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September 20, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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Statistics
Complete the hypothesis test with alternative hypothesis ƒÊd ‚ 0 based on the paired data that follows and d = O - Y. Use ƒ¿ = 0.01. Assume normality. Oldest 174 173 169 180 51 Youngest 168 169 175 187 53 (a) Find t. (Give your answer correct ...
Tuesday, October 29, 2013 at 4:23pm

Statistics
Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G 375 324 H 414 333
Tuesday, October 29, 2013 at 1:54pm

Statistics
Help Me Please! In a survey of families in which both parents work, one of the questions asked was, "Have you refused a job, promotion, or transfer because it would mean less time with your family?" A total of 200 men and 200 women were asked this question. "Yes...
Tuesday, October 29, 2013 at 1:53pm

Statistics
Please Help! If someone could just show me how to do a problem like this! The corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan. The data collected are summarized below, where d is the amount of corrosion on the ...
Tuesday, October 29, 2013 at 1:51pm

Statistics
HIM department at Community Hospital will experience a 15 percent increase in the number of discharges coded per day as the result of opening a cardiac clinic in the facility. The 15 percent incrase is projected to be 100 additional records per day. The standard time to code ...
Tuesday, October 29, 2013 at 11:32am

statistics
Find the uniform continuous probability for P(X < 27) for U(0, 50). I need the formula to figure out with 4 place decimal place as an answer
Monday, October 28, 2013 at 10:17pm

Statistics
Find the 99% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.) Sample Number Mean ...
Monday, October 28, 2013 at 10:03pm

Statistics
Please Help I'm desperate! Complete the hypothesis test with alternative hypothesis ìd < 0 based on the paired data that follow and d = M - N. Use á = 0.02. Assume normality. M 48 47 67 79 73 66 N 52 55 68 87 78 70 (a) Find t. (Give your answer correct to ...
Monday, October 28, 2013 at 10:02pm

Statistics
Which is true about a 99% confidence interval for a population proportion based on a given sample? I. We are 99% confident that the population proportion is in our interval. II. There is a 99% chance that our interval contains the sample proportion. III. The interval is wider ...
Monday, October 28, 2013 at 3:43pm

Statistics
The coding department of a large physician clinic is interested in purchasing a software program that will edit claims before they are sent out to billing. The license fee for the software costs $34,000 per year. The software is expected to reduce the number of errors on ...
Monday, October 28, 2013 at 2:57pm

Statistics Math
The sample proportion is never equal to the population proportion We expect 95% confidence intervals to contain the sample proportion 95% of the time Are the above statements true? I would say yes because the sample proportion is not the same as the population proportion and ...
Monday, October 28, 2013 at 1:27pm

Statistics Math
Pye and Associates recently conducted a survey to determine the percent of adult county residents who believe that students in public high schools should wear uniforms to school. The telephone poll of 325 adults found that 35% of the adults believe that public high school ...
Monday, October 28, 2013 at 1:23pm

Statistics
All the patients who present to the emergency services dept with a suspecetd AMI are expected to receive an ECG within 10 mins of their arrival. Of the 56 patients who had a suspected AMI during the last quarter, 32 had an ECG within the specified time frame, what was the rate...
Monday, October 28, 2013 at 1:11pm

Statistics
A city ballot includes a local initiative that would legalize gambling. The issue is hotly contested, and two groups decide to conduct polls to predict the outcome. The local newspaper finds that 53% of 1200 randomly selected voters plan to vote "yes," while a ...
Monday, October 28, 2013 at 12:55pm

Statistics
the forms used in your coding area cost $100.00 per 1,000 forms for the first 2,000 and $50 for every 1,000 thereafter. If you need to order 5,000 forms, what is the total cost?
Monday, October 28, 2013 at 12:27pm

Statistics
HIM department at Community Hospital will experience a 15 percent increase in the number of discharges coded per day as the result of opening a cardiac clinic in the facility. The 15 percent incrase is projected to be 100 additional records per day. The standard time to code ...
Monday, October 28, 2013 at 11:51am

Statistics
A local grocery store wants to estimate the mean daily number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution, with a population standard deviation of 5.10 gallons. A random sample of 60 days shows that the mean daily ...
Sunday, October 27, 2013 at 11:31pm

Health statistics
Of the 5,352 requests for medical records in the question above, 4,257 were located within the 20-minute time frame established by the supervisor as a quality improvement indicator. What is the rate of compliance in answering requests for records? Round to two decimal points.
Sunday, October 27, 2013 at 10:46pm

Statistics
A university has 1,000 computers available for students to use. Each computer has a 250-gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation ...
Sunday, October 27, 2013 at 9:30pm

Statistics
A city ballot includes a local initiative that would legalize gambling. The issue is hotly contested, and two groups decide to conduct polls to predict the outcome. The local newspaper finds that 53% of 1200 randomly selected voters plan to vote "yes," while a ...
Sunday, October 27, 2013 at 9:20pm

Statistics
In 1998 a San Diego Reproductive clinic reported 49 live births to 207 women under the age of 40 who had previously been unable to get pregnant. Using the 90% confidence interval calculated above, would it be misleading for the clinic to report a success rate of 25%? A) Yes, ...
Sunday, October 27, 2013 at 9:15pm

statistics
If GMAT scores for applicants at Oxnard Graduate School of Business are N(500, 50) then the top 5 percent of the applicants would have a score of at least (choose the nearest integer):
Sunday, October 27, 2013 at 9:15pm

statistics
Which is relatively better a score of 48 on psychology test or a score of 52 on an economics test, Scores on the psychology test have a mean of 87 and a standard deviation of 14. Scores on the economics test have a mean of 53 and a standard deviation of 8.
Sunday, October 27, 2013 at 9:08pm

Statistics
The weight of a bag of corn chips is normally distributed with a mean of 22 ounces and a standard deviation of 0.5 ounces. -The probability that a bag of corn chips weighs more than 21 ounces is? -The probability that a bag of corn chips weighs between 20.75 and 23.25 ounces is?
Sunday, October 27, 2013 at 7:57pm

Statistics
Direct mail advertisers send solicitations (that is "junk mail") to thousands of potential customers in the hope that some will buy the company's products. The response rate is usually quite low. Suppose a company wants to test the response rate for a new flyer ...
Sunday, October 27, 2013 at 6:48pm

statistics
Forty-four percent of customers who visit a department store make a purchase. The probability, rounded to four decimal places, that in a random sample of 9 customers who will visit this department store, exactly 6 will make a purchase is:
Sunday, October 27, 2013 at 5:10pm

statistics
Forty-four percent of customers who visit a department store make a purchase. The probability, rounded to four decimal places, that in a random sample of 9 customers who will visit this department store, exactly 6 will make a purchase is:
Sunday, October 27, 2013 at 5:04pm

Statistics Math
1. What type of car is more popular among college students, American or foreign? One hundred fifty-nine college students were randomly sampled and each was asked which type of car he or she prefers. A computer package was used to generate the printout below for the proportion ...
Sunday, October 27, 2013 at 4:45pm

Statistics
We have calculated a 95% confidence interval for a proportion and would prefer the confidence interval to be more precise, that is narrower. Using the same sample, we can narrow the confidence interval using which of the following? A) increasing the confidence level B) ...
Sunday, October 27, 2013 at 9:07am

Statistics
In a poll of voters in a certain city, 32% said that they backed a bill which would limit growth and development in their city. The margin of error was reported as 1.7% with 90% confidence. Determine the bounds for the confidence interval. A) (88.3%, 91.7%) B) (30%, 34%) C) (...
Sunday, October 27, 2013 at 9:05am

statistics
Thirty-two percent of adults did not visit their physicians' offices last year. The probability, rounded to four decimal places, that in a random sample of 8 adults, exactly 3 will say they did not visit their physicians' offices last year is:
Saturday, October 26, 2013 at 7:54pm

Statistics
Which of the following is not an assumption or condition that needs to be checked for the one-proportion z-interval? A) Success/Failure Condition B) > 10% condition C) Independence D) < 10% Condition E) Randomization Is the answer C?
Saturday, October 26, 2013 at 9:46am

Statistics
A study of 902 decisions (to grant parole or not) made by the Nebraska Board of Parole produced the following 95% confidence interval: (56.1%, 62.5%) What is the margin of error? A) 1% B) 6.4% C) 59.3% D) 3.2% Is the answer C?
Saturday, October 26, 2013 at 9:45am

statistics
A survey among US adults of their favorite toppings on a cheese pizza reported that 43% favored pepperoni, 14% favored mushrooms, and 6% favored both pepperoni and mushrooms. What is the probability that a random adult favored pepperoni or mushrooms on their cheese pizza? ...
Thursday, October 24, 2013 at 6:29pm

Statistics
12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known allergies to poison ...
Thursday, October 24, 2013 at 5:22pm

Statistics
12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known allergies to poison ...
Thursday, October 24, 2013 at 4:09pm

Statistics
6)You are given the information that P(A) =0.30 and P(B) =0.40 (a) Do you have enough information to compute P(A or B)? Explain.(events A and B are mutually b) If you know that events A and B are mutually exclusive , do you have enough information to compute P(A or B)? Explain...
Thursday, October 24, 2013 at 3:59pm

statistics
a sample of 50 women is obtained and their heights (in inches) and pulse rates (in beats per min) are measured. the linear correlation coefficient is 0.229 and the equation of the regression line y= 17.9 +0.870x where x represents hight. the mean of the 50 heights is 63.1 in ...
Tuesday, October 22, 2013 at 8:13pm

Statistics
The average teacher's salary in North Dakota is $41,027. Assume a normal distribution with standard deviation of $5200. A. what is the probability that a randomly selected teachers salary is less than 40,000? B. What is the probability that the mean for a sample of 80 ...
Monday, October 21, 2013 at 5:36pm

Statistics
During September, the average temp of laurel lake is 64.2 degrees. the standard deviation is 3.2 degrees. Assume the variable is normally distributed. For the randomly selected day, find the probability that the temp will be a. above 62 degrees b. below 67 degrees c. between ...
Monday, October 21, 2013 at 5:33pm

Statistics
Dear Sue, I need your help concerning the below questions. Thank you. The coding department of a large physician clinic is interested in purchasing a software program that will edit claims before they are sent out to billing. The license fee for the software costs $34,000 per ...
Sunday, October 20, 2013 at 10:55pm

Statistics
The coding department of a large physician clinic is interested in purchasing a software program that will edit claims before they are sent out to billing. The license fee for the software costs $34,000 per year. The software is expected to reduce the number of errors on ...
Sunday, October 20, 2013 at 10:44pm

statistics
A university has 1000 computers available for students to use. Each computer has a 250 gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of...
Sunday, October 20, 2013 at 6:24pm

Statistics
a. Critical Thinking Critical Thinking Suppose you and a friend each take different random samples of data pairs (x,y) from the sample population. Assume the samples are the same size. Based on your samples, you compute r= 0.83. Based on her sample, your friend computes r = 0....
Sunday, October 20, 2013 at 4:08pm

Statistics
What is the percentage of immigrants living here in the U.S. legally? Of these people, how many are naturalized? I've tried looking this up, but either the article was made without the full 2012 census or it talked about illegal immigrants.
Sunday, October 20, 2013 at 11:15am

Statistics
A sociologist is interested in the relations between x=number of job changes and y=annual salary (in thousands of dollars) for people living in the Nashville area. A random sample of 10 people employed in Nashville provided the following information: X(Number of job changes)4 ...
Sunday, October 20, 2013 at 2:02am

Statistics
Suppose you and a friend each take different random samples of data pairs (x,y) from the same population. Assume the samples are the same size. Based on your samples, you compute r = 0.83. Based on her sample your friend computes 0.79. Is your friend’s value for r wrong? ...
Sunday, October 20, 2013 at 1:57am

Statistics
Last month, the release of information specialist received 232 requests for information. He was able to answer 176 within the specified time frame of three working days. What is the rate of compliance in answering requests within the specified time frame?
Saturday, October 19, 2013 at 6:09pm

Statistics
The health information managemnet supervisor agrees to pay a new graduate $13.50 per hour. This is a full-time coding position at 2,080 hours per year. The cost for a full-time employee's fringe benefits is 24 percent of the employee's salary. How much must the ...
Saturday, October 19, 2013 at 5:16pm

Statistics
The health information managemnet supervisor agrees to pay a new graduate $13.50 per hour. This is a full-time coding position at 2,080 hours per year. The cost for a full-time employee's fringe benefits is 24 percent of the employee's salary. How much must the ...
Saturday, October 19, 2013 at 5:03pm

Statistics
The health information management department at Community Hospital will experience a 15 percent increase in the number of discharges coded per day as the result of opening a cardiac clinic in the facility. The 15 percent increase is projected to be additional rrecords per day...
Saturday, October 19, 2013 at 4:44pm

Statistics
A coding supervisor must determine the number of full-time equivalents (FTEs) needed to code 500 discharges per week. If it takes an average of 20 minutes to code each record and each coder works 7.5 productive hours per day, how many FETs will the coding supervisor need?
Saturday, October 19, 2013 at 4:22pm

Statistics
It takes approximately 15 minutes to code one record. How many personnel hours would be needed to code 1,424 discharges for the month?
Saturday, October 19, 2013 at 4:13pm

Statistics
An employee currently earning $13.85 per hour has been awarded a 3.5 percent merit raise. What will the employee's hourly salary be with this increase?
Saturday, October 19, 2013 at 3:59pm

statistics
After one month of operation the health information services at community health center determined that there were two reords misfiled out of the 450 active records. What is the filing accuracy rate for this area?
Saturday, October 19, 2013 at 3:51pm

statistics
Community Health center, a new patient clinic in your town serving only underinsured and uninsured patients, has asked you to help its health information management department get started. calculate the number of new shelving units needed for a medical record filing system ...
Saturday, October 19, 2013 at 3:41pm

Statistics
Serena Williams won the 2010 Wimbledon Ladies Singles Championship. For the seven matches she played in the tournament, her total number of first serves was 379, total number of good first serves was 256, and total number of double faults was 15. a. Find the probability that ...
Friday, October 18, 2013 at 2:01pm

statistics
According to the Current Population Survey of the Census Bureau, 67% of children live with both parents, 23% live with their mother only, and 5% live with their father only. The rest live with neither parent. If we choose a child at random, what is the probability that the ...
Friday, October 18, 2013 at 11:55am

Statistics
What is the mean and standard deviation of 63.7%? What is the mean and standard deviation of 61.4%? Using the 68-95-99.7 rule, describe the sampling distribution of 63.7% Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%? Please help I am so lost...
Thursday, October 17, 2013 at 6:05pm

statistics
It has been reported that 86% of federal government employees use email. If a sample of 175 federal government employees is selected, find the mean, varience, and standard deviation of the number who use email.
Wednesday, October 16, 2013 at 9:18pm

Statistics
What is the mean and standard deviation of 63.7%? What is the mean and standard deviation of 61.4%? Using the 68-95-99.7 rule, describe the sampling distribution of 63.7% Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%? Please help I am so lost...
Wednesday, October 16, 2013 at 7:40pm

statistics
According to the Current Population Survey of the Census Bureau, 67% of children live with both parents, 23% live with their mother only, and 5% live with their father only. The rest live with neither parent. If we choose a child at random, what is the probability that the ...
Wednesday, October 16, 2013 at 4:19pm

statistics
When Trevor and Brian play ping pong, the probability that Trevor will win is 0.6. If Trevor and Brian play two games of ping pong, find the probability that Trevor wins the first game and Brian wins the second. Assume games are independent. Give your answer as a decimal to ...
Wednesday, October 16, 2013 at 4:05pm

statistics
Assume that blood pressure readings are normally distributed with a mean of 123 and a standard deviation of 9.6. If 144 people are randomly selected, find the probability that their mean blood pressure will be less than 125.
Monday, October 14, 2013 at 7:51pm

math
Our statistics students, as noted were asked to rate their admiration of Hillary Rodham Clinton on a scale of 1 to 7. They also were asked to rate their admiration of Jennifer Lopez and Venus Williams on a scale of 1 to 7. As noted earlier, the mean rating of Clinton was 4.06...
Monday, October 14, 2013 at 4:11pm

math
A sample of 148 of our statistics students rated their level of admiration for Hillary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06, and the standard deviation was 1.70. (For this exercise, treat this sample as the entire population of interest.) a. Use these ...
Monday, October 14, 2013 at 4:11pm

Statistics
In a survey, 55% of the voters support a particular referendum. If 30 voters are chosen at random, find the standard deviation of the number of voters who support the referendum.
Monday, October 14, 2013 at 4:09pm

Statistics
Smoking habit Socioeconomic status High Low Smoking 15 40 55 Not smoking 25 10 35 Total 40 50 N=90 a. For these ordinal variables, which hypothesis testing is appropriate to test the relationship between SES and smoking habits variable? b. Write the HO and H1 c. Perform the ...
Monday, October 14, 2013 at 3:42pm

Statistics
2. A researcher wants to find out how students feel about a proposal to ban smoking on campus. She selected THREE groups of “students who currently smoke”, “students who formerly smoke”, and “students who never smoke”. Also, she selects a sample ...
Monday, October 14, 2013 at 1:30pm

statistics
Give three reasons why z scores are useful.
Monday, October 14, 2013 at 12:44pm

statistics
A study of the Consideration of Future Consequences(CFC) scale found a mean score of 3.51, with a standard deviation of 0.61, for the 664 students in the sample(Petrocelli, 2003). For the sake of this exercise, let’s assume that this particular sample comprises the ...
Monday, October 14, 2013 at 12:44pm

statistics
A sample of 148 of our statistics students rated their level of admiration for Hillary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06, and the standard deviation was 1.70. (For this exercise, treat this sample as the entire population of interest.) a. Use these ...
Monday, October 14, 2013 at 12:43pm

statistics
Our statistics students, as noted were asked to rate their admiration of Hillary Rodham Clinton on a scale of 1 to 7. They also were asked to rate their admiration of Jennifer Lopez and Venus Williams on a scale of 1 to 7. As noted earlier, the mean rating of Clinton was 4.06...
Monday, October 14, 2013 at 12:42pm

statistics
1. In an ANOVA, one group has a much larger sample mean than the other. The analyst decides to remove this group and to conduct the analysis on the remaining groups only. Which of the following statements is correct? Select one: a. This analysis is not correct, as now the ...
Monday, October 14, 2013 at 7:36am

statistics
A sample has a mean of M 40 If a score of X 55 is removed from the sample then the sample mean will increase
Sunday, October 13, 2013 at 6:27pm

STAT
Given a sample size of 18, with sample mean 660.3 and sample standard deviation 95.9, we are to perform the following hypothesis testing: Null Hypothesis H0 : µ = 700 Research Hypothesis H1 : µ ≠ 700 •What is the test statistics? •At a 0.05 ...
Sunday, October 13, 2013 at 9:15am

math
Our statistics students, as noted in Exercise 6.32, were asked to rate their admiration of Hillary Rodham Clinton on a scale of 1 to 7. They also were asked to rate their admiration of Jennifer Lopez and Venus Williams on a scale of 1 to 7. As noted earlier, the mean rating of...
Saturday, October 12, 2013 at 11:23pm

math
A sample of 148 of our statistics students rated their level of admiration for Hillary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06, and the standard deviation was 1.70. (For this exercise, treat this sample as the entire population of interest.) a. Use these ...
Saturday, October 12, 2013 at 11:20pm

STAT
The weights of the 100 students in an introductory statistics class are normally distributed, with a mean of 170 pounds and a standard deviation of 5 pounds. How many students would you expect to have weight between 162 pounds and 178 pounds? What is the probability that a ...
Saturday, October 12, 2013 at 9:26pm

College probability and statistics
The current license plates in New York State consist of three letters followed by four digits. ( i ) How many possible distinct license plates can there be? ( ii ) How many possible distinct license plates could there be if the letters O and I and the digits, 0 and 1 were ...
Saturday, October 12, 2013 at 5:30pm

STAT
The weights of the 100 students in an introductory statistics class are normally distributed, with a mean of 170 pounds and a standard deviation of 5 pounds. 1)How many students would you expect to have weight between 162 pounds and 178 pounds? 2)What is the probability that a...
Saturday, October 12, 2013 at 12:32pm

STAT
The weights of the 100 students in an introductory statistics class are normally distributed, with a mean of 170 pounds and a standard deviation of 5 pounds. How many students would you expect to have weight between 162 pounds and 178 pounds?
Saturday, October 12, 2013 at 12:31pm

STAT
Given a sample size of 18, with sample mean 660.3 and sample standard deviation 95.9, we are to perform the following hypothesis testing: Null Hypothesis H0 : µ = 700 Research Hypothesis H1 : µ ≠ 700 •What is the test statistics? •At a 0.05 ...
Saturday, October 12, 2013 at 12:27pm

statistics
How many friends must you have to guarantee that at least five of them will have birthdays in the same month?
Friday, October 11, 2013 at 2:35pm

college statistics
7. Mary goes into the supermarket. The probability that she buys (a) regular coffee is .30, (b) decaffeinated coffee is .40, and (c) that she buys both is .30. What is the probability that she buys regular coffee, decaffeinated coffee, or both?
Thursday, October 10, 2013 at 10:51pm

college statistics
2. A researcher has developed a new questionnaire for measuring dominance and would like to estimate the population parameters for the test scores. The questionnaire is administered to a sample of n = 25 subjects. This sample has an average score of mean = 43 with SS = 2400. ...
Thursday, October 10, 2013 at 10:51pm

statistics
6. Out of eight numbers, what is the probability of drawing a two on the first draw and a three on the second draw using sampling with replacement?
Thursday, October 10, 2013 at 10:41pm

statistics
5. Find the weighted mean of the following two samples. Sample 1: n = 5 and the mean = 20 Sample 2: n = 15 and the mean = 10.
Thursday, October 10, 2013 at 10:40pm

statistics
2. A researcher has developed a new questionnaire for measuring dominance and would like to estimate the population parameters for the test scores. The questionnaire is administered to a sample of n = 25 subjects. This sample has an average score of mean = 43 with SS = 2400. ...
Thursday, October 10, 2013 at 10:39pm

statistics
Find the operating characteristics of this system. An airport ticket counter has a service rate of 180 per hour, exponentially distributed, with Poisson arrivals at the rate of 120 per hour
Thursday, October 10, 2013 at 11:44am

statistics
In 2006, 75.9% of first-year students said they used the Internet for research or homework. Administrators found that 168 of an SRS of 200 first-year students used the Internet for research or homework. Is the proportion of first-year students who used the Internet for ...
Wednesday, October 9, 2013 at 10:29pm

statistics
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not? how can i write this in a mathematical expression?
Wednesday, October 9, 2013 at 3:51am

Business Statistics
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits. Calculate the mean of the 20 samples Draw a histogram showing the ...
Tuesday, October 8, 2013 at 12:12pm

Statistics
Compute SEdiff Mean1=23 Mean2=18 SD1 =4 SD2 =6 N1 =9 N2 =6
Tuesday, October 8, 2013 at 11:42am

statistics
To see whether people are keeping their car tires inflated to the correct level of 35 pounds per square inch (psi), a tire company manager selects a sample of 36 tires and checks the pressure. The mean of the sample is 33.5 psi, and the population standard deviation is 3 psi. ...
Monday, October 7, 2013 at 8:31pm

Statistics
An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 25.9 years of age. If the standard deviation is assumed to be 4.3 years, find the probability that a random sample of 32 U.S. women would show a mean age at ...
Monday, October 7, 2013 at 5:39pm

Statistics
How do I find the deviation of each x-value from the expected value of 0.97? The chart looks like this... x P(x) x-u 0 0.24 ? 1 0.55 ? 2 0.21 ?
Sunday, October 6, 2013 at 8:53pm

Statistics
A manufacturer ship toasters in cartons of 10. In each carton, they estimate a 20% chance that one of the toasters will need to be sent back for minor repairs. What is the probability, that in one carton there will be 5 toasters that need repair? I have no idea on where to ...
Saturday, October 5, 2013 at 5:20pm

Statistics
A small software company bids on two contracts. It anticipates a profit of $60,000 if it gets the larger contract and $25,000 if it gets the smaller contract. The company estimates that there is a 32% chance it will get the larger contract and a 62% chance it will get the ...
Saturday, October 5, 2013 at 5:17pm

Statistics
1. A simple random sample of FICO credit rating scores is listed below: 714 751 664 789 818 779 698 836 753 834 693 802 a. Find range, variance, and standard deviation. b. As of this writing, the mean FICO score was reported to be 678. Based on these results, is a FICO score ...
Saturday, October 5, 2013 at 3:55pm

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