Friday

October 21, 2016
**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 receives 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*

**statistics**

The 92 million Americans of age 50 and over control 50% of all discretionary income (AARP Bulletin, March 2008). AARP estimated that the average annual expenditure on restaurants and carry out food was $1873 for individuals in this age group. Suppose this estimate is based on ...

*Friday, September 26, 2014 by ashley*

**statistics**

In a school election, 5 people run for student body president. The actual number of votes for each candidate would be a ___ variable. If the total number of votes were removed and the candidates were listed in order of least to most popular, this would be a __ variable. a. ...

*Thursday, September 25, 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 ...

*Thursday, September 25, 2014 by shelly*

**statistics**

Slf-Esteem Scoresdepression Scores Mean 3.43 15.78 StrdDev 0.75 10.34 13. 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...

*Thursday, September 25, 2014 by matt*

**statistics**

In a school election, 5 people run for student body president. The actual number of votes for each candidate would be a ___ variable. If the total number of votes were removed and the candidates were listed in order of least to most popular, this would be a __ variable. a. ...

*Thursday, September 25, 2014 by shelly*

**Statistics**

An ESP experiment is conducted by a psychologist. For part of the experiment, the psychologist takes 10 cards numbered 1-10 and shuffles them. Then she looks at the cards one at a time. While she looks at each card, the subject writes down the number he thinks is on the card. ...

*Wednesday, September 24, 2014 by <3*

**statistics 1**

A study found that, in 2005, 12.5% of U.S. workers belonged to unions (The Wall Street Journal, January 21, 2006). Suppose a sample of 400 U.S. workers is collected in 2006 to determine whether union efforts to organize have increased union membership. Formulate the hypotheses...

*Wednesday, September 24, 2014 by Vanessa*

**statistics 2**

In Hamilton County, Ohio the mean number of days needed to sell a home is 86 days (Cincinnati Multiple Listing Service, April, 2012). Data for the sale of 40 homes in a nearby county showed a sample mean of 80 days with a sample standard deviation of 20 days. Conduct a ...

*Wednesday, September 24, 2014 by Vanessa*

**statistics 3**

An airline promotion to business travelers is based on the assumption that no more than two-thirds of business travelers use a laptop computer on overnight business trips. 1. What is the sample proportion from an American Express-sponsored survey that found 365 of 543 business...

*Wednesday, September 24, 2014 by Vanessa*

**statistics 7**

Home values tend to increase over time under normal conditions, but the recession of 2008 and 2009 has reportedly caused the sales price of existing homes to fall nationwide (BusinessWeek, March 9, 2009). You would like to see if the data support this conclusion. The file ...

*Wednesday, September 24, 2014 by Vanessa*

**statistics**

The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in Northern Kentucky use this price as a population mean population standard deviation is $.20. question. what is the probability that the mean price for a sample of 30 station is good then $....

*Wednesday, September 24, 2014 by thickhoneybrown*

**Statistics 7**

Home values tend to increase over time under normal conditions, but the recession of 2008 and 2009 has reportedly caused the sales price of existing homes to fall nationwide (BusinessWeek, March 9, 2009). You would like to see if the data support this conclusion. The file ...

*Wednesday, September 24, 2014 by Vanessa*

**Statistics 3**

An airline promotion to business travelers is based on the assumption that no more than two-thirds of business travelers use a laptop computer on overnight business trips. 1. What is the sample proportion from an American Express-sponsored survey that found 365 of 543 ...

*Wednesday, September 24, 2014 by Vanessa*

**Statistics 2**

In Hamilton County, Ohio the mean number of days needed to sell a home is 86 days (Cincinnati Multiple Listing Service, April, 2012). Data for the sale of 40 homes in a nearby county showed a sample mean of 80 days with a sample standard deviation of 20 days. Conduct a ...

*Wednesday, September 24, 2014 by Vanessa*

**Statistics 1**

A study found that, in 2005, 12.5% of U.S. workers belonged to unions (The Wall Street Journal, January 21, 2006). Suppose a sample of 400 U.S. workers is collected in 2006 to determine whether union efforts to organize have increased union membership. Formulate the hypotheses...

*Wednesday, September 24, 2014 by Vanessa*

**statistics 7**

Home values tend to increase over time under normal conditions, but the recession of 2008 and 2009 has reportedly caused the sales price of existing homes to fall nationwide (BusinessWeek, March 9, 2009). You would like to see if the data support this conclusion. The file ...

*Tuesday, September 23, 2014 by MIA*

**statistics 3**

An airline promotion to business travelers is based on the assumption that no more than two-thirds of business travelers use a laptop computer on overnight business trips. 1. What is the sample proportion from an American Express-sponsored survey that found 365 of 543 business...

*Tuesday, September 23, 2014 by MIA*

**statistics 2**

In Hamilton County, Ohio the mean number of days needed to sell a home is 86 days (Cincinnati Multiple Listing Service, April, 2012). Data for the sale of 40 homes in a nearby county showed a sample mean of 80 days with a sample standard deviation of 20 days. Conduct a ...

*Tuesday, September 23, 2014 by MIA*

**statistics 1**

A study found that, in 2005, 12.5% of U.S. workers belonged to unions (The Wall Street Journal, January 21, 2006). Suppose a sample of 400 U.S. workers is collected in 2006 to determine whether union efforts to organize have increased union membership. Formulate the hypotheses...

*Tuesday, September 23, 2014 by MIA*

**math statistics**

A group of teenager smoking rate dropped 8.5% in 2007 from 17.6% in 2001 and 23% in 1997. 1. Calculate the probability that at least one in a group of 10 teenagers smoked in 2007.2. Calculate the probability that at least one in a group of 10 teenagers smoked in 2001. 1. ...

*Tuesday, September 23, 2014 by rachel*

**statistics 7**

Home values tend to increase over time under normal conditions, but the recession of 2008 and 2009 has reportedly caused the sales price of existing homes to fall nationwide (BusinessWeek, March 9, 2009). You would like to see if the data support this conclusion. The file ...

*Tuesday, September 23, 2014 by ANAHI*

**statistics 3**

An airline promotion to business travelers is based on the assumption that no more than two-thirds of business travelers use a laptop computer on overnight business trips. 1. What is the sample proportion from an American Express-sponsored survey that found 365 of 543 business...

*Tuesday, September 23, 2014 by ANAHI*

**statistics 2**

In Hamilton County, Ohio the mean number of days needed to sell a home is 86 days (Cincinnati Multiple Listing Service, April, 2012). Data for the sale of 40 homes in a nearby county showed a sample mean of 80 days with a sample standard deviation of 20 days. Conduct a ...

*Tuesday, September 23, 2014 by ANAHI*

**statistics 1**

A study found that, in 2005, 12.5% of U.S. workers belonged to unions (The Wall Street Journal, January 21, 2006). Suppose a sample of 400 U.S. workers is collected in 2006 to determine whether union efforts to organize have increased union membership. Formulate the hypotheses...

*Tuesday, September 23, 2014 by ANAHI*

**statistics**

Teenage smoking rate dropped to 8.5% in 2007 from 17.6% in 2001 and 23% in 1997. 1. Calculate the probability that at least one in a group of 10 teenagers smoked in 2007. 2. Calculate the probability that at least one in a group of 10 teenagers smoked in 2001. 3. Calculate the...

*Tuesday, September 23, 2014 by rachel*

**Statistics**

The following data set is the GPAs of the students in a statistics class. 1.93, 1.99, 2.00, 2.04, 2.12, 2.34, 2.55, 2.55, 2.75, 2.75, 2.80, 2.80, 2.85, 3.02, 3.12, 3.22, 3.31, 3.33, 3.45, 3.69 What percentile is a GPA of 2.34? A. About the 6th B. About the 15th C. About the ...

*Tuesday, September 23, 2014 by Amy*

**statistics**

The mean grade in this class last semester was 78.3, and the variance was 34.6 . The distribution of grades was unimodal and symmetrical.. determine how many students are likely to fail the class (<60), and how many students are likely to get a “A” (>90), if ...

*Tuesday, September 23, 2014 by Nicole.H*