stats

What is the best measure to describe the total variability in a population or sample?

### statistics

what does this mean i have to do this in a spreadsheet Descriptive stats for each numeric variable

### Math-stats

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 ...

### Stats

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?

### Stats

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

### Stats -Math

1. We are interested in conducting a study in order to determine what percentage of voters of a state would vote for the incumbent governor. What is the minimum size sample needed to estimate the population proportion with a margin of error of 0.05 or less at 95% confidence? ...

### stats

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?

### Stats

Where can I find fuel efficient car sales statistic for recent years?

### college Stats

If Y has a geometric distribution with success probability p, show that P(Y= an odd integer)= p/(1-(q^2))

### 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

### stats

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

### stats

Find the probability that the company will meet its goal on a particular 50 miles of line

### business

What data and stats do you need to know in order to identify profitable nations in which to export.

### Stats.

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)

### stats

If a measured distribution has an average of 65 and a variance of 16 and the standard deviation of the random error is 4

### stats

(a) Suppose n = 26 and p = 0.30. Can we approximate p̂ by a normal distribution? Why? (Use 2 decimal places.)

### stats

7. Give and interpret the 95% confidence interval for the hours of sleep a student gets.

### Stats

The probability that the twelve graduates will have a mean salary over $50,000 is...

### Stats

What types of bias could be in a survey asking students how many classes they take per semester? Thanks -MC

### Math/Statistics

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.

### math/stats

A hamburger chain found that 65% of all customers use mustard, when they buy hamburgers. If 5 customers randomly selected, what is the probability that none use mustard?

### Stats

The heights of women in the US approximately follow a bell shaped curve. What do you think that means?