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February 22, 2017

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
Please help, I do not understand how to do this: Let x be a random variable that represents white blood cell count per cubic milliliter of whole blood. Assume that x has a distribution that is approximately normal, with mean μ = 7400 and estimated standard deviation σ = 2900...
Thursday, November 17, 2016 by Amy

Statistics
Suppose the heights of 18-year-old men are approximately normally distributed, with mean 66 inches and standard deviation 4 inches. (a) What is the probability that an 18-year-old man selected at random is between 65 and 67 inches tall? (Round your answer to four decimal ...
Thursday, November 17, 2016 by Amy

Statistics
In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. Ocean fishing for billfish is very popular in the Cozumel region of Mexico. In the Cozumel region ...
Thursday, November 17, 2016 by Amy

English 10
A Contribution to Statistics" 1.Which of the following words best describes the author's view of humanity in "A Contribution to Statistics"? A. Altruistic B. Optimistic*** C. Pessimistic D. Realistic Read the following lines from the poem "A Contribution to Statistics." Glad ...
Thursday, November 17, 2016 by Ashley

Statistics
Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of 32 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of watch lifetimes is 7 ...
Wednesday, November 16, 2016 by Amy

Statistics
find z such that 6.6% of the standard normal curve lies to the right of z. (Round your answer to two decimal places.)
Wednesday, November 16, 2016 by Amy

Statistics
A youth group has 7 boys and 5 girls. Experiment is select 5 people at random from the group. Let X be the number of boys in the selected 5 people. (a) Find the probability of exactly 1 boy, i.e., P([X = 1]). (b) Find the probability of exactly 2 boy, i.e., P([X = 2]). (c) ...
Wednesday, November 16, 2016 by Hayley

Statistics
Before a DVD player leaves the factory, it is given a quality-control check. The probability that a DVD player contains 0, 1, or 2 defectives are 0.90, 0.08, and 0.02, respectively. In a sample of 10 players, (a) Find the probability that 6 have 0 defects, 3 have 1 defect, ...
Wednesday, November 16, 2016 by Hayley

Statistics
Suppose that the probability that an item produced by a certain machine will be defective is 0.2. A sample of 12 items is chosen. Let X be the number of defectives among the selected 12 items. (a) Find the probability of at most 1 defective item. (b) Find the probability of at...
Wednesday, November 16, 2016 by Hayley

English
What does the author achieve by mixing exact and approximate numbers in "A Contribution to Statistics?"
Wednesday, November 16, 2016 by Tyson

Statistics
A random sample of size n is to be drawn from a population with a mean = 1100 and SD = 300. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.
Tuesday, November 15, 2016 by Anonymous

Math Statistics
N= 80 p = 0.7 x = 62? A) Exact: 0.0335; Approximate: 0.0334 B) Exact: 0.0343; Approximate 0.0334 C) Exact: 0.0343; Approximate: 0.0350 D) Exact: 0.0343; Approximate: 0.0342 Which one is the correct answer and can you show work please?
Tuesday, November 15, 2016 by Anonymous

Math Statistics
A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.
Tuesday, November 15, 2016 by Anonymous

Statistics
A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.
Tuesday, November 15, 2016 by Karen

English
Which of the following is not an object of satire in "a contribution to the statistics'? A. The self importance of social studies B. The corruption of the powerful C. Thee pride of mankind D. The delusions of common people << Which of the following sentences contains a ...
Tuesday, November 15, 2016 by Sami

English
Read the following lines from the poem "a contribution to statistics" "glad to lend a hand if it doesn't take too long -as high as forty-nine, always good because they can't be otherwise -four, well maybe five, the speaker shares high and low statistical data most likely to? A...
Monday, November 14, 2016 by carma

Statistics
A basketball team has to play 3 games in an elimination roumd. What is the probability of them winning? A. 0 games B. 1 game C. 2 games D. 3 games
Monday, November 14, 2016 by V

Statistics
John drives to work each morning and the trip takes an average of µ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of s = 5 minutes. For a randomly selected morning, what is the probability that John’s drive to work will ...
Sunday, November 13, 2016 by Anonymous

statistics
A music industry researcher wants to estimate, with a 90% confidence level, the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year. Previous studies show that 21% of those people (21 to 35 year olds) interviewed go to at least 3 ...
Sunday, November 13, 2016 by liz

statistics
The mean rent of a 3-bedroom apartment in Orlando is $1200. You randomly select 12 apartments around town. The rents are normally distributed with a standard deviation of $75. What is the probability that the mean rent is more than $1000?
Sunday, November 13, 2016 by e

statistics
As a manager for an advertising company, you must plan a campaign designed to increase Twitter usage. A recent survey suggests that 85% of adults know what Twitter is. How many adults should you survey in order to be 90% confident that your estimate is within 5% of the true ...
Sunday, November 13, 2016 by e

statistics
Assume that men have IQ scores that are normally distributed with a mean of 99 and a standard deviation of 13. Find the IQ score that separated the lower 30% of the others. Round up to the nearest integer.
Sunday, November 13, 2016 by e

Statistics
A bag contains 8 red marbles 4 blue marbles and 1 green marbles. Find p(not blue)
Sunday, November 13, 2016 by Tasha

Statistics
According to the record of the registrar's office at a state university, 35% of the students are freshman, 25% are sophomore,16% are junior and the rest are senior. Among the freshman, sophomores, juniors and seniors, the portion of the students who live in the dormitory are ...
Sunday, November 13, 2016 by Myda

statistics
there are 7 blue socks,5 red socks,3 green socks and 4 yellow socks in a drawer. 1.find the sample space 2.how many socks should I take out without looking to get a pair of socks 3.what is the probability that the first socks that I draw is red 4.what is the probability that ...
Saturday, November 12, 2016 by varghese

statistics
A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer’s food. If p ^ is the sample proportion saying that the...
Friday, November 11, 2016 by mina

Statistics
A card is drawn from a deck of 52 and recorded. Then the card is replaced and the deck is shiffeled. this process is repeated five times. What is the probability that all five times the car drawn is an ace
Thursday, November 10, 2016 by Gabu

statistics
the arithematic mean of two numbers is 15 and geometric meanis 12.Find the two numbers and find harmonic mean of these numbers.
Thursday, November 10, 2016 by Ana

statistics
A crane is designed in such a way that it can lift a maximum load of 2750kg.Is the crane overload if the container is filled with 50 bags of cement 40kg each and 5 machine of average 100kg?
Thursday, November 10, 2016 by Ana

statistics
a person drove on a highway first 5km at a speed of 60km/h ,the second 5km at a speed of 85km/h , third 5km at a speed of 92km/h and last 5km of his journey,the speed was 8okm/h.Use suitable average to find average speed of the journey of 20km.
Thursday, November 10, 2016 by Ana

STATISTICS
If is equal to 0.79, then is equal to ______.
Tuesday, November 8, 2016 by JENNIFER

business statistics
1. The average life expectancy of people around the world is 71.30 years with a population standard deviation of 8.00 years. I take a sample of 50 countries now and find that the average life expectancy is 74.37 years. Suppose I’m interested in seeing if there has been a ...
Monday, November 7, 2016 by amanda

Statistics
Need help with this statistics assignment. Of course not asking for you to do it, just an example or help on how to answer. Find some information in a book, research article, newspaper, magazine, or online about any kind of medical research that includes a measure of center or...
Monday, November 7, 2016 by Amanda

statistics
A factory's worker productivity is normally distributed. One worker produces an average of 72 units per day with a standard deviation of 23. Another worker produces at an average rate of 68 units per day with a standard deviation of 23. A. What is the probability that in a ...
Monday, November 7, 2016 by Tima

statistics
an archer shoots arrows at the bull's eye of a target and measures the distance from the center of the target to the arrow. identify the random variable of interest, determine whether it is discrete or continuous, and list its possible values
Sunday, November 6, 2016 by Anonymous

Statistics
Suppose that 30% of all college students smoke cigarettes. A sample of 18 is selected randomly. What is the probability that exactly 10 students smoke? Round your answer to four decimal places.
Sunday, November 6, 2016 by Anonymous

statistics
Find sd. The differences between two sets of dependent data are -8, 4, -6, 10. Round to the nearest tenth. A.) 4.3 B.) 195.5 C.) 6.8 D.) 8.5
Saturday, November 5, 2016 by janet

Statistics
"Suppose two independent samples have been collected.Based on a sample of 26 from the first population, you observe 14 successes. The second sample of size 26 had 17 successes. What is the critical value for a 85% confidence interval that compares these two population ...
Saturday, November 5, 2016 by Chris

Statistics
A friend gives you the following Fs and decision made. Does the decision appear to be correct? Explain.Do NOT provide critical or table values as explanations. F(2, 63) = .10, not significant F(3, 85) = -1.70, not significant F(1, 120) = 64.32, not significant F(5, 70) = 1.00...
Thursday, November 3, 2016 by Lizzy

statistics
Despite he outrageous incomes of some, the mean income of all aging rock stars is relatively modest: $75,000 with a standard deviation of $2,000. On that scale, Chubby Checker, appears to do better than average: at most, only 6.25% of aging rockers make more than he does. what...
Wednesday, November 2, 2016 by Anonymous

Statistics
Suppose Cindy is taking a multiple-choice test where there are 5 possible answers on each question. If she guesses on all 8 questions, what is the probability that she gets: a.) exactly 3 correct. b.) at least 1 correct. c.) What is the mean? d.) What is the standard deviation?
Wednesday, November 2, 2016 by Luna

statistics
a social worker is involved in a study about family structure. She obtains information regarding the number of children per family for a certain community from the census data. Identify the random variable of interest, determine whether it is discrete or continuous, and list ...
Tuesday, November 1, 2016 by Anonymous

AP Statistics
The ages of the Oscar-winners for best actor and actress for the years 1970 through 1990 are given below: Women: 34,34,26,37,42,41,35,31,41,33,30,74,33,4​9,38,61,21,41,26,80,72 Men: 43,40,48,48,56,38,60,32,40,42,37,76,39,5​5,45,35,61,33,51,32,42 Use what you have ...
Tuesday, November 1, 2016 by Nana

statistics
Suppose that the mpg rating of Passengers Cars is a normally distributed random variable with a mean and a standard deviation of 33,8 mpg and 3,5 mpg. Question : an automobiles manufacturer wants to build a new Passenger car with an mpg rating that improves upon 99% of ...
Tuesday, November 1, 2016 by ggerrlo

Statistics
Your pocket contains 2 quarters and 2 Nickels. You randomly pick one of the coins and without replacing it you pick a second coin. Are the events, Q1 = First pick was a quarter Q2 = Second pick was a quarter a) Independent? b) What is the probability of getting a quarter both ...
Tuesday, November 1, 2016 by Anonymous

Statistics
Three final candidates (Alex, Bo, and Chris) for a position happen to take different versions of the aptitude test. You are supposed to choose the one who performed best out of these three final candidates and the test results are as follows: Alex received 88 from the test ...
Sunday, October 30, 2016 by Lacy

Statistics
Please help me with this homework you roll two fair dice, a green one and a red one? (a) are the outcomes on the dice independent? (b)Find P(1 on green die and 2 on red die) (c)Find P(2 on green die and 1 on red die) (d)Find P(1 on green die and 2 on red die) or (2 on green ...
Sunday, October 30, 2016 by Mary

Statistics
you roll two fair dice, a green one and a red one? (a) are the outcomes on the dice independent? (b)Find P(1 on green die and 2 on red die) (c)Find P(2 on green die and 1 on red die) (d)Find P(1 on green die and 2 on red die) or (2 on green die and 1 on red die) a)yes b)p(1)*(...
Sunday, October 30, 2016 by John

Statistics
The Citiburg Parks Department has just installed 1100 new lightbulbs with an expected mean lifespan of 64 months and a lifespan standard deviation of 8 months. Assuming normally distributed bulb failure, how many bulbs will need to be replaced after 49 months? Round your ...
Saturday, October 29, 2016 by Jen

Statistics
The Townville Parks Department has just installed 1900 new lightbulbs with an expected mean lifespan of 75 months and a lifespan standard deviation of 12 months. Assuming normally distributed bulb failure, how many bulbs will need to be replaced after 53 months? Round your ...
Saturday, October 29, 2016 by Jen

statistics
Suppose the average weight for population of men is 178 pounds. You draw a random sample of 10 men and record the following weights: 150, 145, 180, 200, 175, 190, 142, 175, 240, 150. Calculate the sampling error.
Thursday, October 27, 2016 by Bob

STATISTICS
A3. A Retailing Entrepreneur sells sophisticated running shoes whose weights are assumed to be normally distributed with a mean of 12 grammes and a standard deviation of 0.5 grammes. (a) What is the probability that a shoe weighs more than 13 grammes? [3] (b) What must the ...
Thursday, October 27, 2016 by ISRAEL

STATISTICS
A2. Reviewed statistics indicated that there is an average of five thefts per day from a large supermarket operating from 08 00 to 19 00 six days a week. Find the probability that there (a) are no thefts in a week. [2] (b) will be ten thefts in any given day. [4] (c) are four ...
Thursday, October 27, 2016 by MOSES

STATISTICS
Miss Dombo, a Ticketing Manager with an Airline flying international routes, has realised that not all passengers show up for their reserved seat. It is clear to her that each passenger’s behaviour is independent of the other. Having fixed the chances of a passenger not ...
Thursday, October 27, 2016 by JANE

statistics
In studying the responses to a multiple-choice test question,the following sample data were obtained. At the .05 significance level, test the claim that the responses occur with the same frequency. show work for test statistic & p. response a b c d e/ 12 15 16 18 19 my answer ...
Wednesday, October 26, 2016 by Dhelp

Statistics
The Villopolis Parks Department has just installed 1900 new lightbulbs with an expected mean lifespan of 66 months and a lifespan standard deviation of 6 months. Assuming normally distributed bulb failure, how many bulbs will need to be replaced after 56 months?
Wednesday, October 26, 2016 by Jourdan

Statistics
You are interested in estimating the mean of a population. you plan to take a random sample from the population and use the samples mean as an estimate of population mean. Assuming that the population from which you select your sample is normal, which of the statements about ...
Tuesday, October 25, 2016 by Winston

Statistics
The following simple random sample was selected from a normal distribution: 4, 6, 3, 5, 9, and 3. a. Construct a 90% confidence interval for the population mean μ.
Tuesday, October 25, 2016 by tae

Statistics
The playing time X of classical CDs has the normal distribution with mean 54 and standard deviation 5; the N(54, 5) distribution. What is the relative frequency of classical CDs with playing time X between 49 and 69 minutes?
Tuesday, October 25, 2016 by Jasel

Statistics
A VP of manufacturing claims that more than 3% of items produced using a certain assembly line are defective. A random sample of 400 items is selected. At the 10% level of significance, which of the following would be part of the standardized decision rule? - Conclude H0 if TS...
Tuesday, October 25, 2016 by AL

Statistics
In a distribution where the mean is to the right of the median, the histogram of the distribution will probably: a. have a longer tail on the right side b. show a uniform distribution c. be symmetric d. be bi-modal
Tuesday, October 25, 2016 by Lea

Statistics
Scores on the 1995 SAT verbal aptitude test among Kentucky high school seniors were normally distributed with an average of 420 and the SD of 80. Scores on the 1995 SAT quantitative aptitude test among Kentucky high school seniors were normally distributed with an average of ...
Tuesday, October 25, 2016 by Madison

Statistics Probability
A jar contains 5 red marbles, numbered 1 to 5, and 11 blue marbles numbered 1 to 11. a) A marble is chosen at random. If you're told the marble is red, what is the probability that it has the number 2 on it? b)The first marble is replaced, and another marble is chosen at ...
Monday, October 24, 2016 by Jesus

STATISTICS
Suppose that a researcher is interested in estimating the mean systolic blood pressure, , of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate . Assuming that the standard deviation of the ...
Monday, October 24, 2016 by RILEY

STATISTICS
A study of college football games shows that the number of holding penalties assessed has a mean of penalties per game and a standard deviation of penalties per game. What is the probability that, for a sample of college games to be played next week, the mean number of holding...
Monday, October 24, 2016 by RILEY

statistics
The current rate of success is 70% for 200 students. When the new test is implemented, the rate increases to 85% for the 50 students who pass the test and are allowed into the program. Is this difference significant?
Sunday, October 23, 2016 by pamela

Statistics
Assume a study of 500 randomly selected school bus routes revealed 480 arrived on time. Is it significant for a school bus to arrive late?
Sunday, October 23, 2016 by Tracy

Statistics
A dice rolling just once What is probability of given the face is odd, it is a 1?
Sunday, October 23, 2016 by Rashad Suleymanli

Statistics
Write an inequality that represents all of the data values X, that fall between the values of the mean +/- the standard deviation
Friday, October 21, 2016 by Mary

Health!
Statistics of Suicide regarding Antisocial Personality Disorder
Friday, October 21, 2016 by J

science
identify the best way to display statistics in a research report
Friday, October 21, 2016 by luma

math
How many paths spell STATISTICS using Pascal's triangle? S T T A A A T T T T I I I S S T I I C C C S S Thanks in advance
Wednesday, October 19, 2016 by Jenna

statistics
A naturalist leads whale watch trips every morning in March. The number of whales seen has a Poisson distribution with a mean of 2.1 Find the probability that on a randomly selected​ trip, the number of whales seen is 3. Round to four decimal places.
Tuesday, October 18, 2016 by anonymous

statistics
An unfair coin has a probability of coming up heads of 0.55 the coin is tossed 4 times. What is the probability that it lands heads at least once?
Monday, October 17, 2016 by gio

Statistics
A tobacco company claims that the nicotine content of its "light" cigarettes has a mean of milligrams and a standard deviation of milligrams. What is the probability that randomly selected light cigarettes from this company will have a total combined nicotine content of ...
Sunday, October 16, 2016 by mike

Statistics
If there are 6 red disks numbered 1 through 6, and 4 yellow disks numbered 7 through 10, find the probability of selecting a yellow disk given that the number selected is less than or equal to 4 or greater than or equal to 8.
Sunday, October 16, 2016 by SHEYLAMIEL

Statistics
A study of 29 female Sumatran elephants provided a 95% confidence interval for the mean shoulder height as (197.2, 235.1) cm. Consider a new study to estimate the mean shoulder height of male Sumatran elephants. Assuming the standard deviations of shoulder heights are similar ...
Saturday, October 15, 2016 by Tabetha

Statistics
A science teacher gives a test with 15 questions. This teacher is a hard grader. The teacher assigns points in the following manner: a correct answer = +1 point, an incorrect answer = -1 point, no answer = 0 points. So scores on the test could range from +15 to -15. The ...
Friday, October 14, 2016 by sam

Statistics
Suppose that 40 students take a quiz and everyone in the class scores an 80. The standard deviation of scores for this quiz is: 80 2 0
Friday, October 14, 2016 by sam

Statistics
A college statistics class conducted a survey of how students spend their money. They asked 25 students to estimate how much money they typically spend each week on fast food. They determined that the mean amount spent on fast food is $31.52 with a standard deviation of $21.60...
Friday, October 14, 2016 by sam

Statistics
suppose that 80% of all 18 year olds play basketball. if a sample size of 4 is taken, find the probability that the sample proportion lies within and including one standard deviation of the population proportion
Friday, October 14, 2016 by Jay

Statistics
The probability a company will hire a new employee is 0.38. Suppose three companies are randomly selected. (a) Find the probability all three companies will hire a new employee. (b) Find the probability at least one company will hire a new employee. (c) Find the probability ...
Wednesday, October 12, 2016 by Steve

statistics
consider shuffling a standard 52 deck of cards and drawing one which is black. what is the probability that the card is a 4,5,or 6
Tuesday, October 11, 2016 by NJABU

statistics
According to a survey, 21% of motorists in a large city are uninsured. Suppose that currently 21% of all motorists in this city are uninsured. Two motorists are selected at random from this city. Let x denote the number of motorists in this sample of two who are uninsured. ...
Monday, October 10, 2016 by Anonymous

Statistics
P=8.12E-4<=.01 Why is 8.12 less than .01
Monday, October 10, 2016 by Help

Statistics/Probability
An observer has measured the starting position of a toy vehicle as xs = 9.3 ± 0.2 m and the finishing position as xf = 14.4 ± 0.3 m. Calculate the displacement and the error in the displacement. I am not sure where to start at all.
Monday, October 10, 2016 by Erica

Statistics
Four cards are chosen at random. What is the probability that at least 2 are J's? How is this problem computed? Using Combinations or permutations?
Sunday, October 9, 2016 by Pete

Statistics
If $3000 is invested at 3% compounded monthly how much in 9 years
Sunday, October 9, 2016 by Anonymous

Statistics
If $3000 is invested at 3% compounded monthly how much in 9 years
Sunday, October 9, 2016 by Anonymous

Statistics
Scores on an SAT test have a mean of μ = 1026 and a standard deviation of σ = 209. Compute the margin of error of the sample mean for a random sample of 100 students.
Sunday, October 9, 2016 by Allie

Statistics
The weight of luggage that a randomly selected airline passenger brings onto a flight has a mean of 35 lbs and a standard deviation of 6 lbs. If a flight has 80 passengers, within what range would the average weight of their luggage fall with 95% certainty?
Sunday, October 9, 2016 by Allie

Statistics
Suppose systolic blood pressure (the higher of the two blood pressure readings) of a large group of individuals is normally distributed. If the mean is 122 and the standard deviation is 20, then
Sunday, October 9, 2016 by JOHN

Statistics
a ball rolls off a table and falls 0.80 m to the floor, landing with a speed of 4.5 m/s. 1. What was the initial speed of the ball? 2. What initial speed must the ball have if it is to land with a speed of 5.8 m/s? 3. What is the magnitude of the acceleration of the ball just ...
Sunday, October 9, 2016 by Charlie

Math
This is your question number 2 for today, out of 5 allowed. Here's your question for category 'Probability-and-statistics'. 16 teams decided to participate in a football competition. In the preliminary round, the 16 teams will br divided into 4 groups and they have to compete ...
Sunday, October 9, 2016 by Aina

Statistics and
In a survey of 144 pet owners, 31 said they own a dog, and 91 said they own a cat. 14 said they own both a dog and a cat. How many owned neither a cat nor a dog?
Saturday, October 8, 2016 by Josh

STATISTICS
A certain disease has an incidence rate of 0.6%. If the false negative rate is 4% and the false positive rate is 4%, compute the probability that a person who tests positive actually has the disease
Friday, October 7, 2016 by Anonymous

Statistics
Can anyone help me with this? Which of the following statements is true about a 99% confidence interval? a. The interval contains 99% of the population. b. The probability that the population mean is in the interval is 99%. c. The interval is wider than a 95% confidence ...
Friday, October 7, 2016 by Angel

statistics
A STAT 200 instructor is interested in whether there is any variation in the final exam grades between her two classes Data collected from the two classes are as follows: Her null hypothesis and alternative hypothesis are: (a) Determine the test statistic. Show all work; ...
Friday, October 7, 2016 by chris

Statistics
A doctor want to estimate the HDL cholesterol of all 20- to 29- year old females. how many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confindence assuming s=10.5. Suppose the doctor would be content with 90% confidence. How does the decrease ...
Friday, October 7, 2016 by Makaila

Statistics
Find the minimum sample size n needed to estimate u for the given values of c, s, & E. c=0.98, s=6.5, & E=1.?
Friday, October 7, 2016 by Makaila

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Homework Help: Math