Monday
September 26, 2016

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
The amount of Jen's monthly phone bill is normally distributed with a mean of $55 and a standard deviation of $12. Calculate the z score for each scenario. What percentage of her phone bills are above 79? What percentage of her phone bills are between $31 and $79. What ...
Sunday, September 25, 2016 by Amy Penn

statistics
x is normally distributed and that sample of 20 yields a mean of 42 and a variance of 25 test the hypothesis that the population standard deviation is 8 at 5% significance level.
Sunday, September 25, 2016 by Sasanka

Stats, Statistics, Math
A Statistics professor assigned 10 quizzes over the course of the semester. He wanted to see if there was a relationship between the total mark of all 10 quizzes and the final exam mark. There were 229 students who completed all the quizzes and wrote the final exam. The ...
Saturday, September 24, 2016 by Papi

Statistics
Direct mail advertisers send solicitations​ ("junk mail") to thousands of potential customers in the hope that some will buy the​ company's product. The response rate is usually quite low. Suppose a company wants to test the response to a new flyer ...
Thursday, September 22, 2016 by Iresse

Statistics
Direct mail advertisers send solicitations​ ("junk mail") to thousands of potential customers in the hope that some will buy the​ company's product. The response rate is usually quite low. Suppose a company wants to test the response to a new flyer ...
Thursday, September 22, 2016 by Iresse

Statistics
Consider the following data set: 3, 4, 6, 7, 9, 9, 11. Identify a number you could add to the set to keep the mean equal to the median. Please help me out. I have no idea how to find this and my lesson doesn't explain how to do it either. I already know that the mean and ...
Thursday, September 22, 2016 by Me

Statistics
The weight of 100 females aged 15 to 20 years has a mean of 120 pounds and a variance of 36 pounds. How many of the students has a weight less than 110 pounds?
Thursday, September 22, 2016 by Chyrie lhu

statistics
A test consists of 5 multiple questions each of which 3 answers are given, only 1 of which is correct.for each correct answer a candidate gets 2 marks but loses 1 mark for each incorrect answer.draw up table to show all possible marks and a probability associated with each ...
Thursday, September 22, 2016 by faith

statistics
Assume the lifespan of light bulbs manufactured by Bright Inc. can be modeled with a normal distribution with a mean of 300 days and a standard deviation of 40 days. 70% of light bulbs produced by Bright Inc. survive longer than how many days?
Wednesday, September 21, 2016 by Saralynn Niealsen

Statistics
In a sample of 20 men, the mean height was 178 cm. In a sample of 30 women, the mean height was 164 cm. What was the mean height for both groups put together? The answer I got by adding the two means and dividing them by 2 is 171 but it is wrong, it must be 169.9, how can I ...
Tuesday, September 20, 2016 by W

college- practical statistics
Five coins are tossed 3200 times find the frequencies of distribution of heads & tails & tabulate the results. Calculate the mean number of success & the standard deviation.
Monday, September 19, 2016 by sathya

Statistics
From a sample with n equals=24​, the mean number of televisions per household is 3 with a standard deviation of 1 television. Using​ Chebychev's Theorem, determine at least how many of the households have between 1 and 5 televisions.
Sunday, September 18, 2016 by Addison

statistics
A population of N = 10 scores has a mean of μ = 24. If one person with a score of X = 42 is removed from the population, what will be the value for the new mean?
Friday, September 16, 2016 by patrick

statistics
In general, increasing the sample size (for example, from n = 4 to n = 50) will ____ the risk of a Type I error. (Assume alpha is held constant at .05.) Select one: a. decrease b. increase c. have no influence on
Friday, September 16, 2016 by anna

stats
The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 range = 60 mode = 165 variance = 324 median = 170 The coefficient of variation equals: a.0.1125% b.11.25% c.203.12% d.0.20312% Do I have to find the ...
Thursday, September 15, 2016 by Ana

statistics
The weekly study times for all students in a school are normally distributed with μ = 18 hours and σ = 6 hours. If 36 students are randomly selected, find the probability that their mean study time is greater than 20 hours. My work: 20-18/(6/√36)=2/(6/6)=2/1=2...
Thursday, September 15, 2016 by Judy

Statistics
A signal is transmitted over a noisy channel. It is known that the signal will be correctly received with probability 0.797. If 3 copies of the signal are independently sent over this channel, what is the probability that at least one of them is received correctly? My thought ...
Wednesday, September 14, 2016 by Janea

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 variable of interest, determine whether it is discrete or continuous and list some ...
Tuesday, September 13, 2016 by AprylB

Statistics
The Virginia Department of Social Services collected information on 25 Virginia Supplemental Nutrition Assistance Program (SNAP, formerly Food Stamps) beneficiaries and found that their average monthly food expenditure was $160. The average monthly food expenditure for SNAP ...
Monday, September 12, 2016 by REDGY22

Statistics
Free Throw Freddie is an 80% free throw shooter. At the end of practice he shoots until he makes 10 shots. a) What is the probability that Freddie makes 10 in a row? b) What is the probability that Freddie needs 15 or more attempts? I understand how to do part a), but I'm ...
Sunday, September 11, 2016 by Zach

Statistics
I have a bag with 2 different kinds of objects: 11 cubes, 16 spheres. If I randomly pick from the bag 5 of these objects without return any of it, what is the probability of getting at least 1 of each kind?
Saturday, September 10, 2016 by Nathan

statistics
the response to a question has three alternative a, b, c, a sample of 120 responses provides 60 a, 24 b, 36 c. show the frequency and relative frequency distributions
Thursday, September 8, 2016 by susu

statistics
A restaurant menu has 5 kinds of soups, ten kinds of main courses, six kinds of desserts, and eight kinds of drinks. If a customer selects one item from each category, how many different outcomes are possible?
Wednesday, September 7, 2016 by jelai

statistics
Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.
Monday, September 5, 2016 by Barbara

Statistics
The average score for a business examination comprising 300 students is 54%. If the marks are normally distributed with a standard deviation of 8%, determine the number of students scores above 70%.
Monday, September 5, 2016 by Dmaster

Statistics
A movie theater has a super ultra combo meal. It includes the option of a large popcorn, a soda, a slice of pizza, and a box of candy. There are 12 types of toppings for the popcorn, including no topping. There are 5 types of toppings for the pizza, including no topping. The ...
Monday, September 5, 2016 by Nathan

Statistics
In a group of 54 candidates, 16 are female and the remaining are male. If four are to be randomly selected, what is the probability that there will be only female candidates selected?
Sunday, September 4, 2016 by Jason

Statistics
The probability that a randomly chosen person in Botswana is 65 or older is approximately 0.2. a) What is the probability that, in a randomly selected sample of 6 people, exactly 4 of them are 65 or older. If X IS THE NUMBER of people of age 65 or older in a sample of 6, ...
Sunday, September 4, 2016 by mbambo

Pathway to Statistics
a. What value of T represents the temperature that is 16°F below​ zero? b. A student says that T represents only positive numbers and​ zero, because there is no negative sign. Is the student​ correct? Explain
Thursday, September 1, 2016 by Sam

Statistics
How do I answer: A normal distribution has a standard deviation equal to 39. What is the mean of this normal distribution if the probability of scoring above x = 209 is 0.0228
Thursday, September 1, 2016 by Brian

AP statistics
A group of students were asked to guess the width of the room in feet, measured to the nearest foot (1 meter = 3.28 feet, to 2 decimal places). Construct a back to back stemplot from these two datasets. How will you overcome the problem that different units are used in the two...
Tuesday, August 30, 2016 by Leah

Statistics
A poll of a random sample of 100 UNAM students revealed that 82 are football fans and 62 are rugby fanatics draw a venn diagram
Monday, August 29, 2016 by Raphael

Statistics
Of the 40 students in a gym class, 13 played volleyball, 12 ran track (4 of whom did a push up), and the remainder were absent. A.) What proportion of the class ran track? B.) What percentage played volleyball? C.) What percentage of the runners did a push up? D.) What ...
Thursday, August 25, 2016 by Daisy

statistics
Select the TWO options that are TRUE statements about two-sample t-tests. Select one or more: The same formula is used for the ESE (estimated standard error) in the two-sample t-test with a common variance and the two-sample t-test with unequal variances. A researcher has ...
Tuesday, August 23, 2016 by mina

statistics
a bag contains 4 blue marbles,6 red marbles, 10 yellow marbles and 6 green marbles.What is the probability of not drawing a red marble?
Tuesday, August 23, 2016 by dennis

statistics
Select the TWO options that are TRUE statements about two-sample t-tests. Select one or more: The same formula is used for the ESE (estimated standard error) in the two-sample t-test with a common variance and the two-sample t-test with unequal variances. A researcher has ...
Sunday, August 21, 2016 by mina

Business statistics
You chose a simple random sample of 300 guests you develop a 95 percent confidence interval estimate you found the following 325 and 32 determine the standard error of the sampling distribution determine the critical value z from the standard normal table compute the ...
Sunday, August 14, 2016 by Kim

Statistics
Survey of 115 families chosen at random, having 5 children it was observed that the distribution was as follows The 5 children are girls is 6 There is one boy and four girls is 18 There are two boys and three girls is 35 There are three boys and two girls is 30 There are four ...
Saturday, August 13, 2016 by Huruva Nomore

probability statistics
how many bridge hands are possible containing 4 spaders, 6 diamonds , 1 club and 2 heart?
Saturday, August 13, 2016 by jamie

probability statistics
how many numbers between 4000 and 7000 can be choosen using digita 0,1,2,3,4,5,6,7 and 8 if each digit must not be repeated in any numbers?
Friday, August 12, 2016 by jhenny

statistics
how many arrangements can be made from the word MATHEMATICS when all are taken at a time ?
Friday, August 12, 2016 by jella

math
Based on the data collected by the National Centre for health Statistics and made available to the public in the Sample Adult database, it was found that the percentage of adults who have at some point in their life been told that they have hypertension was 15%. Suppose that a...
Thursday, August 11, 2016 by lucia

probability statistics
A jar contains 6 red, 7 white, and 7 blue marbles. If a marble chosen at random. Find the following probabilities? A)P(red) B)P(white) C)P(red or blue) D)P(red and white)
Wednesday, August 10, 2016 by charles

statistics
i have a little bit of trouble finding the first and second quartile of this data set:78,91,88,83,84. I know my median is 88,but i cannot see a way to find Q1 ad Q3,plz help!!😄
Monday, August 8, 2016 by Mirandal

Applied Stats
Based on the data collected by the National Centre for health Statistics and made available to the public in the Sample Adult database, it was found that the percentage of adults who have at some point in their life been told that they have hypertension was 24 percent. Suppose...
Monday, August 8, 2016 by Anonymous

statistics
A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively; each unit of B requires 3, 4 and 1 kilograms of ...
Monday, August 8, 2016 by mary

statistics
a survey conducted by the u.s department of labor found the 48 out of 500 heads of house holds were unemployed compute a 99% confidence interval for the proportion of unemployed heads of households what is the upper and lower limits round the answers to three decimals
Friday, August 5, 2016 by bernie

statistics
the diameter of red apples of an orchard have a normal distribution with a mean of 3 inches ans standard deviation of 0.5 inches one apple will be randomly chosen. what is the probability of picking an apple with a diameter less than 2.15 inches
Tuesday, August 2, 2016 by bernie

Statistics
A production line operation is designed to fill cartons with laundry detergent to a mean weight of 32 ounces. A sample of cartons is periodically selected and weighed to determine whether underfilling or overfilling is occurring. If the sample data lead to a conclusion of ...
Saturday, July 30, 2016 by Gary

statistics
in a certain college 33% of the physics majors belong to ethnic minorities. if 8 students are selected at random from the physics majors what is the probability that more than 5 belong to an ethnic minority
Saturday, July 30, 2016 by bernie

statistics
i made a typo i meant to say what is the probability that both are obese
Friday, July 29, 2016 by bernie

statistics
according to the health and exam survey (1999-2008)35.7% of u.s adults were consdered obese(body mass greater then30)if two people in the u.s are selected at random is the probability that both are obese
Friday, July 29, 2016 by bernie

statistics
twenty light bulbs are tested three light bulbs fail the test. two light bulbs are selected at random without replacement from this collection of bulbs find the probablilty that both light bulbs failed the test. round the answer 3 decimals places
Friday, July 29, 2016 by bernie

statistics
can someone help me with the question i asked please thank you
Friday, July 29, 2016 by bernie

statistics
twenty light bulbs are tested to see if they claims last long as the manufacturers claims they do. three light bulbs failed the test. two light bulbs are selected at random without replacement from this collection of bulbs find the probability that both light bulbs failed the ...
Friday, July 29, 2016 by bernie

statistics
can i get help with my question thank you
Friday, July 29, 2016 by bernie

Statistics
The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 7.3 years. What percentage of individual aircraft have ages greater than 15 ​years?
Tuesday, July 26, 2016 by Shawn

statistics
y=8+13x
Monday, July 25, 2016 by william

statistics
2424​% of college students say they use credit cards because of the rewards program. You randomly select 10 college students and ask each to name the reason he or she uses credit cards. Find the probability that the number of college students who say they use credit ...
Monday, July 25, 2016 by Anonymous

Statistics
Assume that​ women's heights are normally distributed with a mean given by mu equals 63.8 inμ=63.8 in​, and a standard deviation given by sigma equals 3.1 inσ=3.1 in. Complete parts a and b.
Sunday, July 24, 2016 by Keith

statistics
find the number of units that must be produced to break even. R(x)=200x - x^2 C(x)= 70x +2200 0 < x < 100 (These < are supposed to b less than or equal to signs)
Wednesday, July 20, 2016 by Anonymous

statistics
What is straight line depreciation for an item that costs $15,951. whose life is 13 years?
Wednesday, July 20, 2016 by Anonymous

statistics
2) sue, a botanist, is studying a new plant seed. if it is known that these seeds have a 95% probability of germinating. if sue plants 6 seeds, what is the probability that; a) exactly four seeds will germinate? b) at least five will germinated? c) at most one will not ...
Monday, July 18, 2016 by nancy

statistics
sue, a botanist, is studying a new plant seed. if it is known that these seeds have a 95% probability of germinating. if sue plants seeds, what is the probability that; a) exactly four seeds will germinated? b) at least five will germinated? c) at most one will not germinated?
Sunday, July 17, 2016 by nancy

statistics
A basketball player makes 60% of the free throws that he attempts, except that if he has just tried and missed a free throw then his chances of making a second one go down to only 30%. Suppose he has just been awarded two free throws. Find the probability that he makes both. ...
Saturday, July 16, 2016 by john

statistics
sue, a botanist, is studying a new plant seed. if it is known that these seeds have a 95% probability of germinating. if sue plants seeds, what is the probability that; a) exactly four seeds will germinated? b) at least five will germinated? c) at most one will not germinated?
Saturday, July 16, 2016 by nancy

statistics
If 6 bass are randomly selected from Clear Lake, find the probability that the mean weight is greater than the mean of those you caught
Wednesday, July 13, 2016 by Anonymous

statistics
In a shipment of mangoes , 90
Wednesday, July 13, 2016 by che

statistics
If P(A)=11/13, find P(Ā) Find the indicated probability
Monday, July 11, 2016 by Anonymous

Math
2. The following is a random sample of grades achieved on statistics examination by 10 male students in a very large class and a random sample of grades achieved by 8 female students. Male 78 87 75 64 90 80 65 86 74 81 Female 71 50 80 75 90 61 85 81 Test at  = 0.01 ...
Sunday, July 10, 2016 by Paulo

statistics
A large school district would like to estimate the mean score for all of its 5th grade students on a certain mathematics achievement test known to produce scores that are normally distributed in this population. In a pilot study, n = 25 randomly selected 5th graders take the ...
Saturday, July 9, 2016 by ella

Statistics
A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if he wishes the estimate to be within four percentage points with 99 ​% confidence, ...
Wednesday, July 6, 2016 by Zechariah

statistics
A jar contains 2 red balls, 2 blue balls, 2 green balls and 1 orange ball. Balls are randomly selected, without replacement, until 2 of the same colour are obtained. Calculate the probability that more than 3 balls must be selected.
Saturday, July 2, 2016 by peter

Reserach Statistics in CRJU
A data set has n=10 pairs of X and Y values. This data has SSx=10, SSy= 20 and SP=10. Compute the Pearson correlation and explain r=sp/√ssx ssy = 10/√10*20= 10/√200 Simplify 200 under radical= 200 as 10^2⋅2. √(〖10〗^2 )×2= 10/...
Thursday, June 30, 2016 by Michelle

C++
My assignment: 1- Rewrite your C++ program in Project 1 to compute the number of words, average length and lengths of the words in the text file words.txt – the input file. Each line in the input file contains exactly one word. The words in the input file are sorted ...
Thursday, June 30, 2016 by Josh

Statistics
In a sample of 1000 tires, with a mean of 250 miles per tire....about how many tires will last longer than 300 miles?
Thursday, June 30, 2016 by Wade

Statistics
example of a finished apa independent project with between subjects and analysis of variance
Friday, June 24, 2016 by KT

Statistics
Choose and observational study for and independent project using 3 between subjects and Anova
Friday, June 24, 2016 by KT

Probability and statistics
Astronomers treat the number of stars in a given volume of space as a Poisson random variable. The density in the Milky Way Galaxy in the vicinity of our solar system is 1 star per 16 cubic light years. (a) What is the probability of 3 or more stars in 16 cubic light years? (b...
Thursday, June 23, 2016 by Sarah

statistics
a student takes a true false test that has 13 questions and guesses randomly at each answer. Let X be the number of questions answered correctly. Find P(fewer than 4)
Wednesday, June 22, 2016 by debbie

Statistics
many ground level plants in tropical rainforest have adapted to the shade of the forest canopy. these plants tend to function well as house plants since they require minimal sunlight. A botanist is interested in domesticating a particular plant found in the amazon rainforest...
Wednesday, June 22, 2016 by mia

Statistics
a sample of n=25 scores has a mean of M=65 and an estimated standard error of 2 points. What is the sample variance
Wednesday, June 22, 2016 by L

English
Complete the following sentence. _____ often answer the questions who, what, why, when, or where. Supporting details (MY ANSWER) Statistics Reading strategies Graphic organizers
Tuesday, June 21, 2016 by Nikki

statistics
A coin is biased so that the probability of obtaining a head is 2/3. The coin is tossed four times. Find the probability of obtaining exactly two heads.
Tuesday, June 21, 2016 by Laura

statistics
. What is inferred by the 95% confidence interval of the mean?
Friday, June 17, 2016 by Anonymous

statistics
A study was performed on green sea turtles inhabiting a certain area. Time-depth recorders were deployed on 6 of the 76 captured turtles. The time depth recorders allowed the scientists to track the movement of turtles in the area. The 6 turtles had a mean shel length of 51.2 ...
Thursday, June 16, 2016 by PLEASE HELP ME

statistics
the verbal section of GRE exam for admission into graduate school has a mean of 456 (s=140). Assuming the scores are normally distributed what percent of students will score 600 or higher? (choose range that fits your answer)
Thursday, June 16, 2016 by marisa

Civics
Speaker 2: The law would make anyone who looks under 18 without an ID after dark into a criminal. That's not the answer; that's a police state. Confining innocent youth to house arrest does not make young people more responsible. Jan decides to do some more research on...
Wednesday, June 15, 2016 by Frisk

statistics
For a population with a mean of 80 and a standard deviation of 10, what is the Z score corresponding to an individual score of 95?
Wednesday, June 8, 2016 by tonya

Economics
A student taking economics, statistics, and finance has decided to spend 9 hours per week studying. The objective is to maximize the average grade, which means maximizing the total grade in the three courses. 1. How should the student allocate her time
Wednesday, June 8, 2016 by tonya

Statistics
If is confirm that two thirds of the students of a college are females, calculate the probability that on entering the college, the first two students one meet are (i) the same gender (ii) different gender
Monday, June 6, 2016 by Danbaba

Statistics
We investigate if a period of time feels longer or shorter when people are bored compared to when they are not bored. Using independent samples, we obtain these estimates of the time period (in minutes):
Saturday, June 4, 2016 by Kassi

statistics
the amount of pyridoxine in grams per multiple vitamin is normally distributed with mean = 110 grams and standard deviation = 25 grams. What is the probability that a randomly selected vitamin will contain between 100 and 110 grams of pyridoxine?
Friday, June 3, 2016 by james

Vocabulary
A large group of homes A. Development B. Technology C. Communication D. Statistics B?
Thursday, June 2, 2016 by quick help needed

Vocabulary
Building and construction A. Nursing B. Architecture C. Teaching D. Statistics B?
Thursday, June 2, 2016 by quick help needed

Statistics
Find the number x such that the proportion of observations that are less than x in a Normal distribution with mean 100 and standard deviation 25 is 0.3. (Use 2 decimal places.)
Tuesday, May 31, 2016 by Sarah Lacks

Statistics
Suppose a fair coin is tossed five times and let x be the number that turned up in those five times. **the mean and the standard deviation are respectively... a.) 0.5, 0.5 b.) 2.5, 0.5 c.) 2.5, 2.24 d.) 2.5, 1.12 **find P(x≥1) a.) 0.5 b.) 1.0 c.) 0.03 d.) 0.97 * i just ...
Monday, May 30, 2016 by Caitlyn

statistics
How large a sample is needed to be able to estimate the proportion to within plus or minus 3% and be 95% sure the estimate is correct? frame contains approximately 25,000.do not take nonresponse into account.
Sunday, May 29, 2016 by Garth

Statistics
A certain disease occurs in 4% of the population. A blood test for this disease shows a false positive 12% of the time. That means a test will show positive given that the person does not have the disease. What is the probability that a person tests positive but does not have ...
Wednesday, May 25, 2016 by Ashley

statistics
2. At a local university, a sample of 49 evening students was selected in order to determine whether the average age of the evening students is significantly different from 21. The average age of the students in the sample was 23 years. The population standard deviation is ...
Tuesday, May 24, 2016 by raj

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Homework Help: Math