Thursday

October 2, 2014

October 2, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**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*

**Statistics**

You are dealt a hand of three cards, one at a time. Find the probability that your third card is your first jack. A) 0.068 B) 0.145 C) 0.127 D) 0.077 E) 0.00018 How do I set this problem up?
*Saturday, October 5, 2013 at 9:28am*

**Statistics**

In an Intro Stats class, 57% of students eat breakfast in the morning and 80% of students floss their teeth. Forty-six percent of students eat breakfast and also floss their teeth. What is the probability that a student from this class eats breakfast given they floss their ...
*Friday, October 4, 2013 at 7:58pm*

**Statistics**

You are dealt a hand of three cards, one at a time. Find the probability that your third card is your first jack. A) 0.068 B) 0.145 C) 0.127 D) 0.077 E) 0.00018
*Friday, October 4, 2013 at 7:54pm*

**Statistics**

The American Academy of Pediatrics (AAP) recommends that kids 2-5 years old watch no more than (on average) 1.6 hours a day of quality programming. A researcher selected a sample of 101 kids in the neighborhood and asked their parents how many hours per day they allow their ...
*Friday, October 4, 2013 at 12:32pm*

**Statistics**

1.The average number of acts of physical violence in a random sample of 150 TV movies was 4.5 acts with a standard deviation of 0.75. At the 95% confidence interval level, what is your estimation of the mean range of all movies shown in the television? Explain the result in ...
*Friday, October 4, 2013 at 12:31pm*

**statistics**

2. The National polling organization conducted a phone survey of 850 American adults on what they considered to be the most serious problem facing nation’s public schools; 30% said violence. This sample percent is an estimate of the percent of all adults who think that ...
*Friday, October 4, 2013 at 12:30pm*

**statistics**

Use the normal dist to approx the desired prob. Find the prob of getting at most 30 fives in 200 tosses of a fair 6 sided die
*Friday, October 4, 2013 at 10:20am*

**statistics**

An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 25.6 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 30 U.S. women would show a mean age at ...
*Friday, October 4, 2013 at 1:32am*

**Statistics**

A package of self-sticking notepads contains 6 yellow, 6 blue, 6 green, and 6 pink notepads. An experiment consists of randomly selecting one of the notepads and recording its color. Find the probability that a green notepad is selected given that it is either blue or green. A...
*Thursday, October 3, 2013 at 8:09pm*

**Statistics**

In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question "Have you ever used cocaine?" in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the results of this ...
*Wednesday, October 2, 2013 at 7:24pm*

**Statistics**

In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question "Have you ever used cocaine?" in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the results of this ...
*Wednesday, October 2, 2013 at 6:49pm*

**Statistics**

In an Intro Stats class, 57% of students eat breakfast in the morning and 80% of students floss their teeth. Forty-six percent of students eat breakfast and also floss their teeth. What is the probability that a student from this class flosses his/her teeth given they eat ...
*Tuesday, October 1, 2013 at 7:59pm*

**Statistics**

The soccer team's shirts have arrived in a big box and people start grabbing them. The box contains 7 medium, 12 Large, and 11 extra-large shirts. What is the probability that the first 4 shirts are all extra large? I have been struggling with the problem for an hour and ...
*Tuesday, October 1, 2013 at 7:06pm*

**College Statistics**

Suppose we want to model the number of rats captured in a single trap in a day, where the average number caught is 5 (i.e. X ∼ Poi(5)). (a) What is the probability of catching 6 rats in one trap in a day? (b) What is the probability of catching 12 rats in 2 traps in a ...
*Monday, September 30, 2013 at 9:09pm*

**College Statistics**

For X ∼ Bin(n, p), show that E(X) = np and Var(X) = np(1 − p) Our book defines this as true, but I don't know how to actually prove it.
*Monday, September 30, 2013 at 9:07pm*

**Statistics (Reiny)**

1. A consumer organization estimates that 30% of the households in a particular community have one television set, 39% have two sets, and 20% have three or more sets. What is the probability that a household chosen at random does not have two sets? A) 0.39 B) 0.80 C) 0.61 D) 0...
*Monday, September 30, 2013 at 7:51pm*

**Statistics**

Ricardo's car rental offers five different types of vehicles, compact cars (CC), midsize cars (MC), sport utility vehicles (SUV), vans (V), and luxury cars (L). Historically, if a random individual comes to rent a vehicle, the following probabilities apply: P(CC) = 0.16 P(...
*Monday, September 30, 2013 at 2:35pm*

**math **

find an advertisement for a weight loss product either online or in the print media, the more unbelievable the claims, the better a. What data does it offer for its promised benefits? Does it offer any descriptive statistics or merely testimonials? if it offers descriptive ...
*Monday, September 30, 2013 at 10:25am*

**Statistics **

1. A human gene carries a certain disease from a mother to her child with a probability rate of 0.58. That is, there is a 58% chance that the child becomes infected with the disease. Suppose a female carrier of the gene has five children. Assume that the infections, or lack ...
*Sunday, September 29, 2013 at 10:52pm*

**Statistics**

1. In a certain game, the probability of getting a red outcome is 0.03. Find the probability of getting an outcome that is not red? The answer must be in a decimal. I put 0.97 as the answer ( 1-0.03=0.97) 2. The instructor in a Humanities class says that students have a 15% ...
*Sunday, September 29, 2013 at 7:27pm*

**Probability and Statistics (Continuation)**

Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth trial? MY answers: a) P...
*Sunday, September 29, 2013 at 1:10pm*

**Probability and Statistics**

Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth trial? MY answers: a) P...
*Sunday, September 29, 2013 at 3:12am*

**Probability and Statistics**

An oil prospector will drill a succession of holes in a given area to find a productive well. The probability that he is successful on a given trial is 0.2. a) What's the probability that that the third hole drilled is the first to yield a productive well? b) If the ...
*Sunday, September 29, 2013 at 3:06am*

**statistics,math**

Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection. Be very specific in your presentation
*Sunday, September 29, 2013 at 1:06am*

**Reading Honors**

is this a good essay. please help me on words that will make the essay better, advice if any sentence is wrong. and anything that can make the essay sound more mature/professional than what it is, punctuation, capitalization, clarity, etc. A good argument is convincing, ...
*Saturday, September 28, 2013 at 9:30am*

**statistics**

A Social service agency plans to conduct a survey to determine the mean income of its clients. The director of the agency prefers that you measure the mean income very accurately, to within plus or minus $500. from a sample taken 2 years ago, you estimate that the standard ...
*Friday, September 27, 2013 at 9:01pm*

**statistics**

Calculate the difference between the means distribution parameters? where n1=25,n2=36, s2 1 = 50, s 2 2 = 72, M1= 100, & M2 = 105
*Friday, September 27, 2013 at 8:06pm*

**statistics**

. The average age at which a woman gets married in the U.S. is µ = 27 with a standard deviation of σ = 5.5. Use this information to answer the following questions. Show Your Work! A. What proportion marries at age 30 or more?
*Friday, September 27, 2013 at 7:40pm*

**statistics**

The typical amount of sleep per night for undergraduate college students has a bell shaped distribution with a mean of 7 and a standard deviation of 1.90 hours. Based on this distributional information we can conclude that at least 95 % of this population sleep ...
*Friday, September 27, 2013 at 5:46pm*

**ms.sue please help!!!**

Ms. Sue is this a good essay. please help me on words that will make the essay better, advice if any sentence is wrong. and anything that can make the essay sound more mature/professional than what it is, punctuation, capitalization, clarity, etc. A good argument is convincing...
*Friday, September 27, 2013 at 5:24pm*

**statistics**

An employee currently earning $13.65 per hour has been awarded a 3.5 merit raise. what is the employee hourly salary be with this increase.
*Friday, September 27, 2013 at 3:30pm*

**statistics**

Most Americans, 75% in fact, say frequent handwashing is the best way to fend off the flu. Despite that, when using public restrooms, women wash their hands only 67% of the time and men wash only 46% of the time. Of the adults using the public restroom at a large grocery chain...
*Thursday, September 26, 2013 at 4:51pm*

**statistics - conditional probability**

Event A has probability 0.9 of occurring. Event B has 0.2 chance of occurring if, and only if, event A has occurred. What is the overall probability that event B will occur? I'm so confused. This seems so simple, I'm not sure why I can't reason through it. They'...
*Wednesday, September 25, 2013 at 10:20pm*

**statistics - conditional probability**

Event A has probability 0.9 of occurring. Event B has 0.2 chance of occurring if, and only if, event A has occurred. What is the overall probability that event B will occur? I'm so confused. This seems so simple, I'm not sure why I can't reason through it. They'...
*Wednesday, September 25, 2013 at 10:19pm*

**statistics**

A set of final exam scores in an organic chemistry course was found to be normally distributed, with a mean of 73 and a standard deviation of 8. What is the probability of getting a score higher than 71 on this exam?
*Tuesday, September 24, 2013 at 10:51pm*

**statistics**

A popular retail store knows that the purchase amounts by its customers is a random variable that follows a normal distribution with a mean of $30 and a standard deviation of $9. What is the probability that a randomly selected customer will spend between $20 and $35 at this ...
*Tuesday, September 24, 2013 at 10:47pm*

**statistics**

air coin is flipped 20 times. a. Determine the probability that the coin comes up tails exactly 15 times. b. Find the probability that the coin comes up tails at least 15 times. c. Find the mean and standard deviation for the random variable X giving the number of tails in ...
*Monday, September 23, 2013 at 9:19pm*

**statistics**

suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 and a standard deviation of 0.43. Using the empirical rule, what percentage of students have grade point averages that are between 1.26 and 3.84
*Monday, September 23, 2013 at 9:10pm*

**Statistics**

Which of the following is not a source of caution in regression analysis between two variables? A) non-linear form. B) linear form. C) a lurking variable. D) an outlier. E) extrapolation. E?
*Sunday, September 22, 2013 at 3:39pm*

**Statistics**

Find the variance for the set of data: 24, 31, 16, 22,22.
*Sunday, September 22, 2013 at 3:39pm*

**question**

is it better to take physics or chemistry if taking both whats better to take 1st in sophomore year better to take ap statistics or precalculas for becoming an architect
*Sunday, September 22, 2013 at 1:05pm*

**Statistics**

2. A researcher hypothesized that the pulse rates of long-distance athletes differ from those of other athletes. He believed that the runners’ pulses would be slower. He obtained a random sample of 10 long-distance runners. He measured their resting pulses. Their pulses ...
*Saturday, September 21, 2013 at 1:59pm*

**statistics**

if anxiety scores were recorded as Z score or 1.10, is that higher than 35 in the current study?
*Saturday, September 21, 2013 at 1:31pm*

**statistics**

if a toaster ovens hav an average life expectancy of 9.5 years with a standard deviation of 4.75 years. what is the probability that a toaster oven will last twenty years or will fail in one year or less?
*Saturday, September 21, 2013 at 12:36pm*

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