Sunday

February 1, 2015

February 1, 2015

Number of results: 1,100

**stats (please help)**

Assume that the population of heights of male college students is approximately normally distributed with mean of 69 inches and standard deviation of 3.75 inches. Show all work. (A) Find the proportion of male college students whose height is greater than 70 ...
*July 21, 2011 by Celest*

**Stats**

Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† Suppose a small group of 17 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous studies, we can assume that the weights...
*March 16, 2014 by Alexus*

**Stats**

6. In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Rainfall; Crop yield II. Taxi fare; Length of ...
*October 18, 2011 by Jen*

**stats**

Using the 68-95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: Suggest you make a drawing and label first… a. Percentage of scores less than 100 b...
*September 20, 2010 by Jenn*

**stats**

A manufacturing process has 100 customer orders to fill. Each order requires one component part that is purchased from a supplier. However, typically, 2% of the components are identified as defective, and the components can be assumed to be independent. a. If the manufacturer ...
*October 9, 2012 by Anonymous*

**Can somehelp me with this ASAP plz?!?!?! Stats**

For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51 Mean = 72 Median = 72 Mode = 98 Midrange = 57 I. What score was earned by more students than any other ...
*October 19, 2011 by Jen*

**stats help!**

suppose the number of customer complaints per day on the morning shift (6am-12) at Murph's Coffee is distributed as follows: Complaints f(x) 0 .3 1 ??? 2 .2 a) what is the value of ??? b)what is the average number of complaints per day on the morning shift? c)what is the ...
*January 13, 2011 by Sam*

**Stats **

I need help with this problem for school. For the first one i got .3758 and second 1.6, but i don't think they are right. My calculations are off It is known that about 20% of car insurance policies include emergency road service. Suppose we randomly select 10 car insurance ...
*February 15, 2011 by John*

**Stats**

An article (N. Hellmich. "'Supermarket Guru' Has a Simple Mantra,” USA Today, June 19, 2002, p. 70) claimed that the typical super market trip takes a mean of 22 minutes. Suppose that in an effort to test this claim, you select a sample of 50 shoppers at a local supermarket. ...
*August 13, 2008 by Student*

**Econ/stats**

The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line indicates. b. Compute ...
*April 29, 2012 by Ruth*

**Econ/stats**

The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line indicates. b. Compute ...
*April 29, 2012 by Ruth*

**Stats**

For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51 Mean = 72 Median = 72 Mode = 98 Midrange = 57 Answer each of the following: I. What score was earned by ...
*October 17, 2011 by Jen*

**bus. /stats**

Use the data given in the table to construct a frequency distribution and ogive? Before constructing a dam on a Hill river, the Army corps of engineers performed a series of tests to measure the water flow past the proposed location of the dam. The results of the testing were ...
*September 3, 2011 by tim*

**Stats**

A study of the students taking distance learning courses at a university finds that they are mostly older students not living in the university town. Choose a distance learning student at random. Let A be the event that the student is 25 years old or older and B the event ...
*April 10, 2012 by Anonymous*

**Stats Math 2**

Exit polling is a popular technique used to determine the outcome of an election prior to results being tallied. Suppose a referendum to increase funding for education is on a ballot in a large town (voting population over 100,000). An exit poll of 300 voters finds that 144 ...
*November 26, 2014 by LADO*

**Stats (Chi-Square)**

Suppose you have a chi-squars GOF test to test null hypothesis that the age distribution of drivers stopped in 2003 for traffic violations is the same as the age distr. in 2002. You compute chi-square= 14.7. At the 5% significance level, what is an appropriate conclusion? A p-...
*March 3, 2011 by Graciela*

**stats**

which test to use One-sample or independent samples t-test? A researcher tests five individuals who have seen paid political ads about a particular issue. These individuals take a multiple-choice test about the issue in which people in general (who know nothing about the issue...
*March 5, 2013 by kelly*

**Stats**

Two dice are tossed. What is the probability that the sum of both dice is a prime number? this is the answer i have ; Presuming two fair, 6-sided dice, each numbered 1 through 6: You can achieve one of the following results on any given roll: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12...
*July 1, 2013 by Megan*

**stats**

A company with a large fleet of cars found that the emissions systems of 18 out of the 65 randomly selected cars they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance? Test the appropriate ...
*May 11, 2011 by Erica*

**Statistics**

I am doing a stats study and im stuck on what test to perform. Please look at my subject and advise me.. I am testing to see whether a person that is best in math and science will be able remember more numbers than letters and if a person that is better in language and history...
*March 21, 2011 by jason*

**Stats**

A public heath official wanted to know how often university students visit their student health centers due to illness or injury. The official took a nationwide random sample of 120 university students and found an average of (x bar) = 2.30 visits per student per year. It is ...
*April 25, 2012 by Cat*

**stats**

This week we practice with Binomial Distribution. You can use Appendix Table E or Excel Function Binomdist. About 30% of adults in United States have college degree. (probability that person has college degree is p = 0.30). If N adults are randomly selected, find probabilities...
*November 10, 2011 by mary*

**stats**

To estimate the mean score of those who took the Medical College Admission Test on your campus, you will obtain the scores of an SRS of students. From published information you know that the scores are approximately Normal with standard deviation about 6.4. You want your ...
*November 6, 2013 by Aman*

**Stats**

The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience. Admissions Probability 1,080 0.5 1,340 0.2 1,660 0.3...
*September 28, 2010 by Nicole *

**STATS HELP**

Freshman-sophomore retention rate (FSRR) for a college is the proportion of first-year students who return to the college for their sophomore year. Nationwide, the mean FSRR for colleges in the U.S. is 75%. Use the 68-95-99.7 rule to describe graphically the sampling ...
*November 1, 2009 by Chelsea*

**stats**

Time taken in mins for student to walk to school. 1-5 mins (4 students) 6-10 mins (7 students) 11-15 mins (10 students) 16-20 mins (20 students) 21-25 mins (6 students) 26-30 mins (3 students) 1)Estimate the probability that a student selected at random will take at least 21 ...
*September 26, 2008 by Keisha*

**Stats**

A roulett wheel has 38 slots in which a ball can land two of e slots are green, 18 are red, 18 are black. The ball is equally likely to land in any slot, and each spin of the wheel is assumed to be independent. A)if the wheel is spun twice what is the probability that the ball...
*March 10, 2013 by Salina *

**stats again**

ok I get it, so once I get the prob figred for one person, how do I figure it if additional attempts are made and the question is about the prob of at least one of the additional attempts say n = 6 getting the same results as the first Once you have the probability of passing ...
*July 5, 2007 by holly*

**Stats**

Recently, a price war has developed among retailers selling Brand X denim jeans. A major chain buyer wishes to estimate the mean price of these jeans during this period to compare it to the normal selling price of $20.00. A random sample of 7 major retailers produces a mean ...
*November 16, 2012 by Mike*

**Stats...is this correct?**

A sample of purchases at the local convenience store has resulted in the following sample data, where x = the number of items purchased per customer and f = the number of customers. x 1 2 3 4 5 f 5 15 8 8 7 1. What does the 15 stand for in the above table? 2. Find the midrange...
*October 18, 2011 by Jen*

**Psychology/Statistics**

I have a quick question for you all. I have done a repeated measures ANOVA for hypothetical data in my Stats class. There were 5 subjects.. all subjects rated their mood on a cloudy day, then they all rated their mood on a sunny day. In sum.. they all underwent the same order ...
*November 8, 2006 by Melissa*

**Stats- NEED HELP**

According to the Census Bureau publication Current Population Reports, the probability distribution for household size (number of people per household, say X) in the United States is as follows. For the purpose of the next two questions, the experiment consists of randomly ...
*February 7, 2011 by Ryan*

**Sociology (stats) help**

Given the mean = $12 Standard deviation = $2.50 Suppose that a large state university graduate research assistants are paid by the hour. Data from the personnel office show the distribution of hourly wages paid to graduate students across the campus is approximately normal ...
*October 8, 2014 by Ronald*

**Stats**

The probability that a person has blue eyes is 16%. Three unrelated people are selected at random. a. Find the probability that all three have blue eyes: b. Find the probability that none of the three have blue eyes c. Find the probability that one of the three has blue eyes
*April 30, 2013 by Dave*

**bus stats**

John parks cars at a hotel. On the average, 6.0 cars will arrive in an hour. A driver's decision on whether to let John park the car does not depend upon any other person's decision. Define the random variable X to be the number of cars arriving in any hour period. a. Wat is ...
*March 25, 2011 by Mich Mich*

**Stats**

A random sample obtained from a population has a mean of µ=100 and a standard deviation of ó = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n = 100 is 2 ...
*November 11, 2014 by Michelle*

**Math-Stats**

An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula. The researchers use videotape to count how many cockroaches are still alive, and how many appear to be in distress, at 10 second intervals. When the ...
*October 10, 2011 by Jen*

**stats**

If 95% of all people between 21 and 50 have had at least one adult beverage in their life, find these probabilities for a sample of 10 people in that age group: a) Exactly 10 have had an adult beverage b) At least 6 have had an adult beverage c) At most 8 have had an adult ...
*August 4, 2012 by AMber*

**stats**

Consider an infinite population with 25% of the elements having the value 1, 25% the value 2, 25% the value 3, and 25% the value 4. If X is the value of a randomly selected item, then X is a discrete random variable whose possible values are 1, 2, 3, and 4. (a) Find the ...
*November 5, 2008 by Mischa*

**stats...please help, I don't really understand**

A college professor decides to run for Congress in a district with 450,000 registered voters. In a survey she commissioned, 58% of the 4000 registered voters interviewed indicated that they plan to vote for her. The population of interest is the: A. 450,000 registered voters ...
*January 31, 2009 by brian*

**stats**

A study by Hewitt Associates showed that 79% of companies offer employees flexible scheduling. Suppose a researcher believes that in accounting firms this figure is lower. The researcher randomly selects 415 accounting firms and through interviews determines that 303 of these ...
*March 24, 2013 by John Barclaey*

**Stats**

3. Suppose you work for the Ford Motor Company and must establish regulations concerning the maximum number of people who can ride in a minivan. Ford tells you that the total number of people in a minivan follows a normal distribution with a mean of 6 and a standard deviation ...
*August 4, 2012 by AMbe*

**stats**

slot machines are now video games, with outcomes determined by random number generations. in the old days, slot machines were like this: you pull the lever to spin 3 wheels; each wheel has 20 symbols, all equally likely to show when the wheel stops spinning; the three wheels ...
*March 23, 2010 by steven*

**Stats**

Consider the Avionic Manufacturing Company that wishes to meet a demand of 10 units per month by purchasing the items from a vendor with a lead time of three-quarters of a month. The item cost is $2.50 per unit, replenishment cost is $3.50 per order, and the holding cost is $0...
*October 29, 2011 by Toby*

**prob and stats**

–/3 points Notes Question: TanColM7 8.6.003. TKK Products manufactures electric light bulbs in the 50-, 60-, 75-, and 100-watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 774 hr and standard deviation of 68 hr. Find ...
*October 15, 2010 by br0Ok3*

**Stats**

In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Rainfall; Crop yield II. Taxi fare; Length of ride ...
*October 19, 2011 by Jen*

**Stats( PLEASE HELP)**

A psychologist has constructed a paper and pencil test purported to measure depression. To see how the test compares with the ratings of the expert, 12 emotionally disturbed individual are given the paper and pencil test. The individuals are also independently rank-ordered by ...
*April 2, 2009 by Lou*

** stats**

Hello, I need help determining what x and y are in this question.inoder to answer this question:What is the correlation between the rankings of the two psychiatrists? A psychologist has constructed a paper and pencil test purported to measure depression. To see how the test ...
*April 1, 2009 by Lou*

**Stats**

Hello, I need help determining what x and y are in this question.inoder to answer this question:What is the correlation between the rankings of the two psychiatrists? A psychologist has constructed a paper and pencil test purported to measure depression. To see how the test ...
*April 1, 2009 by Lou*

**ap stats-- probability**

over a 5 year period of time, 80% of winter days in Philadelphia had an average temperature above freezing. 20% of those days had precipitation. Of the days with an average temperature below freezing, 15% had precipitation. A winter day is chosen at random. Find the ...
*October 24, 2012 by zack*

**Stats Class**

Passengers using New York's MetroCard system must swipe the card at a rate between 10 and 40 inches per second, or else the card must be re-swiped through the card reader. Research shows that actual swipe rate by subway riders are uniformly distributed between 5 and 50 inches ...
*April 11, 2014 by Amanda *

**Stats**

In a study of children with a particular disorder, parents were asked to rate their child on a variety of items related to how well their child performs different tasks. One item was "Has difficulty organizing work," rated on a five-point scale of 0 to 4 with 0 corresponding ...
*July 9, 2012 by James*

**prob and stats**

A test is conducted in 22 cities to see if giving away free transit system maps will increase the number of bus riders. In a regression analysis, the dependent variable Y is the increase in bus riders (in thousands of persons) from the start of the test until its conclusion. ...
*December 9, 2009 by please help!*

**Stats**

On her first test in algebra, Mary earned a score of 75, and she made an 85 on her first psychology test. If the average score on the algebra test was a 68, with s=7, and the average on the psychology test was 91, with s=6, is Mary doing better in psychology or algebra. Why?
*October 4, 2012 by Amber*

**stats**

Education 25 t0 34 35 t0 54 55+ Total Did not complete high school 4,474 9,155 14,224 27,853 Completed high school 11,546 26,481 20,060 58,087 1-3 years of college 10,700 22,618 11,127 44,445 4 or more years of college 11,066 23,183 10,596 44,845 Total 37,786 81,435 56,008 175...
*February 6, 2009 by Anonymous*

**stats: need help please**

4.34 Keno is a favorite game in casinos, and similar games are popular with the states that operate lotteries. Balls numbered 1 to 80 are tumbled in a machine as the bets are placed, then 20 of the balls are chosen at random. Players select numbers by marking a card. The ...
*December 7, 2008 by Stephanie*

**Statistics PLEASE HELP FINAL IN 1 HOUR**

Is a new hair shampoo product actually effective? Ask participants to grade themselves on scale of 1-10 how attractive their hair is both before and after using a shampoo product after 2 weeks Results Subject Initial Rating (A) Rating After 2 Weeks (B) 1 1 5 2 2 3 3 5 5 4 3 7 ...
*March 19, 2014 by UCI STUDENT *

**Stats**

[1%] CHI SQUARE TEST OF INDEPENDENCE: Of a sample of 80 single and married women surveyed, we obtained the following data as to the sizes of cars each one owns (assuming 1 car per person). Test whether car size is independent of marital status at the .01 significance level. ...
*May 17, 2010 by TJohnson*

**Biology**

The article is presented by HomeworkEasy experts out of five years of stead fast dedication to help students with their biology assignments, homework and projects. Origins of biology as a field are expounded and the academic possibilities are briefed. The spicy narration oh ...
*July 11, 2011 by Daniel*

**Stats help**

Which test should be used one samples t test, independent samples t test or dependent samples t test. What do you set the hypothesis as Five people who were convicted of speeding were ordered by the court to attend a workshop. A special device put into their cars kept records ...
*March 13, 2013 by Anonymous*

**Stats**

If there are only two possible outcomes to an experiment then... A.) the two corresponding probabilities must each be.50. B.) the two corresponding probabilities could be any numbers between 0 and 1, but must add up to 1. C.) the two corresponding probabilities could each be ...
*November 2, 2011 by Mandy*

**stats**

A survey was done recently by the Royal Bank with Ipsos Reid (reported in Globe and Mail Aug 16 2010) about financial issues that university students face. (Data used here is based on that survey, but randomized to be still within the margin of error of that survey.) The ...
*October 2, 2010 by jaz*

**Stats**

It is known that the amount of time needed to change the oil in a car is normally distributed with a standard deviation of 5 minutes. A random sample of 100 oil changes yielded a sample mean of 22 minutes. Compute the 99% confidence interval estimate of the mean of the ...
*February 26, 2007 by Jason L*

**Stats**

You are allowed to choose four whole numbers from 1 to 10 (including 1 and 10). You can only choose each number once though. Which of the following statements is FALSE? A. The numbers 4, 5, 6, and 7 have the smallest possible standard deviation. B. The numbers 1, 2, 3, and 4 ...
*January 20, 2012 by Nikki*

**Stats**

Observations are taken on sales of a certain mountain bike in 30 sporting goods stores. The regression model was Y = total sales (thousands of dollars), X1 = display floor space (square meters), X2 = competitors’ advertising expenditures (thousands of dollars), X3 = advertised...
*September 30, 2010 by Mat*

**Stats**

A test of hypothesis is performed to determine whether the proportion of Montrealers (population 1) who want the decriminalization of marijuana is greater than the proportion of Torontonians (population 2) who want decriminalization of marijuana. A random sample of 120 ...
*November 17, 2013 by Emile*

**stats**

Suppose we have a population of scores with a mean (μ) of 200 and a standard deviation (σ) of 10. Assume that the distribution is normal. Provide answers to the following questions: What score would cut off the top 5 percent of scores? What score would cut off the ...
*October 30, 2011 by lori*

**Elasticity**

Hi guys, could you please help me with this question; What reason would firms wish to have knowledge in regards to the income elasticity of demand for its products??? Is it because it allows them to see what happens to their total revenue as price changes????? Since this is ...
*September 28, 2006 by Sarah*

**stats**

You are determining the period of oscillation of a pendulum. One procedure would be to measure the time for 20 oscillations, t20, and repeat the measurement 5 times. Another procedure would be to measure the time for 5 oscillations, t5, and repeat the measurement 20 times. ...
*October 19, 2008 by Sam*

**stats**

Suppose that the average amount paid by customers at a grocery store is $80. The standard deviation of the amounts paid is $24. The distribution of the amounts paid is skewed. (Notice that the individuals here are customers and the variable is the amount paid per customer.) ...
*October 5, 2014 by Ujash*

**stats**

An analysis is done to determine the amount spent on fresh fruits and vegetables per person per week. In a certain area, assume this amount is normally distributed with a mean of $13.9 and a standard deviation of $ 4.91. A. When finding the probability that a random person ...
*October 10, 2010 by ff*

**Stats**

In a study that was highly published doctors discovered that aspirin helps prevent heart attacks. The research project which was scheduled to last 5 years employed 22,000 american physicians (all male). Half took an aspirin tablet 3 times a week while the other half took a ...
*February 27, 2007 by kristen*

**Stats **

Directions: Suppose you have a standard deck 52 cards (4 suits: hearts, diamonds, clubs, and spades each suit has 13 cards (1/4 of the deck) and those 13 cards include one ace,and numbers 2 through 10 and 3 face cards: a jack a queen and king) suppose you pick a card at ...
*March 10, 2013 by Sarah*

**stats**

Nicotine (mg) Filtered Kings Nonfiltered Kings n1 = 21 n2 = 8 sample mean = 0.94 sample mean = 1.65 s = 0.31 s = 0.16 Suppose you were to conduct a test (at the 0.05 significance level) to test the claim that king-size cigarettes with filters have a lower mean amount of ...
*August 12, 2008 by nick*

**stats**

The probability that an individual has hearing loss is .40. The probability that an individual has poor eyesight is .55. If hearing loss and poor eyesight are INDEPENDENT events, what is the probability of a person with hearing loss and poor eyesight?
*November 17, 2013 by lono*

**bus stats**

A manufacturing company has 5 identical machines that produce nails. The probability that a machine will break down on any given day is .1. Define a random variable X to be the number of machines that will break down in a day. a. what is the appropriate probability ...
*March 25, 2011 by Mich Mich*

**Stats**

In one study of smokers who tried to quit smoking with nicotine patch therapy, 36 were smoking after one year after the treatment, and 34 were not smoking one year after the treatment. Use a 0.10 significance level to test the claim that among smokers who try to quit with ...
*November 26, 2012 by Shannon*

**stats**

Weights of parts are normally distributed with varianceσ2. measurement error is normally distributedwith mean zero and variance 0.5σ2, independent ofthe part weights, and adds to the part weight. Upper andlower specifications are centered at 3σ about the ...
*November 14, 2014 by sam*

**Stats**

G. Johnson recently inherited a large sum o money; he wants to use a portion of this money to set up a trust fund for his two children. The trust fund has two investment options: 1) a bond fund and 2) a stock fund. The projected returns over the life of the investments are 6% ...
*July 10, 2008 by Judy*

**Stats**

A statistical test is performed, and its P-value turns out to be about 3%. Which of the following must be true? Pick all that are correct. a) The null hypothesis is true. b)There is about a 3% chance that the null hypothesis is true. c) The alternative hypothesis is true. d) ...
*August 3, 2013 by Helen*

**stats**

use dependent samples t test. Set hypothesis so what formula will I use to solve Five people who were convicted of speeding were ordered by the court to attend a workshop. A special device put into their cars kept records of their speeds for two weeks before and after the ...
*March 13, 2013 by Anonymous*

**stats**

You are a share analyst for an investment firm and are investigating the return on shares in the Eastern Mining Corporation over the last four years. The return on Eastern Mining Corporation shares over the last four years is presented. Calculate the geometric mean rate of ...
*October 1, 2010 by Answer Me*

**Stats - Post Hoc Analysis**

This is a question I am working on. i have successfully figured out part A and am having trouble with part B. (My work for Part B is shown below) ______________________________________ Two new therapies designed to increase levels of self-esteem are tested in a clinical ...
*June 17, 2006 by VC15*

**AP Stats**

Maria and Zoe are taking Biology 105 but are in different classes. Maria's class has an average of 78% with a standard deviation of 5% on the midterm, whereas Zoe's class has an average of 83% with a standard deviation of 12%. Assume that scores in both classes follow a normal...
*January 9, 2009 by Peter*

**college stats**

A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows: Student Anxiety Scores Study Hours 5 1 10 6 5 2 11 8 12 5 4 1 3 4 2 6 6 5 1 2 Why is a correlation the most appropriate statistic? What is the...
*October 8, 2012 by brittany *

**stats**

It was thought that students who dressed more neatly received better grades. To test this idea, a researcher rated each student on neatness of dress and obtained their grades on a standard school achievement test. The data are presented below. Higher scores indicate higher ...
*May 8, 2013 by Anonymous*

**stats**

18. Numerous studies have found that males report higher self-esteem than females, especially for adolescents (Kling, Hyde, Showers, & Buswell, 1999). Typical results show a mean self-esteem score of M = 39.0 with SS = 60.2 for a sample of n =10 male adolescents and a mean of ...
*October 7, 2014 by Anonymous*

**Stats**

A few years ago, researchers investigated how many clubs students were involved in at a small liberal arts college in the Northeast. The results of their interviews of 92 students are tabulated below: number of clubs students 0 18 1 12 2 15 3 16 4 17 5 9 6 3 7 0 8 0 9 2 a. ...
*September 22, 2009 by CM*

**Prob and Stats**

To estimate the mean height population of male students on your campus, you will measure and SRS of students. Heights of people the same sex and similiar ages are close to normal. You know from government data that the standard deviation of the heights of young men is about 2....
*October 12, 2010 by Susan*

**Stats**

When asked about their driving, 56% of students say they are better than the average driver, 39% say they are an ave. driver and the rest say they are worse than ave. A pair of students are driving home together for break. What is the probability that at least one student said...
*October 14, 2009 by CM*

**STATS**

In a certain store, there is a .05 probability that the scanned price in the bar code scanner will not match the advertised price. The cashier scans 820 items. a) What is the expected number of mismatches and standard deviation? (Round your expected number of mismatches to 1 ...
*October 30, 2010 by Helen*

**stats**

a student randomly guesses at five multiple-choice questions, each question has five possible choices (suppose the choice for each question is independent): a) Find the probability that the student gets exactly three correct. b) What is the probability that the student gets ...
*March 31, 2012 by jeanette*

**stats**

Often the percent of an animal species in the wild that survive to breed again is lower following a successful breeding season. This is part of nature‘s self- regulation, tending to keep population stable. A study of merlins (small falcons) in northern Sweden observed the ...
*February 5, 2009 by kate*

**stats**

Often the percent of an animal species in the wild that survive to breed again is lower following a successful breeding season. This is part of nature‘s self- regulation, tending to keep population stable. A study of merlins (small falcons) in northern Sweden observed the ...
*February 5, 2009 by kate*

**stats**

Often the percent of an animal species in the wild that survive to breed again is lower following a successful breeding season. This is part of nature‘s self- regulation, tending to keep population stable. A study of merlins (small falcons) in northern Sweden observed the ...
*February 6, 2009 by peter*

**Stats**

In the past, the mean running time for a certain type of flashlight battery has been 9.8 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The ...
*November 22, 2014 by Amy*

**stats**

Identify the direction and all possible interpretations of each of the following correlations. Be sure to identify each example as positive, negative, or zero (not correlated). Then give all possible causal interpretations for the results. Many students in Professor Handel’s ...
*April 28, 2013 by Anonymous*

**STATS**

Archaeologists often find only parts of ancient human remains. For example, they may find a small finger bone, called the metacarpal bone. Is it possible to predict the height of a human from the length of his or her metacarpal bone? To investigate, a researcher measures the ...
*February 20, 2014 by Tracy *

**Stats**

Mark and job are basketball players and will play a game. In the game, Mark will get 2 free throw attempts and John will get three. Overall, Mark makes a basket on 90% of free throw attempts and John makes it 50% of the time. Mark will win the game if he makes more free throws...
*October 19, 2014 by Sarah*

**Stats**

Rising prescription drug prices caused the U.S. Congress to consider laws that would force pharmaceutical companies to offer prescription discounts to senior citizens without drug benefits. The House Government Reform Committee provided data on the prescription cost of some of...
*November 25, 2009 by Desire*

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