Monday

May 4, 2015

May 4, 2015

**statistics**

An airline company is considering a new policy of booking as many as 161 persons on an airplane that can seat only 140. (Past studies have revealed that only 81% of the booked passengers actually arrive for the flight.) Estimate the probability that if the company books 161 ...
*Thursday, March 27, 2014 at 8:51pm*

**Statistics**

The following are the weekly amounts of welfare payments made by the federal government to a sample of six families: $143, $138, $132, $136, $145 and $136. What is the range? $24 $9 $13 $0
*Thursday, March 27, 2014 at 8:49pm*

**Economics and Statistics**

A stockbroker placed the following order for a customer: • 50 shares of Kaiser Aluminum preferred at $100 a share • 100 shares of GTE preferred at $27.20 a share • 20 shares of Boston Edison preferred at $12.20 a share What is the weighted arithmetic mean price ...
*Thursday, March 27, 2014 at 8:07pm*

**Business Statistics**

What is the median of 29, 49, 27, 64, 79, 59, 29 and 41? 29.0 45.0 59.5 49.0
*Thursday, March 27, 2014 at 5:02pm*

**statistics**

A committee consists of five men and four women. Two people are selected at random from the committee. What is the probability that one man and one woman will be selected?
*Thursday, March 27, 2014 at 11:13am*

**Statistics**

A population has a standard deviation of 15.2. How large a sample must be drawn so that a 95% confidence interval for the population mean will have a margin error equal to 3.5?
*Wednesday, March 26, 2014 at 9:37pm*

**`Statistics**

A public relations firm found only 9% of voters in a certain state are satisfied with their US senators. How large a sample of voters should be drawn so that the sample proportion of voters who are satisfied with their senators is approximately normally distributed?
*Wednesday, March 26, 2014 at 9:36pm*

**statistics**

If there are 18 blue socks and 24 black socks what is the probability of pulling out 2 black socks?
*Wednesday, March 26, 2014 at 5:39pm*

**Math-Statistics**

Assume you build a Candy castle for which you buy a bag of gummy bears, a block of chocolate and a bag of nuts. The weight of the three ingredients is a random variable (X1, X2 and X3) with mean weights μ1 = 200 gram, μ2 = 400 gram and μ3 = 150 gram. The bags ...
*Monday, March 24, 2014 at 7:26pm*

**Math-Statistics**

The chance that a college student has a job offer before graduation is 70%. If I sample 200 graduates… (use continuity correction) a) what is the chance more than 130 of them have a job offer? b) what is the chance less than 133 of them have a job offer? c) what is the ...
*Monday, March 24, 2014 at 7:25pm*

**Math-Statistics**

5) You know that you will inherit 20% of your uncle John’s wealth, 30% of your aunt Becky’s wealth and 50% of your parent’s wealth. Since they are not dead yet, their respective wealth is a RV and all we know is that their wealth at death is ~N and independent ...
*Monday, March 24, 2014 at 7:25pm*

**Math-Statistics**

Assume your expected lifetime income is $1.5 million and the standard deviation is $250,000. a) What is the chance that you will earn more than $1.1 million during your lifetime? b) What is the chance that you will earn less than $2 million during your lifetime? c) What is the...
*Monday, March 24, 2014 at 7:23pm*

**Speech- Statistic needed**

Does anyone know of any websites that have statistics on the number of people that volunteer for disaster relief in the us?
*Monday, March 24, 2014 at 12:13pm*

**statistics**

help i do not understand how to solve this question: assume that blood pressure readings are normally distributed with a mean of 111 and standard deviation of 7. A researcher wishes to select people for a study but wants to exclude the top and bottom 10 percent. What would be ...
*Monday, March 24, 2014 at 11:31am*

**Statistics **

Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 95% ...
*Monday, March 24, 2014 at 8:34am*

**statistics**

assume that blood pressure readings are normally distributed with a mean of 111 and standard deviation of 7. A researcher wishes to select people for a study but wants to exclude the top and bottom 10 percent. What would be the upper and lower readings to qualify people to ...
*Monday, March 24, 2014 at 2:59am*

**Statistics**

The following is a list of 13 measurements: -38,-89,-47,-43,-70,59,92,97,23,-11,-62,-22,-5. Suppose that these measurements are respectively labeled X1,X2,...,X13 Find the sum when i=1 Xi/30.
*Sunday, March 23, 2014 at 6:55pm*

**Statistics**

)The random sample shown below was selected from a normal distribution Complete parts (a) and (b). Construct a 99% confidence interval for the population mean u. Round to two decimal places as needed.
*Sunday, March 23, 2014 at 9:34am*

**Statistics**

A random sample of 90 observations produced a mean that = 25.9 and a standard deviation s =2.4 (a)Find a 95% confidence interval for u (b)Find a 90% confidence interval for u (c)Find a 99% confidence interval for u (Use integers or decimals for any number in the expression. ...
*Sunday, March 23, 2014 at 9:30am*

**statistics**

(12) Suppose N – 60,000, n =15,000, and s =50 (a) compute the standard error of mean (x) using the finite population correction factor (b) Repeat part a assuming n =30,000 (c)Repeat part a assuming n = 60,000 (d)Compare parts (a), (b), and (c), and describe what happens ...
*Sunday, March 23, 2014 at 9:25am*

**statistics**

5. Suppose a manufacturer of computer chips is experiencing an average of 2% defective chips. (a) If a lot contains 1000 chips, what is the probability that more than 25 chips are defective? HINT. Use the normal approximation to the binomial.
*Sunday, March 23, 2014 at 12:35am*

**statistics**

The highest point in the scatter is the point for Illinois, at 1807. The two just below it, at 1778 and 1777, are for Minnesota and Iowa. The lowest points are at 1391 and 1385, for Maine and D.C. respectively. Pick all the options that are correct. The scatter diagram shows ...
*Saturday, March 22, 2014 at 3:47pm*

**statistics**

opinion polls find that 16 percent of americans adults claim that they never have time to relax. suppose you take a random sample of 400 american adults and count the number X in your sample and claim that they never never have time to relax.
*Saturday, March 22, 2014 at 12:02pm*

**statistics**

Consider a binomial experiment with 20 trials and a probability of 0.45 on a single trial.Use the normal distribution to find the probability of exactly 10 successes.
*Friday, March 21, 2014 at 10:18pm*

**statistics**

Suppose the average body temp is 98.6 assume the variable is normally distributed with a standard deviation of .74 degrees. suppose a sample of 100 is taken. what is the probability that the mean is below 98.4??? Between 98.5 AND 98.7??
*Friday, March 21, 2014 at 7:28pm*

**statistics**

the average act score submitted to a certain university is 26. to be eligible for admission, a student must score in the top 6% of applicants. if the scores are normally distributed with a standard deviation of 2.4, what is the minimum score needed to be considered for admission?
*Friday, March 21, 2014 at 7:25pm*

**Statistics**

An instructor hy pothesizes that the mean of the final ex am grades in her statistics class is larger for the male students than that it is for the female students. The data from the final ex am for the last semester are presented here. Test her claim using = 0.05. ...
*Friday, March 21, 2014 at 8:27am*

**Statistics **

1. A sports researcher gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows: Eating Habits Scores Baseball Players Football Players Basketball Players 34 27 35 18 28 ...
*Thursday, March 20, 2014 at 4:20pm*

**statistics**

From experience, an airline knows that only 80% of the passengers booked for a certain flight actually show up. If 8 passengers are randomly selected, find the probability that fewer than 7 of them show up.
*Thursday, March 20, 2014 at 11:57am*

**Math: Statistics Least squares line**

Find an equation of the least squares line, then use it to complete the table. X- 111 169 230 287 335 ? Y- 2 3 4 5 6 7 Extrapolation I missed the lesson on this and as far as I can tell I think the least squares line is y= .01764x+ .oo693 If anyone could verify my line and and...
*Wednesday, March 19, 2014 at 11:59pm*

**statistics**

If boys and girls are equally likely and groups 400 births are randomly selected find the standard deviation
*Wednesday, March 19, 2014 at 11:19pm*

**statistics**

Find z such that 7.1% of the standard normal curve lies to the left of z ?
*Wednesday, March 19, 2014 at 10:47pm*

**Statistics PLEASE HELP FINAL IN 1 HOUR**

Is a new hair shampoo product actually effective? Ask participants to grade themselves on scale of 1-10 how attractive their hair is both before and after using a shampoo product after 2 weeks Results Subject Initial Rating (A) Rating After 2 Weeks (B) 1 1 5 2 2 3 3 5 5 4 3 7 ...
*Wednesday, March 19, 2014 at 2:24pm*

**statistics**

99% of men scored between -52.68 ,64.64 where did 95% of the values for weight relative to the ideal lie?
*Wednesday, March 19, 2014 at 1:43pm*

**Statistics **

A random sample of 150 towns in a western state had a mean annual precipitation of 2.86 inches. Assume that the population standard deviation is known to be 0.78 inches. Compute the 95% confidence interval for μ.
*Wednesday, March 19, 2014 at 2:45am*

**statistics**

Find the critical value for the hypothesis test, given the following. (Give your answer correct to two decimal places.) Ha: ó1 > ó2, with n1 = 7, n2 = 16, and á = 0.05 F=?
*Tuesday, March 18, 2014 at 8:19pm*

**statistics**

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" was the ...
*Tuesday, March 18, 2014 at 8:18pm*

**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 n=384 x=314 H n=423 x=329
*Tuesday, March 18, 2014 at 7:45pm*

**statistics**

Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If Smith checks 300 of the 7500 welds completed that shift, what is the probability that he will find ...
*Tuesday, March 18, 2014 at 4:35pm*

**statistics**

You have an SRS of 15 observations from a Normally distributed population. What critical value would you use to obtain a 98% confidence interval for the mean μ of the population? I know the answer is 2.602...but I do not understand why Tell me if I'm wrong: n=15 ...
*Tuesday, March 18, 2014 at 1:34pm*

**help ms sue lang arts**

For Questions 1–6, read the play excerpt below and answer the questions that follow. Jaws of the Water ACT TWO At rise we see DAD, TINA, and MARK rushing in and out of the living room. Each enters carrying important items—such as sleeping bags, rain gear, and ...
*Monday, March 17, 2014 at 7:04pm*

**Statistics**

Determine the minimum sample size required in order to be 95% confident that our estimate is within 4% of the true percent of all US households using e-mail. Assume no prior estimate available.
*Monday, March 17, 2014 at 7:01pm*

**statistics**

a resturant must choose 5 employees from 12 applicants. in how many ways can they do that?
*Monday, March 17, 2014 at 5:43pm*

**statistics**

a machine has 0.04 probability of producing a defective item. If it produces 6 items find: a. probability none is defective b. at least one is defective c. all are defective
*Monday, March 17, 2014 at 5:41pm*

**statistics**

a quiz had 6 questions, each with 4 possible answers (only one of which is correct). If you answer them at random, find the probability that all are correct and at least one is wrong.
*Monday, March 17, 2014 at 3:12pm*

**statistics**

A clinical trial test a method designed to increase probability of conceiving a girl.In study 375 were born and 300 were girls Use sample data to construct 99%confidence interval of percentage girls born
*Monday, March 17, 2014 at 12:28pm*

**Statistics**

A standard pack of 52 cards consists of 4 suits, hearts, diamonds, clubs and spades. Each suit has 13 cards, from Ace to King. We deal randomly 5 cards from the deck of 52. 2 deals differing only by the order are considered the same. How many different deals are there? How ...
*Monday, March 17, 2014 at 3:35am*

**Statistics**

Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class.
*Sunday, March 16, 2014 at 1:18am*

**statistics**

A food manufacturer samples 7 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 14.2 oz and the sample standard deviation is 0.60 oz., find the 95% confidence interval of the true mean.
*Sunday, March 16, 2014 at 1:00am*

**statistics**

Canadians are becoming more conscious of the importance of good nutrition, and some researchers believe that we may be altering our diets to include less red meat and more fruits and vegetables. To test this theory, a researcher decides to select hospital nutritional records ...
*Saturday, March 15, 2014 at 3:14am*

**statistics**

Which two scales of measurement always require nonparametric procedures and why?
*Friday, March 14, 2014 at 2:50am*

**probability and statistics**

a multiple choice test onsists of 8 questions, each with 4 possible answers but only one of which is correct.what is the probability that an unprepared student will, by chance, get, a. all correct answers, b. exactly 5 correct answers, c. at most 4 correct answers, d. at most ...
*Wednesday, March 12, 2014 at 5:04am*

**Statistics**

An industrial engineer has found that the standard household light bulbs produced by a certain manufacturer have a useful life that is normally distributed with a mean of 250 hours and a variance of 2500. (a) What is the probability that a randomly selected bulb from this ...
*Tuesday, March 11, 2014 at 10:09am*

**6th grade math - statistics**

Can you explain why Q1 = 3.5 and Q3 is 9 out of this dataset 0, 1, 3, 4, 6, 7, 7, 7, 8, 10, 12, 12. My answers were: Assuming median would be 7 (using numbers in positions 6 and 7 where 7+7/2 = 7) Q1 dataset would be 0,1,3,4,6; Q1 = 3 Q2 dataset would be 7,8,10,12,12; Q3= 10 ...
*Monday, March 10, 2014 at 5:17pm*

**Statistics**

In an experiment, you measure the popularity of two brands of soft drinks (factor A), and for each brand you test males and females (factor B). The following table shows the main effect and cell means from the study: Factor A Level A1: Level A2: Brand X Brand Y Level B1: 14 23...
*Monday, March 10, 2014 at 1:03pm*

**Statistics**

A researcher investigated the effect of volume of background noise on participants’accuracy rates while performing a difficult task. He tested three groups of randomly selected students and obtained the following means and sums of squares: Volume Source Sum of sqs. df ...
*Monday, March 10, 2014 at 11:13am*

**statistics**

1. 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 population of sales people at this national company is 25 with a standard deviation of 4. ...
*Monday, March 10, 2014 at 1:04am*

**Statistics**

What is 0.095 on the z-score table or where
*Sunday, March 9, 2014 at 8:59pm*

**statistics**

Assuming that the distribution is normal for weight relative to the ideal and 99% of the male participants scored between (–53.68, 64.64), where did 95% of the values for weight relative to the ideal lie? R
*Sunday, March 9, 2014 at 4:22pm*

**Statistics**

Put in Binomial Probability Formula? probability ( 2 of 22 are lost) = C(22,2) (1/200)^2 (199/200)^20
*Sunday, March 9, 2014 at 6:59am*

**Statistics**

List five numbers for which the sample mean is 30 and not all numbers are equal and would have a mean of 30 but all numbers are equal
*Sunday, March 9, 2014 at 3:24am*

**Statistics**

How do I plug this into the Binomial Probability Formula? prob(lost) = 5/1000 = 1/200 prob(not lost) = 199/200 prob( 2 of 22 are lost) = C(22,2) (1/200)^2 (199/200)^20 = .005224..
*Sunday, March 9, 2014 at 12:45am*

**Statistics**

Prev Up Next (1 pt) Suppose that in the year 2000, the cost of a compact car averaged $ 12600 and that in 2003, the cost averaged $ 14100. Assuming that the relationship between year t and cost c is linear, develop a formula for predicting the average cost of a compact car in ...
*Saturday, March 8, 2014 at 5:14pm*

**Statistics**

I have 8 marbles: 3 blue, 1 green, 4v reds. What is the probability of selecting a blue marble twice with replacement and twice without replacement
*Saturday, March 8, 2014 at 12:09pm*

**Statistics**

For the z-score mean-SD how do you get the percentage without using a calculator
*Saturday, March 8, 2014 at 11:22am*

**Statistics**

If I don't know the mean and the standard deviation how can I find the area of z-score -0.75
*Saturday, March 8, 2014 at 10:28am*

**Statistics**

If I don't know the mean and the standard deviation how can I find the area of z-score -0.75
*Saturday, March 8, 2014 at 9:06am*

**Statistics **

Consider the standard normal distribution. Find the area for the z-score -0.75. Draw a picture of this distribution showing the location of the z-score and the mean. Shade the region corresponding to the area found for the z-score.
*Saturday, March 8, 2014 at 8:37am*

**Statistics**

In a certain population of clover, the number of flowers on each plant is approximately normally distributed with a mean of 10.8 flowers/plant and a standard deviation of 2.1 flowers/plant. What percentage of the plants fall between 8 and 11 flowers?
*Saturday, March 8, 2014 at 7:09am*

**statistics**

In a random sample of 100 customers, 62 returned with a month. For a 95% confidence interval on the proportion of customers who return for an oil change, the lower limit is:
*Friday, March 7, 2014 at 11:21pm*

**Statistics**

Help please... What are some reason for conducting an experiment with two factors?
*Friday, March 7, 2014 at 3:16pm*

**statistics**

a large shipment of computer chips, of which 5% are actually defective, a quality control manager decides to test chips until he finds the first defective. What is the probability that the manager finds the first defective chip on the first test? in Homework Help
*Friday, March 7, 2014 at 4:04am*

**Statistics**

If the king and queen invite 8 knights and thier wives then how many handshakes will there be if each couple cannot handshake with their lifetime partner. (I think this involves the king and queen as a couple).
*Thursday, March 6, 2014 at 9:55am*

**statistics**

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.
*Wednesday, March 5, 2014 at 11:49am*

**statistics**

A telephone company's records indicate that private customers pay on average $17.10 per month for long-distance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended for long-distance calls and a sample ...
*Wednesday, March 5, 2014 at 11:45am*

**statistics**

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.
*Wednesday, March 5, 2014 at 11:22am*

**statistics**

Conduct an ANOVA comparing participants recall will vary as a function of stress levels. Conduct an ANOVA comparing participants recall at Time 1 across all three stress level conditions (low, medium,and high). Conduct post hoc tests if needed, using the Tukey method.
*Monday, March 3, 2014 at 8:12pm*

**statistics**

Conduct an ANOVA comparing participants recall will vary as a function of stress levels. Conduct an ANOVA comparing participants recall at Time 1 across all three stress level conditions (low, medium, and high). Coduct post hoc tests if needed, using the Tukey method.Write a ...
*Monday, March 3, 2014 at 3:31pm*

**statistics**

On the average five customers visit a children department store each hour. Using Poisson distribution, calculate the probability of three customers shop at the store.
*Monday, March 3, 2014 at 12:17pm*

**statistics**

the average score on the statistics quiz was a 70, and there was a standard deviation of 10 points. If the z-socre was -1.0 what is the percentile rank?
*Sunday, March 2, 2014 at 1:04pm*

**Statistics**

In a certain city of several million people, of the adults are unemployed. If a random sample of adults in this city is selected, approximate the probability that at least in the sample are unemployed. Use the normal approximation to the binomial with a correction for ...
*Saturday, March 1, 2014 at 8:56pm*

**Statistics**

An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Calculate the margin of error, E, for a 99% confidence interval for µ, the average annual ...
*Saturday, March 1, 2014 at 5:26pm*

**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? ...
*Friday, February 28, 2014 at 8:56pm*

**Probability**

Statistics show that about 5% of all males are colorblind. Suppose that 20 males are selected at random. What is the probability that at least 4 of the 20 people are colorblind? My answer: I got 1-0.984 The answer key says 0.00257394
*Friday, February 28, 2014 at 7:49pm*

**statistics**

When calculating a confidence interval for the difference between two means, what information are you gaining? The means are from both same population and different? Thank you.
*Friday, February 28, 2014 at 4:47pm*

**Math (Statistics) **

The SAT scores of a certain population of students are approximately normally distributed with a mean and standard deviation of 1000 and 200 points, respectively. The probability that a student selected at random from the population has an SAT score between 800 and 1200 ...
*Friday, February 28, 2014 at 3:20pm*

**Statistics**

Assume it is known that the probability of birth is equal in all months. What is the probability that in the STAT class of 120 students, exactly 20 students have their birthdays in either August or September? Solve using (i) the exact Binomial distribution, (ii) the Normal ...
*Friday, February 28, 2014 at 9:56am*

**Statistics**

Two of the biggest soft drink rivals, Pepsi and Coke, are very concerned about their market shares. The pie chart that follows claims that PepsiCo's share of the beverage market is 25%. Assume that this proportion will be close to the probability that a person selected at ...
*Friday, February 28, 2014 at 9:02am*

**Statistics**

When calculating a confidence interval for the difference between two means, what information are one gaining?
*Friday, February 28, 2014 at 8:49am*

**Statistics **

Let X be a binomial random variable with n = 100 and p = 0.2. Find approximations to these probabilities. (Round your answers to four decimal places.) P(17 < X < 28) I get the answer as 0.7059 but it is wrong. I can't seem to figure this out... Help please
*Thursday, February 27, 2014 at 11:57pm*

**engineering**

Building and construction A. Architecture B. Engineering C. Nursing D. Statistics
*Thursday, February 27, 2014 at 8:53pm*

**statistics**

You have a score on a national entrance exam of 95. What percentage of people in the population have a score that is lower than yours? (Assume the population mean is 75 and the standard deviation is 10. Use the table I passed out in class.)
*Wednesday, February 26, 2014 at 11:47am*

**Statistics**

A report says that the between-subjects factor of participants’ salary produced significant differences in self-esteem. (a) What does this tell you about the design? (b) What does it tell you about the results?
*Wednesday, February 26, 2014 at 10:43am*

**Statistics**

A report says that the between-subjects factor of participants’ salary produced significant differences in self-esteem. (a) What does this tell you about the design? (b) What does it tell you about the results? 19.(a) Source Sum Squares df Mean Square F Between 134.800 3 ...
*Wednesday, February 26, 2014 at 10:41am*

**Statistics in Psychology**

Please Help! For the following, which type of t-test is required? (a) Studying the effects of a memory drug on Alzheimer’s patients, testing a group of patients before and after administration of the drug. (b) Studying whether men and women rate the persuasiveness of an ...
*Wednesday, February 26, 2014 at 9:11am*

**behavioral statistics**

How could you use standard scores and the standard distribution to compare the reading scores of two students receiving special reading resource help and one student in a standard classroom who does not get special help?
*Tuesday, February 25, 2014 at 8:29pm*

**Statistics**

The weights of male babies less than 2 months old in the United States is normally distributed with a mean of 11.5 pounds and a standard deviation of 2.7 pounds. Find the 80th percentile score for these weights. I don't have a table, I have to figure it out using the TI-84...
*Tuesday, February 25, 2014 at 7:13pm*

**Statistics**

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, ...
*Tuesday, February 25, 2014 at 7:10pm*

**Statistics 101**

A researcher plans to use a random sample of n= 500 families to estimate teh mean monthly family incomefor a large population. a 99% confidence interval based on the sample would be _________ than 90% confidence interval.
*Tuesday, February 25, 2014 at 6:43pm*

**Statistics**

The weights of male babies less than 2 months old in the United States is normally distributed with a mean of 11.5 pounds and a standard deviation of 2.7 pounds. Find the 80th percentile score for these weights.
*Tuesday, February 25, 2014 at 6:18pm*