Thursday

May 28, 2015

May 28, 2015

**statistics**

Discuss the effect that the confidence level has upon the confidence interval.
*Thursday, November 20, 2014 at 10:24pm*

**Business statistics **

Hello, I'm struggling trying to find the answer for b. Do you know the answer and help would greatly be appreciated! A clean air standard required that vehicle exhaust emissions not exceed specified limits for various pollutants. Many states require that cars be tested ...
*Thursday, November 20, 2014 at 5:19pm*

**Math**

You are the coding Supervisor of a medium sized community hospital. You are staffed with 2 inpatient coders. Your current productivity level for your coders is 3 charts per hour. Your hospital discharges has increased to an average of 75 charts per day. How many staff members ...
*Thursday, November 20, 2014 at 3:25pm*

**Psychology Statistics**

Many animals, including humans, tend to avoid direct eye contact and even patterns that look like eyes. Some insects, including moths, have evolved eye-spot patterns on their wings to help ward off predators. Scaife (1976) reports a study examining how eye-spot patterns affect...
*Thursday, November 20, 2014 at 12:43pm*

**Please help me with statistics**

I was asked to: Calculate the d value or effect size for A but use this data instead. A. Group one 12 and group two 11 standard deviation 3 Can anyone please help me figure out how to find the d value. Any help would be great.
*Thursday, November 20, 2014 at 12:49am*

**statistics**

The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. Which portion of the bell curve relates to the answer? What is the % scored? what % of ...
*Tuesday, November 18, 2014 at 4:19pm*

**statistics**

suppose that 70% of all college students love math. in a random sample of 8 college students, let x be the number of students who love math.find p(x=6)
*Tuesday, November 18, 2014 at 1:19pm*

**statistics**

b. A mobile company XYZ wants to conduct a survey to find the proportion P of those customers that are happy with the purchase of their new mobile phone. The company took a random sample of 1000 customers who recently purchased the new mobile phone. They found that among those...
*Tuesday, November 18, 2014 at 12:40am*

**statistics**

you currently lease scanning equipment at a cost of 1,500 per quarter and two copy machines at $120 each per month. What will you need to budget annually for this leased equipment?
*Sunday, November 16, 2014 at 11:29pm*

**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?
*Sunday, November 16, 2014 at 11:18pm*

**statistics**

The 95 percent confidence interval about a mean difference was -3.0 minutes to 6.5 minutes. The null hypothesis that the two population means are equal
*Sunday, November 16, 2014 at 10:17pm*

**statistics**

The same supervisor in the scenario above agreed to increase the salary of the employee to $15.00 per hour once she passed her RHIT exam. three months after beginning her employment, the employee passed her RHIT exam, What will the new budget be for salary and fringe benefits?
*Sunday, November 16, 2014 at 9:53pm*

**statistics**

The HIM coding 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 employees salary. How much must the supervisor budget for the ...
*Sunday, November 16, 2014 at 9:42pm*

**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?
*Sunday, November 16, 2014 at 9:11pm*

**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?
*Sunday, November 16, 2014 at 9:06pm*

**statistics**

After one month of operation, the health information services at Community Health Center determined that there were two records misfiled out of the 450 active records. What is the filing accuracy rate for this area?
*Sunday, November 16, 2014 at 8:57pm*

**statistics**

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal, October 12, 2012). A ...
*Sunday, November 16, 2014 at 8:55pm*

**Statistics**

Community Health Center, a new patient clinic in your town serving only underinsured and uninsured patients, has asked you to help its HIM department get started. Calculate the number of new shelving units needed for a medical record filing system based on eight shelves per ...
*Sunday, November 16, 2014 at 8:51pm*

**statistics**

if your HIM department has 100,000 active records and you received 5,352 requests for records within a six-month period, what is the request rate for the past six months?
*Sunday, November 16, 2014 at 8:38pm*

**statistics **

How many ways can the sequence ANNV be arranged
*Sunday, November 16, 2014 at 4:27pm*

**statistics**

A Coach found the correlation between physical fitness and athletic ability to be r=.65. the mean and standard deviation of the physical fitness test was 330, 50. the mean and standard deviation of the athletic ability test was 9, 2. If you have a physical fitness score of 350...
*Sunday, November 16, 2014 at 1:46pm*

**statistics**

It seems that people are choosing or finding it necessary to work later in life. Random samples of 200 men and 200 women age 65 or older were selected, and 80 men and 59 women were found to be working. At á = 0.01, can it be concluded that the proportions are different
*Saturday, November 15, 2014 at 9:01pm*

**statistics**

Let X be a Binomial random variable with parameters n and 0 < p < 1. Show that lim E(1 + X) · E(1/1 + X)= 1. n→∞
*Saturday, November 15, 2014 at 1:19pm*

**statistics**

Let X be a Binomial random variable with parameters n and 0 < p < 1. Show that lim E(1+X)·E(1+X)·E(1/1+X)=1. n→∞
*Saturday, November 15, 2014 at 1:15pm*

**statistics**

The following table shows the summary statistic of the cholesterol levels of two groups of men in 2014. From 25 to 40 years old, the mean is 224, standard deviation is 5.5 and the sample size is 12. From 41 to 55 years old, the mean is 230, standard deviation is 7 and the ...
*Saturday, November 15, 2014 at 11:58am*

**statistics**

I do not understand this. Can you please explain it to me and how I am suppose to get the answer? Find the probability that a data value picked at random from a normally distributed population will have a standard score that corresponds to the following: Less than 3.00 Thank you
*Friday, November 14, 2014 at 11:13pm*

**Statistics**

Suppose that the probability that a new medication will cause a bad side effect is 0.03. If this medication is given to 150 people, what is the probability that more than three of them will experience a bad side effect?
*Friday, November 14, 2014 at 2:40pm*

**statistics**

Suppose a restaurant in town serves three fixed price dinners costing $12, $15, and $20. For a randomly selected couple ( Penny = X and Leonard= Y), the joint probability table for their selections is given below. Y p(x,y) 12 15 20 12 .05 .05 .10 15 .05 .10 .35 20 0 .20 .10 a...
*Friday, November 14, 2014 at 9:34am*

**statistics **

You want to set up a games stall at the Winter Wonderland. You have a single pack of 52 cards and decide to play card games with your customers. The game is designed as follows. A customer draws 4 cards at random. For every “Ace” that the customer draws, he/she wins...
*Thursday, November 13, 2014 at 12:56pm*

**statistics **

A researcher finds that two continuous, random variables of interest, X and Y, have a joint probability density function (pdf) given by: f(x,y)={cxy 0<=x<=1,0<=y<=1,x+y=>1, .........0 otherwise where c is a constant. (i) Find the value of c so that f(x,y) ...
*Thursday, November 13, 2014 at 12:55pm*

**statistics **

A researcher finds that two continuous, random variables of interest, X and Y, have a joint probability density function (pdf) given by: f(x,y)={cxy 0<=x<=1,0<=y<=1,x+y=>1, .........0 otherwise where c is a constant. (i) Find the value of c so that f(x,y) ...
*Thursday, November 13, 2014 at 10:48am*

**statistics **

You want to set up a games stall at the Winter Wonderland. You have a single pack of 52 cards and decide to play card games with your customers. The game is designed as follows. A customer draws 4 cards at random. For every “Ace” that the customer draws, he/she wins...
*Thursday, November 13, 2014 at 10:44am*

**statistics**

A professor who teaches a number of courses is choosing a team of 4 boys and 3 girls from among his graduate students to help with the setup of the labs in his courses. He has 12 graduate students of 6 boys and 6 girls. Assuming that the order of students does not matter, in ...
*Thursday, November 13, 2014 at 10:05am*

**statistics question**

Thank you in advance for anyone able to help me with this... In a sample of 67 randomly selected students, 27 favored the amount being budgeted for next year's intramural and interscholastic sports. Construct a 98% confidence interval for the proportion of all students who...
*Wednesday, November 12, 2014 at 11:35pm*

**Help With Statistics**

I would really appreciate help with this. In a survey of 1000 large corporations, 252 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job. Find a 0.95 confidence interval for p. (Round your answers to...
*Wednesday, November 12, 2014 at 11:34pm*

**Statistics Help!**

Please help! In a combined study of northern pike, cutthroat trout, rainbow trout, and lake trout, it was found that 22 out of 845 fish died when caught and released using barbless hooks on flies or lures. All hooks were removed from the fish. Let p represent the proportion of...
*Wednesday, November 12, 2014 at 11:32pm*

**STATISTICS**

How can I solve this? A random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for p, how many medical files should you include in a random sample in order to be 85% sure that the point ...
*Wednesday, November 12, 2014 at 11:31pm*

**statistics**

I have no idea how to solve this. In a sample of 16 students, 15 were right-handed. Can we construct a 95% confidence interval for the proportion of all students who are right-handed?
*Wednesday, November 12, 2014 at 11:29pm*

**statistics**

B} The average number of mosquitoes in a stagnant pond is 70 per square meter with a standard deviation of 8. If 36 square meters are chosen at random for a mosquito count, find the probability that the average of those counts is more than 70.9 mosquitoes per square meter. ...
*Wednesday, November 12, 2014 at 9:49pm*

**statistics**

a jar contains red and blue marbles. two marbles are chosen without replacement. the probability of choosing a red marble and then a blue marble is .26, and the probability of selecting a blue marble first is .43. what is the probability of selecting a red marble on the second...
*Wednesday, November 12, 2014 at 6:55pm*

**statistics**

at the tire store, 10 out of every 100 tires are defective. if your parents randomly choose and purchase 4 new tires for a family vehicle from a set of 100 newly shipped titres, what is the probability that all four will be defective
*Wednesday, November 12, 2014 at 6:54pm*

**statistics**

what is the difference between parameter and statistic
*Wednesday, November 12, 2014 at 9:01am*

**statistics**

=weight of oranges in a 5-lb bag ~ N(m,0.2); (a) How many customers get cheated, if E(X)=5? (proportion p=________?) (b) What should m equal so that (a) p<16%, (b) 2.5%, (c) 0.5% ? (d) If the cost of oranges to the packer is $0.35, what is the respective cost of meeting ...
*Wednesday, November 12, 2014 at 1:04am*

**Statistics**

It is reported that 72% of working women use computers at work. Choose 5 working women at random. Find a. The probability that at least 1 doesn't use a computer at work b. The probability that all 5 use a computer in their jobs
*Tuesday, November 11, 2014 at 1:25pm*

**statistics**

It is known that 10 % of a school's athlete population uses drugs. The Athletic Director gives a drug test which registers correctly as positive in 82 % of the cases where the drug is present and correctly as negative in 96 % of the cases where the drug is absent. One ...
*Monday, November 10, 2014 at 5:40am*

**Statistics**

A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not? I understand that the score in question is 3 standard deviations above the mean. But I thought that I would need to convert this to a...
*Sunday, November 9, 2014 at 9:16pm*

**Statistics**

A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?
*Sunday, November 9, 2014 at 8:04pm*

**Statistics**

In a population, heights of males are normally distributed with u=180 cm and sigma^2=16 cm^2, while the heights of females are normally distributed with u=170 cm and sigma^2= 25 cm^2. a) One random male and one random female are selected from the population i)What is the ...
*Sunday, November 9, 2014 at 7:26pm*

**statistics**

For a certain yes/no survey question, 55% of the respondents answered “yes”. The null hypothesis is that the population is equally divided on this issue (50% yes and 50% no). The sample size is equal to your age. For a ...
*Saturday, November 8, 2014 at 9:30pm*

**Statistics**

About 7% of men in the U.S. have some form of red-green color-blindness. Suppose we randomly select one U.S. adult male at a time until we find one who is red-green color-blind. How many men would we expect to choose, on average? Design and carry out a simulation to answer ...
*Saturday, November 8, 2014 at 3:20pm*

**statistics**

what is the weight between 5.5 to 6 ounce when mean is 5,75 ounce and standard deviation is 0.11
*Friday, November 7, 2014 at 11:58am*

**college statistics **

the math SAT scores for all students who applied to the school of engineering are normally distributed with M=629 and standard deviation of 60. the school of engineering has decided to accept those students whose scores fall in the top 15%. what is th minimum score an appliant...
*Thursday, November 6, 2014 at 6:34pm*

**college statistics**

the average length of time required for students to complete a test in a an introductory statistics course is found to be 50 minutes with a standard deviation of 12 minutes. if students are allowed 80 minutes to complete the test , approximately what percentage of the students...
*Thursday, November 6, 2014 at 6:29pm*

**Math/Statistics**

The number of megapixels in a digital camera is one of the most important factors in determining picture quality. But, do digital cameras with more megapixels cost more? The following data show the number of megapixels and the price ($) for 10 digital cameras (Consumer Reports...
*Thursday, November 6, 2014 at 5:01pm*

**statistics**

Membership in Mensa requires an IQ score above 131.5. Nine candidates take an IQ test and their summary scores indicate that their mean IQ score is 133. IQ scores are normally distributed and have a mean of 100 and a standard deviation of 15. If nine people are randomly ...
*Thursday, November 6, 2014 at 1:17am*

**STATISTICS**

Suppose that, in order to estimate the proportion of students who wear glasses, a sample of 100 students was collected and showed that 20 of the students in the sample wore glasses. A confidence interval for the population proportion of students who wear glasses is given by: ....
*Thursday, November 6, 2014 at 12:03am*

**statistics**

Suppose that the ages of students at a particular university average 26 years with a standard deviation of 2.8 years. Consider the sampling distribution of the sample mean age of students in a sample of n = 49. The standard deviation of the sampling distribution is
*Wednesday, November 5, 2014 at 11:49pm*

**Statistics **

Daily water intake (including water used in drinks such as coffee, tea and juice) for Canadian adults follows a normal distribution with mean 1.5 litres and standard deviation 0.31 litres. (d) Using the 68-95-99.7 Rule, approximately 95% of samples of 22 Canadian adults will ...
*Wednesday, November 5, 2014 at 8:13pm*

**Statistics**

a Rollercoaster's auditors estimate that the average daily loss from those illegally riding without tickets is at lease (greater or equal) $295, but wants to determine the accuracy of this statistic. The company researcher takes a random sample of losses over 64 days and ...
*Wednesday, November 5, 2014 at 7:42pm*

**statistics**

Waiting times at a doctor office are normally distributed with a mean of 35 minutes, and a standard deviation of 10 minutes. 25% of the patients have to wait less than how many minutes?
*Wednesday, November 5, 2014 at 7:13pm*

**statistics**

Suppose you are given data from a survey showing the IQ of each person interviewed and the IQ of his or her mother. That is all the information that you have. Your boss has asked you to put together a report showing the relationship between these two variables. What could you ...
*Wednesday, November 5, 2014 at 4:32pm*

**statistics**

Siegel found that elderly people who owned dogs were less likely to pay visits to their doctors after upsetting events than were those who didn’t own pets. Similarly, consider the following hypothetical data. A sample of elderly dog owners is compared to a similar group (...
*Wednesday, November 5, 2014 at 10:43am*

**statistics**

What would be a nondirectional hypothesis for this statement. Older drivers are safer than younger ones. I have this not sure if it is correct. There will be a difference between older and younger drivers.
*Wednesday, November 5, 2014 at 6:28am*

**statistics**

Waiting times at a doctor office are normally distributed with a mean of 35 minutes, and a standard deviation of 10 minutes. What is the chance a patient would have to wait over 50 minutes?
*Wednesday, November 5, 2014 at 2:26am*

**statistics**

can you explain this to me please? Consider the binomial distribution where n = 11 and p = 0.05. Find the mean and standard deviation of this binomial distribution.
*Wednesday, November 5, 2014 at 1:38am*

**college statistics**

how many ways can a 3 person committee be formed from 12 people
*Wednesday, November 5, 2014 at 12:49am*

**statistics**

A couple considering a mortgage of $100,000 have a choice of loans. One loan is an 8% loan for 20 years, and the other loan is at 8% for 30 years. Find the amount of interest that the couple can save by choosing the 20-year loan.
*Tuesday, November 4, 2014 at 7:36pm*

**statistics**

(1) The director of a health club conducted a survey and found that 23% of members used only the pool for workouts. Based on this information, what is the probability that for a random sample of 10 members, 4 used only the pool for workouts? Round your answer to four decimal ...
*Tuesday, November 4, 2014 at 7:24pm*

**statistics**

The survival rate during a risky operation for patients with no other hope of survival is 81%. What is the probability that exactly four of the next five patients survive this operation?
*Tuesday, November 4, 2014 at 7:22pm*

**Statistics**

Service times for customers at a post office follow some right-skewed distribution with mean 2.91 minutes and standard deviation 1.74 minutes. (a) Can you calculate the probability that the average service time for the next two customers is less than 2.64 minutes? If you can...
*Tuesday, November 4, 2014 at 2:58pm*

**Statistics**

Daily water intake (including water used in drinks such as coffee, tea and juice) for Canadian adults follows a normal distribution with mean 1.86 litres and standard deviation 0.29 litres. (a) Can you calculate the probability that the mean daily water intake for a random ...
*Tuesday, November 4, 2014 at 2:57pm*

**statistics**

I this binomial? or No? A gumball machine contains 25 gumballs - 9 red, 6 blue, 7 green and 3 yellow. You buy five gumballs from the machine. X = number of green gumballs you get
*Tuesday, November 4, 2014 at 1:43pm*

**Statistics **

Random samples of size n = 90 were selected from a binomial population with p = 0.4. Use the normal distribution to approximate the following probabilities. (Round your answers to four decimal places.) (a) P(p̂ ≤ 0.49) = (b) P(0.37 ≤ p̂ ≤ 0.49) = ...
*Monday, November 3, 2014 at 7:41pm*

**statistics**

A random sample of 84 shoppers were interviewed and 51 said they prefer to shop alone rather than with someone else. Let p represent the proportion of all shoppers at this mall who would prefer to shop alone. Find a point estimate (p hat) for p.
*Sunday, November 2, 2014 at 11:46pm*

**Statistics**

a city needs to perform some road maintenance and will rent excavator m achines from a company. Each excavator will work at least 1 hour, but no more than 4 hours at a time. It is known that the working time of each excavator is evenly distributed. a) What is the distribution ...
*Sunday, November 2, 2014 at 10:02pm*

**statistics and probability**

A company manufactures washers, about 5% of which are defective. If a random sample of 100 washers are inspected, what is the probability that fewer than 4 are defective?
*Sunday, November 2, 2014 at 3:07pm*

**statistics**

Suppose that in a large population the proportion of people that have a certain disease is 0.01. Use the Poisson approximation to find the probability that at least four people will have the disease in a group of 400 randomly selected people.
*Sunday, November 2, 2014 at 3:05pm*

**Statistics**

It takes the bus an average of 20 minutes to arrive at a certain bus stop. A student is waiting for the next bus to arrive. a) What is the probability the student waits more than 30 minutes? b) What is the probability the student waits exactly 15 minutes? c) What is the ...
*Sunday, November 2, 2014 at 12:29pm*

**statistics**

31% of a certain breed of rabbits are born with long hair. What is the probability that in a litter of 8 rabbits, exactly 5 will have long hair? (Give your answer correct to three decimal places.)
*Saturday, November 1, 2014 at 8:45pm*

**Statistics**

a Rollercoaster's auditors estimate that the average daily loss from those illegally riding without tickets is at lease (greater or equal) $295, but wants to determine the accuracy of this statistic. The company researcher takes a random sample of losses over 64 days and ...
*Saturday, November 1, 2014 at 6:54pm*

**Statistics**

I have all the data, I just need someone to tell me how to start xc Please! I've been working on this for 5 hours now! 8. Calculate the equation of the least squares regression line. Draw this line on your scatter plot. The point (x,y) should lie on the line. Does it? Plot...
*Saturday, November 1, 2014 at 5:44pm*

**Statistics**

We're doing a project. I have all my data, but I'm not sure about what this is asking for. Use your regression equation to determine the purchase price for the 1999 Jeep Grand Cherokee. How does the predicted value, ŷ, compare to the average selling price, y, of ...
*Saturday, November 1, 2014 at 2:29pm*

**Statistics**

a. What is the probability that a sample of 50 male graduates will provide a sample mean within $.50 of the population mean, $21.68? b. What is the probability that a sample of 50 female graduates will provide a sample mean within $.50 of the population mean, $18.80? d. What ...
*Saturday, November 1, 2014 at 2:24pm*

**statistics**

Can you step by srep dumb this down so that I can understand how to get the answer please? A set of 50 data values has a mean of 15 and a variance of 36. Find the standard score of a data value = 21
*Friday, October 31, 2014 at 4:39pm*

**statistics**

The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 37 and a standard deviation of 3. Using the empirical rule (as presented...
*Friday, October 31, 2014 at 12:22pm*

**statistics**

can you please explain the following so that I can understand how the numbers for each part was found: A set of 50 data values has a mean of 15 and a varience of 36. Find the standard score (z score) of a data value =21
*Thursday, October 30, 2014 at 11:08pm*

**Statistics**

Carrie attained a score of 650 on the verbal section of her SAT. The mean grade was a 500 with a standard deviation of 100. What percentage of test takers scored below and above Carrie?
*Thursday, October 30, 2014 at 8:33pm*

**statistics**

Assume that the readings on the thermometers are normally distributed with a mean of 0 degrees and standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. Draw a sketch and find the temperature reading corresponding to p subscript 99, the ...
*Thursday, October 30, 2014 at 7:42pm*

**Statistics **

Where can I find the ti83 plus input functions for beginning statistics course
*Thursday, October 30, 2014 at 2:55pm*

**statistics**

The tread life a certain brand of tires is known to be normally distributed with a mean of 60,000 miles and a standard deviation of 5,000 miles. The company wishes to set the warranty so that only 4% of the tires will need to be replaced. What should the warranty mileage be?
*Thursday, October 30, 2014 at 1:08am*

**statistics**

A company wishes to make 1 ounce candy bars. According to government regulations, in order to label the candy bars as 1 ounce, at least 95 % of the bars must weigh 1 ounce or more. Our process standard deviation is .08 ounces. What do we need to make the mean weight be so that...
*Thursday, October 30, 2014 at 1:08am*

**statistics**

For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...
*Thursday, October 30, 2014 at 1:08am*

**Bio-Statistics**

Do you have any experience working with SPSS format
*Wednesday, October 29, 2014 at 9:44pm*

**statistics**

. For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...
*Wednesday, October 29, 2014 at 8:01pm*

**statistics**

A company wishes to make 1 ounce candy bars. According to government regulations, in order to label the candy bars as 1 ounce, at least 95 % of the bars must weigh 1 ounce or more. Our process standard deviation is .08 ounces. What do we need to make the mean weight be so that...
*Wednesday, October 29, 2014 at 8:00pm*

**statistics**

The tread life a certain brand of tires is known to be normally distributed with a mean of 60,000 miles and a standard deviation of 5,000 miles. The company wishes to set the warranty so that only 4% of the tires will need to be replaced. What should the warranty mileage be?
*Wednesday, October 29, 2014 at 8:00pm*

**statistics**

If the mean I.Q. is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will have a z score (or standard score) of?
*Wednesday, October 29, 2014 at 5:56pm*

**Statistics**

Recent shootings in the united states of unarmed male african american by law enforcement officers has prompt renewed interest in racial inequality. Design a 10 questionaire that you believe could be used to access this problem. How to approach this questionnaire?
*Wednesday, October 29, 2014 at 3:45pm*

**statistics**

Suppose that the amount of time it takes the IRS to refund to taxpayers is normally distributed with a mean of 12 weeks and a variance of 9. a. What percent of taxpayers should get a refund within 5 weeks? b. What percent of taxpayers will get their refund within 10-15 weeks? ...
*Tuesday, October 28, 2014 at 2:30pm*

**Math: Statistics**

1. A regression analysis includes the effect of Age, which is categorised into five levels. How many dummy variables should be defined for including it in the analysis? 2. A regression analysis includes Sex as an explanatory variable. How many dummy variables are required to ...
*Tuesday, October 28, 2014 at 1:22pm*