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March 25, 2017

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Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
You look at the relationship between how much time people spend on the website ‘Bookface’ and how productive they are at work. time spent on Bookface is the predictor variable, and time spent working is the response variable. correlation between minutes spent on Bookface ...
Wednesday, March 22, 2017 by claire

Statistics
A person has money worries and decides to invest in the computer industry. They want to know how the value will change over time. They used an exponetial regression model where the predictor is time in months and the response var is money measure in thousands of dollars. Alpha...
Wednesday, March 22, 2017 by Anonymous

statistics
41% of the student body at Urban High are "cool". Mr. Uppity has devised a test for determining if a student is "cool" or not. What is the average number of students Mr. Uppity needs to test in order to find one who is "cool"? a. 3 b. 3.57 c. 2.43 d. 1.44 e. 2
Wednesday, March 22, 2017 by anna

Statistics
Billy Isastar, a famous basketball player, is not a very good free throw shooter. He manages to connect on 65% of his attempts. What is the probability that the first free throw Johnny hits in a game is on his fourth attempt? a. .015 b. .028 c. .179 d. .096
Wednesday, March 22, 2017 by Ariel

statistics
a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs
Wednesday, March 22, 2017 by samuel

Ruwaydah
This is my hw, however i do not know to put these quotations in my sentences can someone help me? and please do not copy this!I repeat I have recently read Liane Beam Wansbrough’s article on the topic of cosmetic plastic surgery, and I am writing to express my viewpoint and ...
Wednesday, March 22, 2017 by ASAP

Statistics
The amount of time the university professors devote to their jobs per week is normally dis- tributed with a mean of 52 hours and a standard deviation of 8 hours. (a) What is the probability that a professor works for more than 56 hours per week? (b) Find the probability that ...
Monday, March 20, 2017 by Melvin

Statistics
The weight of bags of pretzels are normally distributed with a mean of 150 grams and a standard deviation of 5 grams. Bags in the upper 4.5% are too heavy and must be repackaged. Also, the bags in the lower 5% do not meet the minimum weight requirement and must be repackaged. ...
Monday, March 20, 2017 by Bill

statistics
A school club consists of 22 male students and 15 female students. If 3 students are selected to represent the club in the student government, what is the probability 2 will be male and 1 will be female?
Sunday, March 19, 2017 by kim

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, March 19, 2017 by shane

STATISTICS
Consider a t distribution with 30 degrees of freedom. Compute P(t "greater than or equal to" -1.50). Round your answer to at least three decimal places. Consider a t distribution with 6 degrees of freedom. Find the value of c such that P(-c <t<c)=0.95. Round your answer ...
Saturday, March 18, 2017 by JANAYA

statistics
Find the third quartile Q3 of the list of 24 sorted values shown below. 30 32 33 34 37 37 40 42 43 48 49 50 50 52 57 59 60 61 63 65 67 71 72 7430 32 33 34 37 37 40 42 43 48 49 50 50 52 57 59 60 61 63 65 67 71 72 74
Saturday, March 18, 2017 by Amiee

Statistics
Consider a t distribution with 30 degrees of freedom. Compute P(t "greater than or equal to" -1.50). Round your answer to at least three decimal places. Consider a t distribution with 6 degrees of freedom. Find the value of c such that P(-c <t<c)=0.95. Round your answer ...
Friday, March 17, 2017 by Mariah

Statistics
I am confused by the following and need some help You want to find the values for the equation ŷi=a+bxi. What is the value of the slope? time spent on Bookface predictor variable, time spent working is the response variable. correlation between minutes spent on Bookface and ...
Friday, March 17, 2017 by claire

Statistics
A pilot sample of 50 measurements of the breaking strength of cotton threads gave S_(pr) = 18 grams. Determine the sample size needed to obtain a 90% Confidence Interval of length 4. I tried using the sample size formula but that did not gave me the right answer, according to ...
Wednesday, March 15, 2017 by Zabe

Statistics
Based on data collected by the National Center for Health Statistics and made available to the public in the Sample Adult database (A-5), an estimate of the percentage of adults who have at some point in their life been told they have hypertension is 23.53 percent. If we ...
Wednesday, March 15, 2017 by Vanessa

Statistics
Q1:(a) Make a relative frequency table of the data. Enter your answers to three decimal places. Cell Phone Owned Relative Frequency Android smartphone iPhone smartphone Blackberry smartphone Cell phone not smartphone No cell phone Total (b) Round your answers to the following ...
Monday, March 13, 2017 by Robert

College statistics- SCWK450
One hundred students took a statistics exam where the mean score was 78. The distribution was normal. The standard deviation was 4. If Chris earned an 80 on the exam, at approximately what percentile did his grade fall? (Round your answer to the nearest whole number.)
Sunday, March 12, 2017 by ShaQuana Mitchell

Statistics
One hundred students took a statistics exam where the mean score was 78. The distribution was normal. The standard deviation was 4. If Chris earned an 80 on the exam, at approximately what percentile did his grade fall? (Round your answer to the nearest whole number.) Mean=78 ...
Sunday, March 12, 2017 by ShaQuana Mitchell

Statistics
Childhood participation in sports, cultural groups, and youth groups appears to be related to improved self-esteem for adolescents (McGee, Williams, Howden-Chapman, Martin, & Kawachi, 2006). In a representative study, a sample of n 5 100 adolescents with a history of group ...
Sunday, March 12, 2017 by Shannon

statistics
A bag contains red and blue marbles. Two marbles are drawn without replacement. The probability of selecting a red marble and then a blue marble is 0 .28. The probability of selecting a red marble on the first draw is 0.5. What is the probability of selecting a blue marble on ...
Friday, March 10, 2017 by uos

statistics
A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability of choosing a marble that is not blue?
Friday, March 10, 2017 by uos

Statistics
Suppose that on average 10% of the people with an airline-ticket doesn't show up at the flight.For a certain flight, the plane has 100 seats and 110 tickets are sold. What is the probability that everyone who shows up will have a seat?
Tuesday, March 7, 2017 by Rechal

Online Statistics Tutor
Are you looking for a flexible a way to earn extra cash? Become an online statistics tutor at got it! and start earning instantly! At got it!, we help thousands of students learn every day. Our online tutors are an important part of our learning community, and assist students ...
Monday, March 6, 2017 by got it!

Statistics
if P(A) =1/2 and P(B)= 2/3, can the events A and B be mutually exclusive, why or why not?
Monday, March 6, 2017 by yajaira

Statistics
Based on sq foot and home prices :Create an inferential statistics (hypothesis) test using the research question and two variables your learning team developed for the Week 2 Business Research Project Part 1 assignment. Include: The research question Mock data for the ...
Sunday, March 5, 2017 by Brenda

Stastics
USA snapshot presented a bar graph depicting business travelers’ impression of wait times in airport security lines over the past 12 months. Statistics were derived from Travel Industry Association of American Business Traveler Survey of 2034 respondents. Could this be a ...
Saturday, March 4, 2017 by Valarie

STATISTICS
An urn contains 14 white balls and 6 red balls. two balls are to be selected in succession, at random and without replacement what is the probability that i) both balls are white, ii) the first ball in white and the second ball is red, iii) one white ball and one red ball are ...
Saturday, March 4, 2017 by ANIRBAN

STATISTICS
it is given that 3% of electric blubs manufactured by a company are defective using poisson approximation find that a sample of 100 bulbs will contain no defective exactly one defective bulb
Saturday, March 4, 2017 by ANIRBAN

Statistics Maths
Iam confused by this and need some help not sure if I am right about this = 3000-7.3x x 50 = 2635 regression equation: number of tickets = 3000 - 7.3x, where x = ticket price. If Yoncebé prices the tickets at $50, how many tickets is she predicted to sell?
Friday, March 3, 2017 by claire

Statistics
A basket ball player makes 70% of her free throws. She takes 7 free throws in a game, and makes 5 of her 7 throws. If the shots are independent of each other, Then what is the probability that she makes the first five and misses the last 2?
Friday, March 3, 2017 by Niki

Statistics
A manufacturer estimates that when x units of a particular commodity are produced each month, the total cost (in dollars) will be C(x) = 1/8x^2+4x+200 and all units can be sold at a price of p(x) = 49 - x dollars per unit. Determine the price that corresponds to the maximum ...
Friday, March 3, 2017 by Jack

Statistics
The table to the right lists probabilities for the corresponding numbers of girls in three births. What is the random​ variable, what are its possible​ values, and are its values​ numerical? Number of girls x ​P(x) 0 0.125 1 0.375 2 0.375 3 0.125
Thursday, March 2, 2017 by Nancy

Statistics
by what factor should the sample size in a poll be increased in order to cut the margin of error in half
Tuesday, February 28, 2017 by Andrzej

Statistics
by what factor should the sample size in a poll be increased in order to cut the margin of error in half
Tuesday, February 28, 2017 by Andrzej

stats
a statistics professor rolls two balanced dice. Both fall to the floor and roll under his desk. A student in the first row informs the professor that he can see both dice. He reports that at least one of them shows a “five”. What is the probability that the other die is ...
Friday, February 24, 2017 by Samantha

statistics
professor rolls two balanced dice. Both fall to the floor and roll under his desk. A student in the first row informs the professor that he can see both dice. He reports that at least one of them shows a “five”. What is the probability that the other die is also “five”?
Friday, February 24, 2017 by Samantha

statistics
If it is discovered that 65 out of 12,800 records are misfiled, what is the filing accuracy rate?
Friday, February 24, 2017 by Deitra

Statistics
A coin is tossed 7 times. What is the probability that the number of heads obtained will be between 2 and 4 inclusive? Express your answer as a fraction or a decimal number rounded to four decimal places.
Wednesday, February 22, 2017 by Sadie

History
Please check my answers. Question 1(Multiple Choice Worth 5 points) [06.06 MC] Which answer best describes how the Supreme Court viewed Maryland's taxing of the national bank created after the War of 1812? The Supreme Court decided Maryland was within its rights as a state. ...
Wednesday, February 22, 2017 by Anonymous

Statistics
Researchers recruited 20 volunteers- 8 men and 12 men omen- to take part in an experiment
Tuesday, February 21, 2017 by Anonymous

Statistics
A physical fitness association is including the mile run in its secondary-school fitness test for boys. The time for this event for boys in secondary school is normally distributed with a mean of 450 seconds and a standard deviation of 40 seconds. If the association wants to ...
Tuesday, February 21, 2017 by Jordan

Statistics
The Information Systems Audit and Control Association surveyed office workers to learn about the anticipated usage of office computers for personal holiday shopping (USA Today, November 11, 2009). Assume that the number of hours a worker spends doing holiday shopping on an ...
Monday, February 20, 2017 by Kelly Luth

Statistics
Wendy's restaurant has been recognized for having the fastest average service time among fast food restaurants. In a benchmark study, Wendy's average service time of 2.2 minutes was less than those of Burger King, Chick-fil-A, Krystal, McDonald's, Taco Bell, and Taco John's (...
Monday, February 20, 2017 by Kelly Luth

Statistics
A CBS News/New York Times survey found that 97% of Americans believe that texting while driving should be outlawed (CBS News website, January 5, 2015). a. For a sample of 10 Americans, what is the probability that at least 8 say that they believe texting while driving should ...
Monday, February 20, 2017 by Jack Rogers

Statistics
Find the area under the standard normal curve between z = 0 and z = 1.37.
Saturday, February 18, 2017 by Sharon

Language Arts
Hi! I just need someone to check my work please! :) Thanks! 1. Which of these is the defining characteristic of a comparison-and-contrast essay? A. Clear thesis statement. B. Organizational structure. C. Reliable sources. D. Similarities and differences between two or more ...
Friday, February 17, 2017 by Emma

Statistics
Find the area under the standard normal curve between z = 0 and z = 1.37.
Thursday, February 16, 2017 by Sharon

math statistic
One of your friends knows that you are taking Advanced Placement Statistics and asks for your help wither Chemistry lab report. She has come up with five measurements of the melting point of a compound: 122.4, 121.8, 122.0, 123.0, and 122.3 degrees Celsius. a. The lab manual ...
Thursday, February 16, 2017 by rhinechilde

Statistics
The probability that a randomly selected two-year-old male stinkbug will live to be three years old is .59963 what is the probability that to randomly selected two-year-old male stinkbugs will live to be three years old? What is the probability that for randomly selected two-...
Wednesday, February 15, 2017 by Audrey

statistics and probability
n a written test given to a large class comprising 42 students, the test scores were found to be normally distributed with a mean of 78 and a standard deviation of 7. A minimum score of 60 was needed to pass the test. A score of 90 or greater was needed to earn an A in the ...
Tuesday, February 14, 2017 by faye

statistics and probability
A company has been studying the performance of their sales department. The measure of performance used is: average monthly sales amount in dollars. For the past 12 months, the average monthly sales amount has been $4,532 with a standard deviation of $386. Calculate the ...
Tuesday, February 14, 2017 by faye

statistics and probability
5. A fastener company is supplying washers to a manufacturer of kitchen appliances who has specified that the outside diameter be 0.500 ± 0.025 inch. Measurements made on 250 washers show that the process is in good statistical control, the diameters are normally distributed...
Tuesday, February 14, 2017 by faye

Math-Statistics
CAN SOMEONE HELP ME WITH THIS? A recent study found that, of the 1771 participants aged 12 to 19 in the National Health and Nutrition Examination Survey, 19.5% had some hearing loss (defined as a loss of 15 decibels in at least one ear). This is a dramatic increase from a ...
Tuesday, February 14, 2017 by Kate

Statistics
A bin of 35 manufactured parts contains 6 defective parts and 29 non-defective parts. A sample of size 5 parts is selected from 35 parts. Selected parts are not replaced. How many different samples are there of size five that contain exactly 2 defective parts? What is the ...
Tuesday, February 14, 2017 by Bryan

Statistics
Assume that the mean systolic blood pressure of normal adults is 120 millimeters of mercury (mm Hg) and the standard deviation is 5.6. Assume the variable is normally distributed. If an individual is selected, find the probability that the individual's pressure will be between...
Sunday, February 12, 2017 by Anonymous

Statistics for Finance
Question 3 [17 Marks) There are five (5) set of data; A to E is provided for this question. Each group will be assigned to analyze ONE dataset only and answer the questions below. The assigned dataset will be determined by your lecturer in separate announcement in MMLS. Below ...
Saturday, February 11, 2017 by MohammedFarhanKhan

Statistics
According to Chebyshev’s theorem, what proportion of a distribution will be with k=4 standard deviations of the mean? Show all work as to how to find this. I have no idea on how to do this. HELP!!!!
Friday, February 10, 2017 by Sharon

Statistics
I am having a really rough time figuring out how this expected value was found in this Chi Square problem. 272 flies had long normal wings 60 flies had dumpy wings I know it's going to be a 3:1 ratio, and I know that 272 and 60 are my observed variables. This is how the table ...
Thursday, February 9, 2017 by Ellie

Math Statistics
"In the United Kingdom's Lotto game, a player picks six numbers from 1 to 49 fir each ticket. Rosemary brought one ticket for herself and one for each of her four adult children. She had the lottery ticket. When the sic winning numbers were drawn, Rosemary was surprised to ...
Tuesday, February 7, 2017 by Katherine

statistics
On a entrance exam, the mean was 50 and standard deviation was 5. If Ricky's z-score was -1.5, what was his exam score? I don't have a clue how to start to answer this question...
Tuesday, February 7, 2017 by stephanie

statistics
The closing price of Schnur Sporting Goods Incv. common stock is uniformly distributed between $20 and $30 per share. Draw the uniform distribution. What are the height and base?
Saturday, February 4, 2017 by eric

statistics
You are responsible for planning the parking needed for a new 256-unit apartment complex, and you are told to base the needs on the statistic “average number of vehicles per household is 1.9.” Which average (mean, median, mode) would be best if: • You wanted to be ...
Friday, February 3, 2017 by Sharon

statistics
Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so. * The nurses on the 5th floor record the medicines administered every day and report results to the doctors. don't understand at all
Friday, February 3, 2017 by Sharon

Statistics Math
Let A and B be two exclusive events with P(A)=.2 and P(B) =.3. Find P(A|B)
Thursday, February 2, 2017 by Nicole

Statistics
A teacher gives a reading skills test to a third-grade class of n = 25 at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores showed an average improvement of MD = 12.7 points...
Thursday, February 2, 2017 by Derek

Elementary statistics
Prove the demorgans second law (anb)'=(a'ub'). Sho that au(bnc)=(aub)n(auc).
Thursday, February 2, 2017 by Bulama dgn

Statistics (elementary probability theory)
In an examination 60 candidates offer maths, 80 offer english,and 50 offer physics, if 20 offer maths & english, 15 offer english & physics, 25 offer math & physics and 10 offer all the 3. How many students entered to the examination ?
Thursday, February 2, 2017 by Bulama dgn

Statistics
3 batteries are chosen at random from 15 batteries of which 5 are defective. Find the probability if: 1) none of 3 are defective 2) exactly one is defective 3) 2 defective and 1 non-defective 4) at least one is non-defective What should I do? Is it permutation or a combination...
Sunday, January 29, 2017 by Someonehunidshelp

statistics
. At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the p-value?
Sunday, January 29, 2017 by DEBORAH SLIGH

statistics
For a sample of 50 days, George Murnen made an average of 5.02 calls per day. At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the p-value?
Sunday, January 29, 2017 by DEBORAH SLIGH

statistics
Bill has completed a 10-question multiple-choice test on which he answered 7 questions correctly. Each question had one correct answer to be chosen from five alternatives. Bill says that he answered the test by randomly guessing the answers without reading the questions or ...
Saturday, January 28, 2017 by elegantina

Research
Are statistics of something considered to be a research ?
Thursday, January 26, 2017 by Art

Statistics
In group of three friends what is the probability that at least two have the same birthday?
Thursday, January 26, 2017 by mitch

Statistics
Ive downloaded 3 journal articles, i just neeed someone to help me identify the ststistical procedures used in each articles Can somebody who knows ststistics plesse help me... How do u want to read theses 3 short journsl articles? Plesse i beg u
Wednesday, January 25, 2017 by Joy

PSYDAG Statistics ( no computation)--help please
Hi first what are statistical tools? What are statistical procedures? can you give an example of each and a brief definition? next Our assignment is to look for 3 very short/short (as much as possible please)journal articles about psychology or anthropology or social ...
Wednesday, January 25, 2017 by Joy

Math, Statistics
If P(A)=.3 and P(B)=.45 find… P(A or B) if A and B are 1)mutually exclusive & 2)independent. Also, I need help understanding what independent and mutually exclusive means and what that does.
Tuesday, January 24, 2017 by Jillian

Statistics
If the standard deviation of a sample is 12 inches, then the variance is 144 sq. inches. Do you agree? Can you try?
Sunday, January 22, 2017 by Elegantina

Mental Health
If the correlation between one’s interest in statistics and being a “fun date” was –0.70, it would mean that: a. The higher someone’s interest was in statistics, the more likely it would be that he or she is a fun date b. The higher someone’s interest was in ...
Sunday, January 22, 2017 by A

behavior health
According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test? a. 0.40 b. 0.50 c. 0.80 d. 0.90 I selected C for my answer 40/50 is the .80 If the correlation between one’s interest in ...
Sunday, January 22, 2017 by A

Statistics
An observation was drawn from a normally distributed population with mean 2.397 and standard deviation 0.612. If the observed value is 3.144, find the z-score.
Sunday, January 22, 2017 by Karyn

PsyDAG How can i inteview you?
remember that statistics assignment of ours? pleaseee
Saturday, January 21, 2017 by AJ

Data analysis statistics and probability
6. If the average temperature in February was 55°F arch was 64°F April was 74°F, and Ma was 85°F men which month had the smallest gain in average temperature over the previous month? A. February B. March C. April D. May
Tuesday, January 17, 2017 by Jancy

Math (misleading graphs) (Statistics)
When constructing a graph showing the population of two​ countries, an illustrator draws two different people with heights proportional to the populations. Identify a way in which the graph might be misleading. What is the general name for such graphs that use drawings of ...
Monday, January 16, 2017 by Ray

statistics
A random variable has aprobability function p(x)=kx; x=1,2,3,4,5.find the value of k, p(x>=3),compute mean and variance of x.
Sunday, January 15, 2017 by ahmed

Statistics
in a medical examination, 300 people undergo a height measurement and was found out that the average height of all are 150cm. if the standard deviation is 19, find the number of people that fall under the given conditions: a)with the height less than 132cm. b)with height from ...
Tuesday, January 10, 2017 by Ej

American Government
Please check my answers 1. Which kind of policy was the troubled asset relief program (TARP)? A. It was a fiscal policy and I could buy the federal government to prevent inflation B. It was a monetary policy enacted by the federal government to expand the economy C. It was a ...
Friday, January 6, 2017 by M

Statistics
A two-digit number is written down at random.Find the probability that the number will be A)Smaller than 20 B)Even C)Multiple of 5
Wednesday, January 4, 2017 by Rukhsar

Statistics
Add a carnival, you play ring toss game 30 times. It's only a dollar to play, and your chances of winning the five dollar prize are advertised at 15%! What are your expected winnings?
Monday, January 2, 2017 by Anonymous

Statistics
A population of values has a normal distribution with μ=76.6 and σ=43.9 You intend to draw a random sample of size n=142. Find P75, which is the score separating the bottom 75% scores from the top 25% scores.
Monday, January 2, 2017 by Zameer

Statistics
A driver comes to pick up members of your family for a family reunion. The van holds 7 people, not including the driver. Assuming that none of the babies will be riding in the van, how many different ways can 7 people be chosen to ride in the van?
Thursday, December 29, 2016 by muzammil yasin

Probability & Statistics
The life expectancy (in hours) of a fluorescent tube is normally distributed with a mean 8000 and a standard deviation 1000. Find the probability that a tube lasts for more than 11000 hours.
Friday, December 23, 2016 by Gen

Statistics
The monthly salaries (in thousands of dollars) of a sample of sales representatives are as follows: 13, 7, 10, 9, 8, 13 Find the standard deviation of this sample of monthly salaries. Round your answer to at least two decimal places.
Thursday, December 22, 2016 by Anonymous

College Statistics
How much should you invest each month in order to have $800,000 if your rate of return is 5.3% compounded monthly and you want to achieve your goal in 40 years? How much interest will you earn? How much should you invest each month in order to have $800,000 if you want to ...
Friday, December 16, 2016 by onlyzoe_!

statistics
construct a probability distribution for18 boys and 24 girls
Wednesday, December 14, 2016 by annonymous

statistics
0.95 of confidence find the confidence interval for the mean
Tuesday, December 13, 2016 by fara

statistics
0.95 degree of confidence find the confidence interval for the mean of the whole population
Tuesday, December 13, 2016 by fara

statistics
a normal distribution has a mean of 20 and a standard deviation of 10. Two scores are sampled randomly from the distribution and the second score is subtracted from the first. What is the probability that the difference score will be greater than 5?
Tuesday, December 13, 2016 by Velvet

english
What does the author achieve by mixing exact and approximate numbers in "A Contribution to Statistics?"
Sunday, December 11, 2016 by ilovegot7

Math check - Statistics
Can someone (preferably one of the long-term tutors) check my answers: Researchers trap 23 devils, and find that 18 of them are infected. Provide an estimate of disease prevalence. p-hat = (18/23)=0.783 Part II: assuming the same disease prevalence from above. If they trap 2 ...
Sunday, December 11, 2016 by Jeremy

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Homework Help: Math

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