Thursday
September 3, 2015

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
Find the area under the standard normal curve that lies between z = -2.09 and z = 1.98. Note: the graph may not be drawn to scale.
Wednesday, October 15, 2014 by Anonymous

Statistics
The probability that a student uses the Academic Resource Center on a regular basis is 0.43 . In a group of 21 students, what is the probability that exactly 4 of them use the Academic Resource Center on a regular basis?
Wednesday, October 15, 2014 by Lexi

Basic Statistics
The Suva Energy Information Administration reported that 51.7% of homes in Sunnyville were heated by natural gas. A random sample of 200 homes found that 115 were heated by natural gas. Does the evidence supports the claim, or has the percentage changed? (Use a P-value method).
Wednesday, October 15, 2014 by Keith

Statistics
A rental agency claims that the average rent that small-business establishments pay in Suvacity is $800. A sample of 10 establishments shows an average rate of $863. The standard deviation of the sample is $20. At α = 0.05,is there enough evidence to reject the agencies ...
Wednesday, October 15, 2014 by Keith

Basic Statistics
A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050,how large a sample is needed to get the desired information and to be accurate within...
Wednesday, October 15, 2014 by John

Basic Statistics
A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per litre with a standard deviation of 2.3 kilometers per litre. (a)Assuming that the kilometers per litre given by all mid-sized cars have a normal distribution,find a 99% ...
Wednesday, October 15, 2014 by John

Statistics
The points of 100 children in a test are normally distributed with mean of 25 points and a standard deviation of 10 points. (a)Given that the passing mark is 20, estimate the number of children who passed the test. (b)If 5.59% of the children obtain a distinction by scoring x ...
Wednesday, October 15, 2014 by John

Statistics
A university sends a monthly newsletter on health to its employees. One issue included a column called "What Is the Chance?" that said: Chance that you'll die in a car accident this year: 1 in 75. There are about 310 million people in the US. About 40000 people ...
Wednesday, October 15, 2014 by Huang

Statistics
A university sends a monthly newsletter on health to its employees. One issue included a column called "What Is the Chance?" that said: Chance that you'll die in a car accident this year: 1 in 75. There are about 310 million people in the US. About 40000 people ...
Wednesday, October 15, 2014 by Huang

Pre-Cal
The prerequisite for Statistics is precalculus. College of Nursing students (only) are eligible to have the prereq waived. What does waived means?
Tuesday, October 14, 2014 by Kim

statistics
How could you reword the research hypotheses below to null hypotheses?a. Smoking during pregnancy increases the risk of a child being born prematurely.
Tuesday, October 14, 2014 by Melissa

statistics
A population has a mean of 300 and a standard deviation of 50. Suppose a sample of size 125 is selected and is used to estimate . What is the probability that the sample mean will be within +/- 3 of the population mean (to 4 decimals)?
Tuesday, October 14, 2014 by Anonymous

Statistics
4 people are chosen at random from a group of 15 people. What are the odds that all 4 people chosen were the oldest people in the group?
Monday, October 13, 2014 by Daniel

statistics
Employees at Evergreen Manufacturing company have annual salaries ranging from a low $12,500 to a high of 92,000. Assuming that you want to construct a frequency table with eight classes, find the upper and lower limits of the first class. How do I work the problem? Please?
Monday, October 13, 2014 by Charles Winslow

Statistics and Probability
Winning the jackpot in a lottery requires that you select the correct three numbers between 1 and 51 and in a another separate drawing you must select the correct single number between 1 and 15. Find the probability of winning the jackpot- The probability of winning the ...
Monday, October 13, 2014 by Macy

Statistics
Find the probability of winning a lottery with the following rule. Select the five winning numbers from 1,2...,23. (in any oder. No repeats) P(winning)= ?
Monday, October 13, 2014 by Macy

Math Statistics
Answer the following. Show your work to get credit. Exam scores are normally distributed with a mean of 81 and a standard deviation of 9. a) What is the minimum score one must have to be in the top 4% of the students taking the exam? b) What percentage of scores are below 90? ...
Monday, October 13, 2014 by JAE

statistics
Answer the following. Show your work to get credit. Exam scores are normally distributed with a mean of 81 and a standard deviation of 9. a) What is the minimum score one must have to be in the top 4% of the students taking the exam? b) What percentage of scores are below 90? ...
Monday, October 13, 2014 by JAE

Statistics
A researcher measures the following scores for a group of people. The X variable is the number of errors on a math test, and the Y variable is the person’s level of satisfaction with his/her performance. (a) With such ratio scores, what should the researcher conclude ...
Monday, October 13, 2014 by J.T

Statistics
Using a scatter diagram with x(age in weeks) of calves and y (weight in kg) and the info is as follows Week 1 /42kgs Week 3 /50 kgs Week 10/75 kgs Week 16/100kgs Week 26/150kgs week 36/200kgs would you estimate the linear correlation coefficient R to be positive , close to ...
Sunday, October 12, 2014 by Gretchen

statistics
A box contains 19 red marbles and 19 green marbles. Sampling at random from the box five times with replacement, you have drawn a red marble all five times. What is the probability of drawing a red marble the sixth time?
Sunday, October 12, 2014 by lucy

statistics
The Office of Student Services at a large western state university maintains information on the study habits of its full-time students. Their studies indicate that the mean amount of time undergraduate students study per week is 20 hours. The hours studied follows the normal ...
Sunday, October 12, 2014 by Anonymous

statistics
11. All probabilities can be expressed as decimal values ranging from 0 to 1.00.
Sunday, October 12, 2014 by Anonymous

Statistics
As part of studying the relationship between mental and physical health, you obtain the following heart rates: 73 72 67 74 78 84 79 71 76 76 79 81 75 80 78 76 78 In terms of differences in heart rates, interpret these data using the following: (a) the range, (b) the variance...
Sunday, October 12, 2014 by J.T

statistics
For the data in question 13, find the raw scores that correspond to the following: (a) z 5 11.22; (b) z 5 20.48.
Sunday, October 12, 2014 by jj

statistics
the average number of passengers on a subway car is 60. If the number of passengers on a car has normal distribution with a standard deviation of 20, approximately what the percent of subway cars carry more than 80 passengers?
Sunday, October 12, 2014 by aso

statistics
A computer is used to randomly select a number between 1 and 2000. Event A is selecting 460.
Saturday, October 11, 2014 by Anonymous

statistics
A population has m = 50. What value of s would make X = 55 a central, representative score in the population?
Saturday, October 11, 2014 by Carmen

statistics
On this semesters final exam, john scored 72 on his calculus exam and 53 on his statistics exam. The z score for both exams was the same. Which on would he do better on? a. calculus b.statistics c. the exam scores are equivalent
Saturday, October 11, 2014 by mike

statistics
suppose that the teacher of this class graded solely on a curve - 10% get A, etc. How might this effect students getting into into study groups to prepare homework or tests?
Saturday, October 11, 2014 by H

statistics
a) What is the standard deviation of the set of data? b) What raw score will have 15% of the data set above it? c) If I have a raw score of 21 what percentage of the scores, are below my score? 16, 16, 89, 76, 24, 45, 98, 20, 22, 28, 34, 35, 76, 67, 48, 37
Saturday, October 11, 2014 by anika

statistics
Using the z table what z score would cut off the upper 25% of scores.
Saturday, October 11, 2014 by angela

statistics
which of the following percentiles corresponds to the area beneath the normal curve from a z score of -1.00 to +1.00 a.98% b.34% c.68% d.100%
Friday, October 10, 2014 by Sally

statistics
On this semesters final exam, john scored 72 on his calculus exam and 53 on his statistics exam. The z score for both exams was the same. Which on would he do better on? a. calculus b.statistics c. the exam scores are equivalent
Friday, October 10, 2014 by mike

statistics
If a distribution of test scores has μ = 65 with σ = 6, and you scored at the 89th percentile, what is your score?
Friday, October 10, 2014 by kerry

statistics
I need to find the chi square distribution. Thanks During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a ...
Friday, October 10, 2014 by ANGGY

Statistics
the assets (in billions of dollars) of the four wealthiest people in a particular country are 39, 32, 11, 10. assume that samples of size n = 2 are randomly selected with replacement from this population of four values
Friday, October 10, 2014 by Jennifer

statistics
A congressional committie has of 8 senators and 7 representatives. How many ways can a subcomittie of 6 be formed from the full committee if exactly 5 of the members must be senators?
Friday, October 10, 2014 by bob

Statistics
Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,325 per hour and a standard deviation of $240. What is the operating cost for the lowest 5 percent of the airplanes?
Thursday, October 9, 2014 by Dany

statistics
I need to find the chi square distribution. Thanks During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a ...
Thursday, October 9, 2014 by ANGELA

statistics
During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following...
Thursday, October 9, 2014 by ANAHI

statistics
During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following...
Thursday, October 9, 2014 by ANAHI

statistics
if you lose 10% a year, how much will be left of 2.44 million in 26 years?
Thursday, October 9, 2014 by Josh

Statistics
During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following...
Thursday, October 9, 2014 by Vanessa

statistics; emergency please help me
During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following...
Wednesday, October 8, 2014 by ANAHI

Sociology (Statistics) Confidence Level
Help me solve this please. One of the few on my list that I had no idea how to solve. A medical researcher is interested in the prenatal care received by pregnant women in inner cities. She interviews 35 randomly selected women with children on the streets of Baltimore and ...
Wednesday, October 8, 2014 by Ryler

statistics
Please read and use the following information to answer questions 11, 12, and 13: Big packages of M&M Plain Candies have a mean weight of 16 ounces with a standard deviation of .15 ounces. A chocolate loving researcher decides to a random sample of 20 big bags of M&M Plain ...
Wednesday, October 8, 2014 by mike

statistics
Correction On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \?=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, ?=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/2.04=1.960
Wednesday, October 8, 2014 by Sally

statistics
On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \?=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, ?=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/3.57=1.120
Wednesday, October 8, 2014 by Sally

Math & Statistics
Problem 6 [Total 5 marks] The drug Ziac is used to treat hypertension. In a large clinical trial it was found that 32% of those in the placebo group experienced dizziness. (a) [1 mark] Assuming that the same 32% proportion applies to subjects taking the drug, find the ...
Wednesday, October 8, 2014 by Liz

statistics
The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 42 and a standard deviation of 10. Using the empirical rule (as ...
Wednesday, October 8, 2014 by Rose

Statistics-Help please??
Given a mean of 25 and a standard deviation of 2.3, what is the z-score of a data value of 29? I don't understand the formula they gave me for the z-score, so I dunno where to start. /:
Wednesday, October 8, 2014 by Ali

statistics
Norma finds her mean number of minutes per call to be 27, with a standard deviation of 6 minutes. The minutes per call are approximately normally distributed around 27 with no outliers.
Wednesday, October 8, 2014 by Maragret

Pyschological Statistics
In a distribution with a standard deviation of eight, an individual score of 42 corresponds to a Z score of -0.5. What is the mean of this distribution?
Wednesday, October 8, 2014 by Monique

Statistics
You own shares of Fidelity Magellan Fund (FMF), which concentrates on stocks of large American companies. Its monthly return is μFMF = 1.4% and sFMF = 4.70%. You decided to diversify your portfolio by adding shares of the Fidelity Japan Fund (FJF), which has monthly ...
Wednesday, October 8, 2014 by Ashley

Statistics
In a sophisticated medicine research center, two scales are used for repeated weighing of the same item. If the true weight of a compound is 2 grams [g], the first scale produces readings X that have a mean 2.0 g and standard deviation 0.03 g. The second scale’s readings ...
Wednesday, October 8, 2014 by Ashley

statistics
in order to estimate the mean amount of time computer users spend on the internet ea mn, how many people do i interview to have 90% confident sample mean within 11 min of the pop mean? Assum sd= 203 min
Wednesday, October 8, 2014 by heather

Statistics
On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \σ=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, σ=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/3.57=1.120
Tuesday, October 7, 2014 by Sally

statistics
Mean time 79 min Standard deviation 8 min what is the probability of doing it in 60 min or less
Tuesday, October 7, 2014 by Anonymous

statistics
On this semester’s final exam, Susie scored 72 on her classics exam (class distribution: μ = 65, σ = 3.57) and 53 on her psychology exam (class distribution: μ = 49, σ = 2.04). For which exam should Susie expect the better grade? a. Classics b. ...
Tuesday, October 7, 2014 by Sally

Statistics
A household appliance manufacturer wants to analyze the relationship between total sales and the company's three primary means of advertising (television, magazines, and radio). All values are in millions of dollars. They found the following regression equation. Sales = ...
Tuesday, October 7, 2014 by Anonymous

Statistics
`The average grade point average (GPA) of undergraduate students in New York is normally distributed with a population mean of 2.5 and a population standard deviation of 0.4. Compute the following, showing all work: 1) The percentage of students with GPA's between 2.0 and ...
Tuesday, October 7, 2014 by Charlene

statistics
Five cards are drawn from a standard deck, what is the probability of picking 3 face cards?
Monday, October 6, 2014 by luke

statistics
Five cards are drawn from a standard deck, what is the probability of picking 3 face cards?
Monday, October 6, 2014 by luke

Statistics
The average grade point average(GPA)of undergraduate students in New York is normally distributed with a population mean of and a population standard deviation of. Compute the following, 1)The percentage of students with GPA'S between 2.0 and 2.6 2)If a sample of 49 ...
Monday, October 6, 2014 by Charlene

Statistics
a laptop manufacturer finds that the average time it takes an employee to load a laptop with software is 20 minutes with a standard deviation 8 minutes. suppose you take a random sample of 81 employees. the standard deviation of the sample mean is?
Monday, October 6, 2014 by Kalyssa

Statistics
You roll two fair dice a blue one and a yellow one what is the probability of and odd on the blue die and 5 or 6 on the yellow die
Sunday, October 5, 2014 by gretchen

statistics
if you roll a single die and count the number of dots in top what is the probability of getting a number less then 3 on a single throw
Sunday, October 5, 2014 by gretchen

statistics
A poll asked 500 adults if they thought Ontario should produce more, less or maintain current production of ethanol. -160 people responded "more ethanol production" -136 people responded "less ethanol production" -155 people responded "maintain current...
Sunday, October 5, 2014 by anon

Statistics
1. If we wish to have a 95% confidence interval, what would be the value of the confidence coefficient? & Consider a sample mean (xbar) of 46 calculated from a sample of size 51 drawn from a population of over 1000.
Sunday, October 5, 2014 by Rabbitt

healthcare statistics
Transcriptionsist B is a full time employee earning10 per hour and annual sallary of 20,800 transcribes 900 lines per day for a total of 234,00 lines per year what is the unit medical transcription labor cost for transciptionist B
Sunday, October 5, 2014 by Anonymous

statistics
In a major city 7 % of cars have an alarm system installed. A car without an alarm has a probability of 0.01 of being stolen, this is triple the probability of a car with an alarm being stolen. What is the probability that a car stolen from this city has an alarm system ...
Saturday, October 4, 2014 by Joe

AP Statistics
many companies "grade on a bell curve" to compare the performance of their managers and professional workers. this forces the use of some low performance ratings, so that not all workers are listed as "above average". Ford Motor company's "...
Saturday, October 4, 2014 by AnaGloria1020

statistics
how to identify the 5 W's in the problem of the student averages in a High School college algebra class for the last semester. the teacher wanted to see how well the class did and constructed the Distribution from the grade book. who- Students what- average when last ...
Saturday, October 4, 2014 by nina

statistics
binomial probabilities one in four adults is currently on a diet. Find the probability that the number who say they are currently on a dies is (a)exactly three, (b)at least three, and (c) more than three
Thursday, October 2, 2014 by isabella

statistics
Why are unbiased estimators preferred over biased estimators?
Thursday, October 2, 2014 by Kerra

statistics
Analyze data to determine whether or not you think there is a relationship between height and ability to lift weights (at least as measured by the bench press). 1- Compute a linear regression line to fit this data, also2- compute the correlation coefficient and coefficient of ...
Thursday, October 2, 2014 by Nicole.H

statistics
c. The arrival of large jobs at a computer centre forms a Poisson process with rate 2 per hour. The service time of such jobs are exponentially distributed with mean 20 minutes. Only 4 large jobs can be accommodated in the system at a time. i. Determine the probability that a ...
Thursday, October 2, 2014 by ras

statistics
heights of men on a baseball team have a bell shaped distribution with a mean of 172 cm and a distribution of 9cm. Using the empirical rule, what is the approximate percentage of the men between the following values? a. ___% of the men are between 145cm and 199cm b.___% of the...
Thursday, October 2, 2014 by mike

Statistics
The age distribution of students at a community college is given below. Age (years) Number of students (f) 11) Over 35 26 1103 A student from the community college is selected at random. Find the conditional probability that the student is at most 35 given that he or she is at...
Wednesday, October 1, 2014 by Kelli

statistics
In frequency distribution table, I got two mode classes.then how do I calculate actual mode?
Wednesday, October 1, 2014 by Ravi kiran

Statistics
Suppose an urn contains 10 balls numbered from 1 to 10. Someone draws 3 balls simultaneously from the urn (i.e. without replacement.) What is the probability that the lowest number drawn is 2? (8C3)/(10C3) but I know that is wrong. I also tried ((8C3)+(7C3)+(6C3))/(10C3)
Tuesday, September 30, 2014 by Olivia

Statistics
Foofy obtained a significant Fobt from an experiment with five levels. She therefore concludes that changing every condition of the independent variable results in a significant change in the dependent variable. (a) Is she correct? Why or why not? (b) What must she now do?
Tuesday, September 30, 2014 by Anonymous

statistics
n order to estimate the difference between the average Miles per Gallon of two different models of cars , samples are taken and the following information is collected. Model A Model B Sample Size 13 14 Sample Mean 35 32 Sample Variance 13 7 a) Find a 95% confidence interval ...
Tuesday, September 30, 2014 by Anonymous

statistics
It is a known fact that accidents happen more often driving the car rather than flying. Jim drives 180 days and flies 120 times per year. If for every 110 days driving you get into one accident and for every 10000 flying you get into 3 accidents, what is the probability of ...
Monday, September 29, 2014 by Emelda

statistics
on a typical summers day a boat company hires rowing boats at a rate of 9 per hour. a)find the probability of hiring out at least 6 boats in a randomly selected 30 minute period. b) the company has 8 boats to hire and decides to hire them out for 20 minute periods . show that ...
Monday, September 29, 2014 by sohaila

Statistics
James has $78. He nees to buy some cds and tapes. He can buy 4 cds and 3 tapes and has $3 left or buy 3 cds and 5 tapes and has $13 left. Using system equation, find the cost of each.
Monday, September 29, 2014 by Emelda

DISCRETE MATH
How many different strings can be made from the letters in STATISTICS, using all the letters
Monday, September 29, 2014 by brenda

statistics
the average yearly utility costs on Middleton is $1722 with stdev of 146. assume that the utility costs follow a normal distribution. 1) What would the utility costs have to be so that only 7% of houses in Middleton have utility costs greater than this amount
Monday, September 29, 2014 by niki

statistics
past history indicates that an average of 1.2 calls are received per minute. What is the probability of 3 or more calls per minute
Sunday, September 28, 2014 by isaiah

statistics
The police department of a major city has found that the average height of their 1,250 officers is 71 inches (μ = 71 in.) with σ = 2.3 inches.
Sunday, September 28, 2014 by tom

statistics
c. The top 10% of the officers in terms of height also make higher salaries than the shorter officers. How tall does an officer have to be to get in that top 10% group? (I.e. what is the height marking off the top 10 percent?)
Sunday, September 28, 2014 by tom

statistics
the manager of a football team works for 310 days per year. of this he spends 42 days looking at new player he might buy. what percentage of his working days is this?
Sunday, September 28, 2014 by Anonymous

statistics
If a fair die is rolled, what is the probability of getting an even number, a number less than 5, a number larger than 6 and an odd number?
Sunday, September 28, 2014 by virginia

statistics
a test consists of 10 true or false questions followed by 10 multiple choice questions, each with 5 choices. How many ways can Faith mark her answer to this test?
Sunday, September 28, 2014 by virginia

social statistics
a smoking researcher is interested in estimating the average age when cigarette smokers first began to smoke. Taking a random sample of 25, she determines a sample mean of 16.8 years and a sample deviation of 1.5 years. Construct a 95% confidence interval to estimate the ...
Saturday, September 27, 2014 by Kenya

Statistics
X is a normally distributed random variable X with mean 15 and standard deviation 0.25. Find the values xL and xR of X that are symmetrically located with respect to the mean of X and satisfy P(xL < X < xR) = 0.80. (Hint. First solve the corresponding problem for Z.)
Saturday, September 27, 2014 by Anonymous

statistics
According to U.S. News & World Report data, in 1995 tuition costs at Indiana University, a public university, were $2,984 per year, while the tuition costs at the University of Evansville, a private university in Indiana, were $11,800 per year. In that same year the average ...
Saturday, September 27, 2014 by mike

statistics
Slf-Esteem Scoresdepression Scores Mean 3.43 15.78 StrdDev 0.75 10.34 The above chart contains the means and standard deviations for self-esteem scores and depression scores. Using this information and the most likely correlation coefficient obtained in Question 12 (-.76), ...
Friday, September 26, 2014 by mike

statistics
A nutritionist was interested in determining the smoking status of her clients. She asked each of her clients to report his or her current smoking status: Smoker, Ex-Smoker, and Non-Smoker. Which of the following graphical techniques is the best way for her to represent the ...
Friday, September 26, 2014 by mike

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>

Homework Help: Math

Members