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August 29, 2014

August 29, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**Statistics**

How do I figure out the answer to this ? It's been a while since I came across one like it; On a test, 6.25% of the questions are answered incorrectly. If 5 questions are answered incorrectly, how many questions are on the test ?
*Saturday, May 25, 2013 at 1:04pm*

**statistics**

Help!!I have tried this several times and come up with wrong answer. WHAT PERCENTAGE OF A NORMAL DISTIBUTION IS GREATER THAN THE MEAN? (GIVE ANSWER TO NEAREST PERCENT)THIS ONE I GOT 68% AND IT WRONG... AND WHAT PERCENTAGE IS GREATER THAN A VALUE THAT IS 1 STANDARD DEVIATION ...
*Saturday, May 25, 2013 at 1:01pm*

**Statistics**

How do you fine the P-value?
*Saturday, May 25, 2013 at 12:01pm*

**healthcare**

Identify and discuss at least 2 specific sources of health care statistics. These sources can be examples of either primary or secondary data sources.
*Saturday, May 25, 2013 at 8:29am*

**statistics**

This question was previous answered and when I put the answer in it was wrong. I have tried to work out more like it and if that one is not right, what is wrong with it. A study was conducted to investigate the relationship between the cost, y (in tens of thousands of dollars...
*Friday, May 24, 2013 at 7:06pm*

**Statistics**

Suppose the variable x is the number of minutes walked each week and the variable y is the blood cholesterol level given by the following table: x y 31 290 60 278 90 259 120 238 150 219 Using the regression equation, predict cholesterol levels when walking is 175 minutes per ...
*Friday, May 24, 2013 at 6:58pm*

**statistics**

Can someone please tell me how I miss this, I added them up 29 and divided by 8 and came up with 3.625. Below is the question. Please don't send me to other sites and just explain why it is wrong. The number of children, x, belonging to each of eight families registering ...
*Friday, May 24, 2013 at 6:38pm*

**statistics**

would someone please work this problem out in steps so I can understand it. book not helping confusing me more. A study was conducted to investigate the relationship between the cost, y (in tens of thousands of dollars), per unit of equipment manufactured and the number of ...
*Friday, May 24, 2013 at 10:47am*

**healthcare**

•Identify and discuss at least 2 specific sources of health care statistics
*Friday, May 24, 2013 at 7:26am*

**statistics.urgent please help..**

A local college cafeteria has a self-service soft ice-cream machine. The cafeteria provides bowls that can hold up to 16 ounces of ice-cream. The food service manager is interested in comparing the average amount of ice-cream dispensed by male students to the average amount ...
*Thursday, May 23, 2013 at 10:32pm*

**Statistics**

The mean and median sales prices of new homes sold in the U.S. in November 2010 were $213,000 and $268,000. Which of these numbers is the mean and which is the median? Explain how you know. I'm assuming the median is $213,000 and the mean is $268,000. However, I'm just...
*Wednesday, May 22, 2013 at 11:15pm*

**Math Models **

The scores on a standardized test are normally distributed with the mean of 750 and standard deviation 70. Find the probability that a score is more than 890. This is from my Math Models class. I am not taking Statistics. Please someone show me how to do answer this-I don'...
*Wednesday, May 22, 2013 at 2:36am*

**statistics**

a company decides to add a new program that prepares randomly selected sales personnel to increase their number of sales per month. The mean number of sales per month for the overall popualtion of sales people at this national company is 25 with a standard deviation of 4. The ...
*Monday, May 20, 2013 at 5:01pm*

**statistics**

A gambling game pays 4 to 1 and the chance of winning is 1 in 6. Suppose you bet $1 on this game 600 times independently.Find the expected number of times you win?
*Monday, May 20, 2013 at 4:29am*

**statistics**

Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that has 500,000 people. ...
*Monday, May 20, 2013 at 3:07am*

**statistics**

Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that has 500,000 people. ...
*Monday, May 20, 2013 at 3:07am*

** PSY210 Psychological Statistics**

Simply reporting measures of central tendency or measures of variability will not tell the whole story. Using the following information, what else does a psychologist need to know or think about when interpreting this information? A school psychologist decided to separate some...
*Monday, May 20, 2013 at 1:50am*

**statistics**

The body temp of normal healthy persons are normally distributed with a mean of 98.2 degrees F and a standard deviation od .62 degree F. If we define a fever to be a body temp above 100 degrees F, what percentage of normal and healthy person would be considered to have a fever?
*Sunday, May 19, 2013 at 7:00am*

**statistics**

For certain x and y series which are correlated, the two lines of regression are 5x-6y+9=0 , 15x-8y+130=0. The correlation coefficient is :
*Sunday, May 19, 2013 at 4:43am*

**PSY210 Psychological Statistics**

Simply reporting measures of central tendency or measures of variability will not tell the whole story. Using the following information, what else does a psychologist need to know or think about when interpreting this information? A school psychologist decided to separate some...
*Sunday, May 19, 2013 at 1:09am*

**Statistics**

A gambling game pays 4 to 1 and the chance of winning is 1 in 6. Suppose you bet $1 on this game 600 times independently. 3A Find the expected number of times you win. 3B Find the SE of the number of times you win. 3C Find the chance that you lose more than $50 (that is, your ...
*Saturday, May 18, 2013 at 12:34pm*

**Statistics**

A gambling game pays 4 to 1 and the chance of winning is 1 in 6. Suppose you bet $1 on this game 600 times independently. 3A - Find the expected number of times you win. 3B - Find the SE of the number of times you win. 3C - Find the chance that you lose more than $50 (that is...
*Saturday, May 18, 2013 at 10:55am*

**Statistics**

A group of 30 people consists of 15 children, 10 men, and 5 women. Tom and Jerry are two of the men in the group. Five people are picked at random without replacement. 2A - Find the chance the first person picked is a man, given that the fourth and fifth people picked are ...
*Saturday, May 18, 2013 at 10:24am*

**statistics**

A die has 2 red faces, 2 blue faces, and 2 green faces. It is rolled 240 times. Let R be the number of times red faces appear, and B the number of times blue faces appear. The random variable R is the sum of 240 draws at random with replacement from [pick all that are correct...
*Saturday, May 18, 2013 at 8:36am*

**statistics**

Rank the three events below in increasing order of probability. For example, if you choose â€œA B Câ€, you are saying that A has the smallest chance, B has more chance than A but less chance than C, and C has the biggest chance. [If you think ...
*Saturday, May 18, 2013 at 5:26am*

**Statistics**

An electronics company is about to launch a new product. If the serial number for each piece produced has the following format: LLNNN where L stands for any letter in the English alphabet and N is a number from 0 to 9, please answer the following: a)What is the name of the ...
*Thursday, May 16, 2013 at 4:04pm*

**statistics**

sample sizes of 5000, find the margin of error for each of the following sample proportion values: 0.1, 0.3, 0.5, 0.7, and 0.9
*Wednesday, May 15, 2013 at 9:28pm*

**MATHS STATISTICS**

B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by adjusting the ...
*Monday, May 13, 2013 at 11:14pm*

**MATHS STATISTICS**

A. According to an estimate, 50% of the people in the United States have atleast one credit card. If a random sample of 30 persons is selected, what is the probability that 19 of them has atleast one credit card? PLIZ REALLY NEED HELP!! THANKS VERY MUCH..
*Monday, May 13, 2013 at 8:55pm*

**math (statistics)**

A manufacturing company produces 10,000 plastic glasses per week. This company supplies plastic glasses to another company, which packages the glasses as part of picnic sets. The second company randomly samples 10 glasses from the supplier. If at least eight of the sampled ...
*Monday, May 13, 2013 at 6:00am*

**statistics**

A vending machine dispenses coffee into a twelve-ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.07 ounce. You can allow the cup to overfill 2% of the time. What amount should you set as the mean amount of coffee to...
*Sunday, May 12, 2013 at 8:53pm*

**Statistics**

City A has 1,000,000 people; City B has 4,000,000 people. Suppose the goal is to try to predict the percent of Purple Party voters in a sample. Other things being equal, a simple random sample of 1% of the people in City A has about the same accuracy as a simple random sample ...
*Sunday, May 12, 2013 at 12:29pm*

**Statistics**

A simple random sample of 50 students is taken from a class of 300 students. In the class, * the average midterm score is 67 and the SD is 12 * there are 72 women Let W be the number of women in the sample, and let S be the average midterm score of the sampled students. 1 - ...
*Sunday, May 12, 2013 at 12:24pm*

**statistics**

Consider a normal distribution with mean 20 and standard deviation 3. What is the probability a value selected at random from this distribution is greater than 20?
*Sunday, May 12, 2013 at 11:25am*

**statistics**

a basketball scout randomly selected 144 players and timed how longeach player took to perform a certain drill. The times in the sample were distributed with a mean of 8 mins. The population standard deviation was known to be 3 minutes. Using a 95% confidence interval, ...
*Sunday, May 12, 2013 at 5:08am*

**statistics**

find the area between z=0 and z=0.9 under the standard normal curve is
*Saturday, May 11, 2013 at 5:24pm*

**Statistics**

1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard...
*Thursday, May 9, 2013 at 1:16pm*

**Statistics**

A study in a particular state found that only 5% of the voters have Doctoral degrees. In a random sample of 200 voters, let x be the number who have doctoral degrees. 6) Find the mean of x. 7) Find the standard deviation of x. 8) Find the z-score for x...
*Thursday, May 9, 2013 at 12:20pm*

**statistics**

12 squirrels were found to have an average weight of 10.5 ounces with a sample standard deviation is 0.25. Find the 95% confidence interval of the true mean weight
*Wednesday, May 8, 2013 at 8:15pm*

**Statistics**

In roulette, the bet on a “split” pays 17 to 1 and there are 2 chances in 38 to win. The bet on “red” pays 1 to 1 and there are 18 chances in 38 to win. Compare the following two strategies: A: bet $1 200 times (independently) on a split B: bet $1 200 times...
*Wednesday, May 8, 2013 at 5:17pm*

**statistics**

A study performed by Bridge Ratings found that in 2006, 58% of respondents said they use a cell phone while traveling in a vehicle (the survey participants were restricted to individuals who spent at least one hour per day commuting in their vehicle). For a sample of 250 ...
*Wednesday, May 8, 2013 at 3:46pm*

**statistics**

The distribution of heights of American women aged 18 to 24 is approximately normally distributed with mean 65.5 inches and standard deviation 2.5 inches. What is the probability that a randomly selected woman is between 60 and 64 inches tall?
*Wednesday, May 8, 2013 at 3:45pm*

**statistics**

According to a USA Today poll conducted in February 2009, 83% of adults nationwide are in favor of funding new government programs to help create jobs. Calculate the mean number of adults in favor of funding new government programs to help create jobs in a random sample of 10 ...
*Wednesday, May 8, 2013 at 3:45pm*

**statistics**

A study involving the economic burden of congestive heart failure found that the lengths of hospital stays for patients had a mean of 7.8 days with a standard deviation of 9.1 days. For random samples of size 40, find the sample mean length of stay that is smaller than 10% of ...
*Wednesday, May 8, 2013 at 3:45pm*

**statistics**

According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Boston, MA, who did not work at home, was 28.2 minutes with a standard deviation of 0.79 minutes. A sample of 35 commute times is taken. ...
*Wednesday, May 8, 2013 at 3:44pm*

**statistics**

Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2°F and a standard deviation of 0.62°F. Suppose we take a sample of eight healthy adults. What is the probability that their mean body temperature will be greater than 98.4?
*Wednesday, May 8, 2013 at 3:44pm*

**statistics**

12. Suppose we are estimating p and we have no prior estimate of p. Find the required sample size for a confidence level of 90% and a margin of error of 0.02.
*Wednesday, May 8, 2013 at 3:43pm*

**statistics**

11. Suppose we are estimating m. What happens to the required sample size as the population standard deviation increases while the confidence level and desired margin of error remain constant? A) It increases. B) It decreases. C) It does not change.
*Wednesday, May 8, 2013 at 3:43pm*

**statistics**

10. Using the results of a Newsweek poll conducted in March of 2009, a 90% confidence interval on the proportion of adult Americans who have a favorable opinion of Barack Obama is given by (0.699, 0.741). If everything else is the same, but the confidence level increases, ...
*Wednesday, May 8, 2013 at 3:42pm*

**statistics**

Using the results of a Newsweek poll conducted in March of 2009, a 90% confidence interval on the proportion of adult Americans who have a favorable opinion of Barack Obama is given by (0.699, 0.741). What is the margin of error?
*Wednesday, May 8, 2013 at 3:40pm*

**statistics**

According to a Gallup Poll conducted in March of 2009, 38% of American adults polled believe that global warming will pose a serious threat to them or their way of life in their lifetime. Assuming a sample size of 1000, calculate a 95% confidence interval for estimating the ...
*Wednesday, May 8, 2013 at 3:40pm*

**statistics**

7. Determine whether it is appropriate to apply the Central Limit Theorem for Proportions: sample size 35, sample proportion 0.95. A) Yes B) No
*Wednesday, May 8, 2013 at 3:39pm*

**statistics**

6. Which distribution has the larger mean? i) t distribution, (df = 30) ii) standard normal distribution A) i) B) ii) C) They are the same.
*Wednesday, May 8, 2013 at 3:39pm*

**statistics**

5. What happens to the width of our confidence interval for m if we increase the sample size but keep the confidence level the same? A) It increases. B) It decreases. C) It stays the same. D) It depends on the sample mean and standard deviation.
*Wednesday, May 8, 2013 at 3:38pm*

**statistics**

4. The Pew Research Center reported that 57% of Americans favored the Wall Street bailout of 2008. A random sample of 300 people showed that 155 people favored the bailout. If appropriate, test whether the population proportion of Americans is different from 57%. Use level of...
*Wednesday, May 8, 2013 at 3:38pm*

**statistics**

The National Coalition on Healthcare suggests that the mean annual premium that a health insurer charges an employer for a health plan covering a family of four averaged $12700 in 2008. A sample of 30 families of four yield a mean annual premium paid by their employer to be $...
*Wednesday, May 8, 2013 at 3:37pm*

**statistics**

2. We would like to test whether the population mean is less than 40. Suppose that a hypothesis test is conducted to determine if the mean of the population has decreased or not. Describe what a Type II error would mean for this example. A) Reject H0 when the population mean ...
*Wednesday, May 8, 2013 at 3:37pm*

**statistics**

According to CreditReport, the mean credit score in Georgia for 2007 was 668. Suppose that a hypothesis test is conducted to determine whether the mean credit score in Georgia has decreased since that time. Describe what a Type I error would mean in the context of this problem...
*Wednesday, May 8, 2013 at 3:36pm*

**statistics**

students who learned English as well as another language simultaneously score worse on the SAT critical Reading exam than the general population of test takers? The mean score among all test takers on SAT Critical Reading exam is 501 A random sample of 100 test takers who ...
*Wednesday, May 8, 2013 at 12:12pm*

**statistics**

do students who learned English as well as another language simultaneously score worse on the SAT critical reading exam than the general population of test takers? the mean score di 501. A random sample of 100 test takers who learned English as another language simultaneously ...
*Wednesday, May 8, 2013 at 12:08pm*

**statistics**

plain type fonts such as times new roman are easier to rean than fancy fonts such as gigi. a group of 25 voulunteer subjects read the same text in both fonts. (this is a matched pairs design. One-sample procedures for proportions, like those for means, are used to analyze data...
*Wednesday, May 8, 2013 at 11:18am*

**statistics**

Merchandise inventory purchases for a firm for a three-month period are: January: 2,000 units @ $12 per unit; February: 1,800 @ $14 per unit; March 2,600 units @ 15 per unit. What is the mean unit cost of merchandise inventory?
*Wednesday, May 8, 2013 at 10:37am*

**Data Gathering and Inference**

When the production manager finds the average life of her bulb-lifetime data, it is an example of what phase of inferential statistics? A. Data organization. B. Data gathering. C. Data analysis. D. Probability-based inference.
*Wednesday, May 8, 2013 at 10:20am*

**Statistics**

You have a ten question multiple choice test in your next class and you did not study at all. Each question has four choices and only one correct answer. You are going to guess on each question. What is the probability that you score at least a 20% on the test.
*Tuesday, May 7, 2013 at 5:34pm*

**statistics**

Find the value of Z that is smaller than 90% of all values of Z.
*Tuesday, May 7, 2013 at 3:46pm*

**statistics**

Participants from the National Health and Nutrition Examination Survey, 2003–2004, had a mean BMI of 28.3 with a standard deviation of 6.0. Assuming BMI is normally distributed, what proportion of the participants had a BMI measure over 35?
*Tuesday, May 7, 2013 at 3:45pm*

**statistics**

According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Boston, MA, who did not work at home, was 28.2 minutes with a standard deviation of 0.79 minutes. A sample of 35 commute times is taken. ...
*Tuesday, May 7, 2013 at 3:43pm*

**statistics**

A certain professional soccer team runs a 4-4-2 formation on the field. This means they play with 4 defenders, 4 midfielders, 2 forwards, and 1 goalkeeper on the field. If the team has 6 defenders, 5 midfielders, 3 forwards, and 2 goalkeepers, how many different groups of 11 ...
*Tuesday, May 7, 2013 at 3:40pm*

**statistics**

Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2°F and a standard deviation of 0.62°F. Find the 90th percentile of the sample mean body temperatures for samples of size 16.
*Tuesday, May 7, 2013 at 3:12pm*

**Statistics**

If x is a binomial variable with p = .4 and n = 25, write the probability that you would be looking for after you have applied the continuity correction factor for the following conditions for x: 3) x = 5 4) x > 5 5) x ≤ 5
*Tuesday, May 7, 2013 at 12:14pm*

**Probability and Statistics**

There are 15 marbles in a jar.Five are red,four are blue, and six are yellow.If you draw two blue at random (without replacement), what is the probability that the second marble is blue?
*Monday, May 6, 2013 at 9:05pm*

**statistics**

The probablility that a person drinks at least five cups of coffee per day is .24, and the probability that a person has high blood pressure is .08. Assuming that these two events are independent, find the probability that a person selected at random drinks less than five cups...
*Monday, May 6, 2013 at 8:00pm*

**statistics**

A player pays a $1 to play a game. With probability 0.001 the player wins $900, with probability 0.005 the players wins $10. What is the players expected win per game?
*Monday, May 6, 2013 at 4:44pm*

**statistics**

A random number generator draws at random with replacement from the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. In 5000 draws, the chance that the digit 0 appears fewer than 495 times is closest to 25%,30%,35%,40%,45%,50%
*Monday, May 6, 2013 at 2:28pm*

**Statistics**

A true-false test consists of 20 questions, each of which has one correct answer: true, or false. One point is awarded for every correct answer, but one point is taken off for each wrong answer. Suppose a student answers every question by guessing at random, independently of ...
*Monday, May 6, 2013 at 7:15am*

**statistics**

A manufacturing company produces 10,000 plastic glasses per week. This company supplies plastic glasses to another company, which packages the glasses as part of picnic sets. The second company randomly samples 10 glasses from the supplier. If at least eight of the sampled ...
*Sunday, May 5, 2013 at 11:52pm*

**Math- Statistics **

Suppose 60% of adults have a college degree. If I take a random sample of 80 adults, what is the probability at least 50% of them have a college degree?
*Sunday, May 5, 2013 at 10:57pm*

**statistics **

A test has 1 true false question and 2 multiple choice questions(A B C D). Draw a tree diagram and determine the sample space for the possible ways to answer the test.
*Sunday, May 5, 2013 at 9:00pm*

**statistics**

The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound-shaped and symmetric with a mean of 24.6 mpg and a standard deviation of 11.2 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by ...
*Sunday, May 5, 2013 at 8:15pm*

**statistics**

No calculation required. what test would be used to predict what the tuition will be in 20 years if it has gone up the past five years?
*Sunday, May 5, 2013 at 7:35pm*

**Statistics 7**

A doctor wants to estimate the HDL cholesterol of all 20 to 29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99% confidence assuming s-17.8 based on earlier studies. Suppose the doctor would be content with 90 % confidence...
*Sunday, May 5, 2013 at 6:11pm*

**STATISTICS**

Determine the point estimate of the population mean and margin of error for the confidence interval. Lower bound is 15, upper bound is 27. A)The point estimate of the population mean is ________. B) The margin for error for the confidence interval is _______. HELP
*Sunday, May 5, 2013 at 5:26pm*

**Statistics**

A researcher wishes to estimate the proportion of adults who have high-spped internet access. What size sample should be obtained if she wishes the estimate to be within .02 with 90% if A) She uses a previous estimate of 0.48? B) She does not use any prior estimates? Please ...
*Sunday, May 5, 2013 at 5:22pm*

**Statistics**

Maureen is a cocktail hostess in a very exclusive private club. The IRS is auditing her tax return. Maureen claims that her average tip last year was $4.75. To support this claim, she sent the IRS a random sample of 52 credit card receipts showing her bar tips. When the IRS ...
*Sunday, May 5, 2013 at 4:51pm*

**Statistics**

A random sample of 10 independent observations from a normally distributed population yielded the following values 51, 53, 49, 43, 47, 46, 45, 30, 60, 52. a) Estimate the standard deviation of the sampling distribution of means for samples like this one. b) Using á = ....
*Sunday, May 5, 2013 at 2:25pm*

**statistics**

The attendance at the school play on Friday was 95% of the attendance on Saturday night. If 203 people attended on Saturday night, estimate how many attended on Friday night. a minute agoEdit Question
*Sunday, May 5, 2013 at 9:58am*

**life orientation**

1.Identify and describe 3environment health hazards that cause ill health,crises and or disasters within your community or any other community within south africa and globaLly.include evidence that is current of the identifted issues.use graphs,statistics,pictures. 2....
*Sunday, May 5, 2013 at 5:56am*

**statistics**

the percent defective for parts produced by a manufacturing process is targeted at 4%. The process is monitored daily by taking samples of sizes n=160 units. Suppose that today's sample contains 14 defectives. How many units would have to be sampled to be 95% confident ...
*Saturday, May 4, 2013 at 4:47pm*

**Statistics**

A certain lottery is won by selecting the correct four numbers from 1,2....30. The probability of winning if the rules are changed so that in addition to selecting the correct four numbers you must now select them in the same order as they are drawn?
*Saturday, May 4, 2013 at 3:37pm*

**Statistics**

The world’s smallest mammal is the bumblebee bat. Such bats are roughly the same size of a large bumblebee. Listed below are the weights (in grams) from a sample of these bats. Assuming that all such bats have a standard deviation of .3 grams, use a significance level of...
*Saturday, May 4, 2013 at 1:21pm*

**statistics**

A manufacturing company produces 10,000 plastic glasses per week. This company supplies plastic glasses to another company, which packages the glasses as part of picnic sets. The second company randomly samples 10 glasses from the supplier. If at least eight of the sampled ...
*Saturday, May 4, 2013 at 3:26am*

**Statistics**

The Education Testing Service conducted a study to investigate differences between the scores of males and females on the SAT. The study identified a random sample of 562 females and 852 males that had achieved the same high score on the math portion of the test. That is, both...
*Friday, May 3, 2013 at 10:40pm*

**statistics**

A firm having 4000 employees took a random sample of 25 in order to estimate their average annual state tax payment with 99% confidence. If the results were X = $640 and s = $20, what is the best interval estimation?
*Friday, May 3, 2013 at 10:37pm*

**Statistics**

For questions 1-5, write the null and alternative hypothesis. 1. Does the water temperature have an effect on the number of people in the pool? 2. Does the weather have an effect on the number of people at the beach? 3. A fitness center is running a discounted membership fee. ...
*Friday, May 3, 2013 at 11:47am*

**Statistics**

1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard...
*Friday, May 3, 2013 at 11:45am*

**statistics**

400 draws are made at random with replacement from 5 tickets that are marked -2, -1, 0, 1, and 2 respectively. Find the expected value of: 1. the number of times positive numbers appear 2. the sum of all the numbers drawn 3. the sum of the positive numbers drawn
*Friday, May 3, 2013 at 4:34am*

**Statistics**

One of your friends is comparing yeast fermentation rates when yeast is grown in a solution containing glucose (G) and when grown in a solution containing starch (S). The friend starts with no expectations about which feeding medium will give higher yields but after seeing the...
*Friday, May 3, 2013 at 3:39am*

**Statistics**

In planning a study of the birth weights of babies whose mothers did not see a doctor while pregnant, a researcher writes the hypotheses as H0: x̄ = 2250 grams versus H1: x̄ < 2250 grams. What is wrong with this?
*Friday, May 3, 2013 at 3:37am*

**statistics**

A sample survey interviews an SRS of 263 college women. Suppose (as is roughly true) that 75% of all college women have been on a diet within the past 12 months. Using the Normal approximation, what is the probability (±0.001) that 82% or more of the women in the sample...
*Thursday, May 2, 2013 at 10:48pm*

**statistics**

Linda Silbers is a social scientist studying voter opinion about a city bond proposal for a light rail mass transit system in Denver If Linda wants to be 90 percent Confident that her sample estimate of the proportion of voters who favor the bond is within 2 percent of the ...
*Thursday, May 2, 2013 at 9:35pm*

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