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July 28, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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Statistics
Suppose a box of marbles contains equal numbers of red marbles and yellow marbles but twice as many green marbles as red marbles. Draw one marble from the box and observe its color. Assign probabilities to the elements in the sample space. (Give your answers as fractions.) Red...
Sunday, May 26, 2013 at 3:28pm

statistics
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
Sunday, May 26, 2013 at 2:49pm

statistics
A and B are events defined on a sample space, with the following probabilities. Find P(A and B). (Give your answer correct to two decimal places.) P(A) = 0.5 and P(B | A) = 0.4
Sunday, May 26, 2013 at 2:10pm

statistics
Find P(A or B). (Give your answer correct to two decimal places.) P(A) = 0.35, P(B) = 0.5, and P(A and B) = 0.18
Sunday, May 26, 2013 at 2:08pm

statistics
These data were generated using the equation y = 2x + 1. A scatter diagram of the data results in five points that fall perfectly on a straight line. x 0 1 2 3 4 y 1 3 5 7 9 (a) Find the correlation coefficient.
Sunday, May 26, 2013 at 1:53pm

Statistics
Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...
Sunday, May 26, 2013 at 12:06pm

statistics
Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...
Sunday, May 26, 2013 at 10:58am

statistics
I have got all the other parts but not sure how to come up with this part????In a national survey of 500 business and 500 leisure travelers, each was asked where they would most like "more space." ----------------------------------------​...
Sunday, May 26, 2013 at 10:54am

Statistics
The accompanying data show the number of hours, x, studied for an exam and the grade received, y (y is measured in tens; that is, y = 8 means that the grade, rounded to the nearest 10 points, is 80). x 2 3 3 4 5 5 5 6 6 6 7 7 7 7 8 y 5 5 6 5 6 7 8 6 9 8 7 9 10 8 9 Maple ...
Sunday, May 26, 2013 at 10:05am

Statistics
Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car ...
Sunday, May 26, 2013 at 8:37am

Statistics
Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car ...
Saturday, May 25, 2013 at 11:22pm

Statistics
The relationship between the number of games won during one season by a minor league baseball team and the average attendance at their home games is analyzed. A regression analysis to predict the average attendance from the number of games won gives the model y-hat = -2600 + ...
Saturday, May 25, 2013 at 11:19pm

statistics
Can someone work this out for me, so I can use as an example to do the other ones. Does it pay to study for an exam? The number of hours studied, x, is compared to the exam grade received, y. x 4 4 6 1 1 y 75 90 95 60 80 (a) Find the equation for the line of best fit. (Give ...
Saturday, May 25, 2013 at 11:10pm

MATH315 Elementry Statistics
A researcher surveyed college students to study their opinion about the proposed change in smoking rules. The researcher asked a group of 30 students: 12 of them supported the change, 13 of them did not, and 5 had no opinion. This is not a binomial model because... A. ...there...
Saturday, May 25, 2013 at 10:27pm

Statistics
Scores on a mathematics examination appear to follow a normal distribution with mean of 65 and standard deviation of 15. The instructor wishes to give a grade of “C” to students scoring between the 60th and 70th percentiles on the exam. What score represents the 60th...
Saturday, May 25, 2013 at 10:23pm

Statistics
X Y 0 23 2 27 2.3 29 4.1 32 5 35 What is the correlation for this data set? 10) Find the regression line for this data set.
Saturday, May 25, 2013 at 3:58pm

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 “A B C”, 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

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