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August 22, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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statistics
The mean score for all individuals who took the Law School Admission Test (LSAT) in 2010 was 155 and the standard deviation was 7. 9. What is the z score for a person, who received an LSAT score of 167? a. +1.71 b. +1.64 c. +1.74 d. -1.71 10.What is the raw score for a person ...
Friday, April 18, 2014 at 8:42pm

Statistics
A random sample of 47 students studied for an average of 7.1 hours last week. If the population standard deviation is 1.2 hours, what is the 90% confidence interval for the population mean?
Friday, April 18, 2014 at 11:19am

Statistics
A sample of 50 homes in a subdivision revealed that 24 were ranch style. a) Construct a 98 percent confidence interval for the true proportion of ranch-style homes b) Check the normaility assumption.
Friday, April 18, 2014 at 9:57am

statistics
in throwing two dice find the probability ofcoming even number on both probability of coming odd number on dice probability of different number on both dice
Friday, April 18, 2014 at 9:24am

statistics
a box contain five silp of paper marked 1,2,3,4and5 tow silp are selected without replacement,list the possible vaule for each of following random variable the sum of two number on two silp the difference between the first and second number
Friday, April 18, 2014 at 9:17am

Statistics
Hi, Are market returns (with numbers such as -3.45, 4, 2.456 representing the "returns") ordinal or nominal data? Thanks!
Friday, April 18, 2014 at 1:40am

Statistics Emergency please
People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a)What is the probability ...
Thursday, April 17, 2014 at 1:17pm

Statistics Emergency please
People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a.Show the sampling ...
Thursday, April 17, 2014 at 12:34pm

Language Arts
Read the following sentence from the editorial: "We learn that all of our moments can be filled with joy if we only open our hearts to our pets." How is faulty reasoning shown in this sentence? A. The author exaggerates the effect of owning a pet. B. The author makes...
Thursday, April 17, 2014 at 11:09am

statistics
According to an Internet posting, 80% of adults enjoy drinking beer. If a group of 3 adults is selected at random, find the probability that all of them enjoy drinking beer is:
Thursday, April 17, 2014 at 12:27am

statistics
A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
Wednesday, April 16, 2014 at 7:48pm

Statistics
People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a.Show the sampling ...
Wednesday, April 16, 2014 at 5:05pm

Statistics
The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): Assume that the population standard deviation on each part of the test is = 100. a. What is the probability a sample of 90 test takers will...
Wednesday, April 16, 2014 at 5:04pm

Statistics
A survey asked 2000 people whether or not they frequently exceed the speed limit. The collected data is summarized in the following contingency table. The goal is to determine if there is a difference in the population proportion that say “yes” when comparing those ...
Wednesday, April 16, 2014 at 2:24pm

Statistics
An ESP experiment is done in which a participant guesses which of 8 cards the researcher has randomly picked, where each card is equally likely to be selected. This is repeated for 200 trials. The null hypothesis is that the subject is guessing, while the alternative is that ...
Wednesday, April 16, 2014 at 12:20pm

statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
Wednesday, April 16, 2014 at 11:04am

statistics
The Good Mental Health Insurance Company has determined the number of new clients a psychologist gets per month and their respective probabilities, as shown in the table below: Number of New Clients Probability 0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05 The probability ...
Wednesday, April 16, 2014 at 8:49am

statistics
A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
Wednesday, April 16, 2014 at 8:37am

statistics
People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a.Show the sampling ...
Tuesday, April 15, 2014 at 10:06pm

statistics
The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): Assume that the population standard deviation on each part of the test is = 100. a. What is the probability a sample of 90 test takers will...
Tuesday, April 15, 2014 at 10:02pm

statistics
Suppose a random sample of size 50 is selected from a population with σ = 10. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). a. The population size is infinite (to 2 decimals). ...
Tuesday, April 15, 2014 at 10:00pm

statistics
The American Association of Individual Investors (AAII) polls its subscribers on a weekly basis to determine the number who are bullish, bearish, or neutral on the short-term prospects for the stock market. Their findings for the week ending March 2, 2006, are consistent with ...
Tuesday, April 15, 2014 at 9:59pm

statistics
A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
Tuesday, April 15, 2014 at 7:17pm

statistics
The mean score for all individuals who took the Law School Admission Test (LSAT) in 2010 was 155 and the standard deviation was 7. What is the z score for a person, who received an LSAT score of 167? a. +1.71 b. +1.64 c. +1.74 d. -1.71 What is the raw score for a person with a...
Tuesday, April 15, 2014 at 6:48pm

statistics
The Good Mental Health Insurance Company has determined the number of new clients a psychologist gets per month and their respective probabilities, as shown in the table below: Number of New Clients Probability 0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05 The probability ...
Tuesday, April 15, 2014 at 4:39pm

statistics
A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
Tuesday, April 15, 2014 at 4:21pm

Statistics
Find the indicated probability using the standard normal distribution: P(z<-1.45)
Tuesday, April 15, 2014 at 1:29pm

statistic
Listed below are the ages of actresses and actors at the times that they won Oscars for the categories of Best Actress and Best Actor. The ages are listed in chronological order by row, so that corresponding locations in the two tables are from the same year. (Notes: In 1968 ...
Tuesday, April 15, 2014 at 1:10pm

statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
Tuesday, April 15, 2014 at 12:59pm

statistics
A manufacturer ships toasters in cartons of 50. In each carton, they estimate a 2% chance that one of the toasters will need to be sent back for minor repairs. In a batch of 25,000 toasters, what are the chances that fewer than 475 need to be returned? The probability that ...
Tuesday, April 15, 2014 at 12:02pm

statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
Tuesday, April 15, 2014 at 10:24am

statistics
Which of the following percentiles corresponds to the area beneath the standard normal curve from a z score of-3.00 to + 3.00? a. 98% b. 100% c. 95% d. 99.7%
Tuesday, April 15, 2014 at 8:33am

statistics
Jorge finds that his standardized z score on an IQ is 2.0. What percentage of people did he score higher than? a. 98 b. 96 c. 68 d. 34
Tuesday, April 15, 2014 at 8:31am

statistics
Professor Smith gave a final exam in her history class. The scores on the final exam are normally distributed with a mean of 75 and a standard deviation of 6. If Professor Smith wishes to give A’s to the top 4%, what would be the cutoff score be for A’s? a. 90.0 b. ...
Monday, April 14, 2014 at 11:25pm

statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
Monday, April 14, 2014 at 11:18pm

statistics
Ashley and Sanjay are donating blood at a local hospital. As a standard practice, the blood is screened for anemia (low levels of red blood cells), and the results are given to each donor as a z score, ranging from negative scores (low amounts of red blood cells, anemic) to ...
Monday, April 14, 2014 at 10:49pm

statistics
Leslie took two midterm exams and earned the following scores: 82 on the chemistry exam (class distribution: μ = 75, σ = 6.25) and 63 on the physics exam (class distribution: μ = 59, σ = 3.57). Rounding to two decimal points, on which exam should Leslie get...
Monday, April 14, 2014 at 10:27pm

statistics
People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a. Show the sampling ...
Monday, April 14, 2014 at 5:17pm

statistics
Assume that the population proportion is .55. Compute the standard error of the proportion, ( ), for sample sizes of 100, 200, 500, and 1000 (to 4 decimals). a. 100? b. 200? c. 500? d. 1000?
Monday, April 14, 2014 at 5:16pm

statistics
The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): Assume that the population standard deviation on each part of the test is = 100. a. What is the probability a sample of 90 test takers will...
Monday, April 14, 2014 at 5:15pm

statistics
Suppose a random sample of size 50 is selected from a population with σ = 10. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). a. The population size is infinite (to 2 decimals). ...
Monday, April 14, 2014 at 5:14pm

statistics
Many drugs used to treat cancer are expensive. BusinessWeek reported on the cost per treatment of Herceptin, a drug used to treat breast cancer (BusinessWeek, January 30, 2006). Typical treatment costs (in dollars) for Herceptin are provided by a simple random sample of 10 ...
Monday, April 14, 2014 at 5:10pm

statistics
What is wrong with the statement: It is believed that the proportion of Middle School teachers who leave the profession within 5 years is different from the proportion of High School teachers who leave the profession within 5 years. Test with a level of significance of 0.05. ...
Monday, April 14, 2014 at 1:05pm

statistics
the subway train has 18 doors and starts with 15 passenger. if each passenger is equally likely to get off at any station and the passengers leave the train independently, find the probability that 2 or more passengers leave the train through the same door
Sunday, April 13, 2014 at 10:28pm

statistics
In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 12 patients using the drug is selected. If you wanted to find the probability that exactly three will have this mild side effect, what would be the ...
Saturday, April 12, 2014 at 11:59pm

Statistics
Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is $120,000. This distribution follows the normal distribution with a standard deviation of $38,000. (A) If we select a random sample of 58 ...
Friday, April 11, 2014 at 11:35pm

Statistics
A cola-dispensing machine is set to dispense a mean of 2.024 liters into a container labeled 2 liters. Actual quantities dispensed vary and the amounts are normally distributed with a standard deviation of 0.040 liters. What is the probability a container will have less than 2...
Friday, April 11, 2014 at 7:11pm

Statistics
An accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before they failed is 19.0 hours. The distribution of the lives approximated a normal distribution. The standard deviation of the distribution was 1.2 hours...
Friday, April 11, 2014 at 6:17pm

Elementary Statistics
There are 100 questions from an SAT test, and they are all multiple choice with possible answers of a,b,c,d,e. For each question, only one answer is correct, find the standard deviation for the numbers of correct answers for those who make random guesses for all 100 questions.
Friday, April 11, 2014 at 3:22pm

Statistics
Daily output of Marathon's Grayville, LA, Refinery is normally Distributed with a mean of 232,000 barrels of crude oil per day with a standard deviation of 7,000 barrels. a. what is the probability of producing at least 232,000 barrels? b. between 232,000 and 239,000 ...
Friday, April 11, 2014 at 11:05am

Statistics
The Weight of a small Starbucks coffee is normally distributed random variable with a mean of 360 grams and a standard deviation of 9 grams. Find the weight that corresponds to each event. a. highest 10% b. highest 50% c. highest 5% D. highest 80% e. lowest 10% f. middle 50% g...
Friday, April 11, 2014 at 10:47am

Statistics
The Amount of filling a half-liter (500ml)soft drink bottle is normally distributed. The process has a standard deviation of 5ml. The mean is adjustable. A. Where should the mean be set to ensure a 95% probability that a half-liter bottle will not be under filled? B. A 99% ...
Friday, April 11, 2014 at 10:39am

statistics
Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 28 Minutes and a standard deviation of 4 minutes, while B has a mean of 32 minutes and a standard deviation of 2 minutes. a)which procedure is preferred if the procedure must...
Friday, April 11, 2014 at 10:35am

statistics
A large number of applicants for admission to graduate study in business are given an aptitude test with a resulting mean score of 460 with a standard deviation of 80. The top 2.5 percent of the applicants would have a score of at what? A. 606 B. 617 C. 600 D. 646
Friday, April 11, 2014 at 10:07am

statistics; emergency please help me
Assume a binomial probability distribution has p = .60 and n = 200. a. What is the probability of 100 to 110 successes (to 4 decimals)? b. What is the probability of 130 or more successes (to 4 decimals)?
Thursday, April 10, 2014 at 9:29pm

statistics; emergency please help me
Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). a. P(z -1.5) b. P(z -2.5)
Thursday, April 10, 2014 at 9:25pm

Statistics
If a company’s total fixed costs increased by $20,000 and its contribution margin decreased by $12,000, net income would be?
Thursday, April 10, 2014 at 4:11pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Wednesday, April 9, 2014 at 8:53pm

statistics
There are 652 males, 396 say they have been to dentist in past year. Give a confidence interval for 90% of the population proportion.
Wednesday, April 9, 2014 at 6:33pm

Statistics
When is it appropriate to draw a causal connection between two measurement variables? In other words, what conditions must be met in the study and in the analysis to show a causal relationship? My answer : 1.There needs to be a reasonable explanation of cause and effect. 2.The...
Wednesday, April 9, 2014 at 2:32pm

statistics
A survey was taken in various Statistics classes and the following regression equation was obtained regarding the height and weight of students in the Statistics classes. Regression equation Height = 56.8 + 0.0712 Weight Given the regression equation above, what is the correct...
Wednesday, April 9, 2014 at 2:12pm

Statistics
Suppose that 50% of people frequently exceed the speed limit. A random sample of 2000 people is surveyed and 55% indicate that they frequently speed. What is the value of the population percent given to you in the problem?
Wednesday, April 9, 2014 at 12:35pm

math
Weights of the vegetables in a field are normally distributed. From a sample Carl Cornfield determines the mean weight of a box of vegetables to be 180 oz. with a standard deviation of 8 oz. He wonders what percent of the vegetable boxes he has grouped for sale will have a ...
Wednesday, April 9, 2014 at 2:24am

statistics; emergency please help me
Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). c. P(z -1.5) d. P(z -2.5)
Tuesday, April 8, 2014 at 9:16pm

statistics; emergency please help me
Assume a binomial probability distribution has p = .60 and n = 200. c. What is the probability of 100 to 110 successes (to 4 decimals)? d.What is the probability of 130 or more successes (to 4 decimals)?
Tuesday, April 8, 2014 at 9:15pm

statistics; emergency please help me
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Tuesday, April 8, 2014 at 9:11pm

statistics
Find the test statistic, P-value, and critical value. Round to 3 decimal places. Claim: The mean IQ score of statistics professors is greater than 118. Sample data: n = 50, x = 120. Assume that σ = 15 and the significance level is α = .05 test statistic = P-value = ...
Tuesday, April 8, 2014 at 6:55pm

statistics
if 2 out of 100 second graders are randomly selected, find the probability that they are both boys and like spring. boys/spring 39
Monday, April 7, 2014 at 11:48pm

Statistics PLEASE HELP ME!
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Monday, April 7, 2014 at 10:36pm

Economic/Statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Monday, April 7, 2014 at 9:27pm

Statistics
In a survey of 621 males ages 18-64 , 396 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the proportion. Interpret the results and compare the widths of the confidence intervals. Please show step by step. Thank you!
Monday, April 7, 2014 at 9:09pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Monday, April 7, 2014 at 7:52pm

Statistics
In a recent study, 100 males used a new weight-loss supplement, and all but 20 of them experienced weight loss after two weeks. In the same study, 20 females used the same supplement, and all but 4 of them experienced weight loss after two weeks. The new weight loss supplement...
Monday, April 7, 2014 at 7:29pm

Statistics
Professor York randomly surveyed 240 students at Oxnard University, and found that 150 of the students surveyed watch more than 10 hours of television weekly. Develop a 95% confidence interval to estimate the true proportion of students who watch more than 10 hours of ...
Monday, April 7, 2014 at 6:54pm

statistics
Assume a binomial probability distribution has p = .60 and n = 200. c. What is the probability of 100 to 110 successes (to 4 decimals)? d. What is the probability of 130 or more successes (to 4 decimals)?
Monday, April 7, 2014 at 5:14pm

statistics
Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). P(z -1.0) P(z -1.0) P(z -1.5) P(z -2.5) P(-3 < z 0)
Monday, April 7, 2014 at 5:13pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Monday, April 7, 2014 at 5:13pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Sunday, April 6, 2014 at 9:04pm

statistics
Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). P(z -1.0) P(z -1.0) P(z -1.5) P(z -2.5) P(-3 < z 0)
Sunday, April 6, 2014 at 9:02pm

statistics
Assume a binomial probability distribution has p = .60 and n = 200. c. What is the probability of 100 to 110 successes (to 4 decimals)? d. What is the probability of 130 or more successes (to 4 decimals)?
Sunday, April 6, 2014 at 9:01pm

statistics
11.68 is what percent of 141
Sunday, April 6, 2014 at 5:47pm

Statistics
1. For the following research question, specify the parameter and give the null and alternative hypotheses. "Is there a difference in the proportions of male and female college students who smoke cigarettes? 2. For the following research question, specify the parameter ...
Sunday, April 6, 2014 at 4:04pm

Statistics
A procedure in regression analysis where Predictor or Independent Variables are coded as 1 or 0 (representing categories) and can be used to produce ANOVA Tables under the General Linear Model is known as…?
Sunday, April 6, 2014 at 12:42pm

statistics
Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). P(z -1.0) P(z -1.0) P(z -1.5) P(z -2.5) P(-3 < z 0)
Saturday, April 5, 2014 at 11:42pm

statistics
Assume a binomial probability distribution has p = .60 and n = 200. a)What are the mean and standard deviation (to 2 decimals)? b)Why can the normal probability distribution be used to approximate this binomial distribution? c)What is the probability of 100 to 110 successes (...
Saturday, April 5, 2014 at 11:42pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Saturday, April 5, 2014 at 11:40pm

Statistics
The height of a certain species of a tree are normally distributed with a mean of 30ft and stand dev of 4ft. If a random sample of 16 of these trees is taken, what is the probability that the sample mean is less than 32fy?
Saturday, April 5, 2014 at 8:03pm

statistics
You are responsible for planning the parking needed for a new 256-unit apartment complex, and you are told to base the needs on the statistic “average number of vehicles per household is 1.9.” Which average (mean, median, mode) would be best if: • You wanted to ...
Saturday, April 5, 2014 at 1:13pm

Statistics
You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability= ? My answer is 0.301 3 decimal ...
Saturday, April 5, 2014 at 11:35am

Statistics
a procedure in REGRESSION NALYSIS WHERE PREDICTOR OR INDEPENDENT VARIABLES ARE CODED AS 1 OR 0 (REPRESENTING CATEGORIES) AND CAN BE USED TO PRODUCE ANOVA TABLES UNDER THE GENERAL LINEAR MODEL IS KNOWN AS?
Saturday, April 5, 2014 at 8:58am

Statistics
You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability =??
Friday, April 4, 2014 at 11:28pm

statistics
Dylan wants to determine a 90 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must he have to get a margin of error less than 0.03? [To find n, use the value p* = 1/2 for the ...
Friday, April 4, 2014 at 9:10pm

Business statistics
You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability=
Friday, April 4, 2014 at 8:19pm

Statistics
A survey of top executives revealed that 37% of them regularly read Time magazine, 21% read Newsweek and 38% read U.S. News & World Report. Eleven percent read both Time and U.S. News & World Report. What is the probability that a particular top executive reads either Time or ...
Friday, April 4, 2014 at 7:46pm

Statistics
You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability=
Friday, April 4, 2014 at 6:52pm

Statistics
A survey of top executives revealed that 37% of them regularly read Time magazine, 21% read Newsweek and 38% read U.S. News & World Report. Eleven percent read both Time and U.S. News & World Report. What is the probability that a particular top executive reads either Time or ...
Friday, April 4, 2014 at 6:39pm

Statistics
The National Center for Health Statistics reported that of every 894 deaths in recent years, 25 resulted from an automobile accident, 185 from cancer and 309 from heart disease. What is the probability that a particular death is due to an automobile accident? 25/309 or 0.081 ...
Friday, April 4, 2014 at 6:20pm

Statistics
The heights of 18 year old men are approximately normally distributed, with a mean of 67 inches and a standard deviation of 5 inches. What is the probability an 18 year old man selected at random is between 66 and 68 inches? Use FOUR decimal places.
Friday, April 4, 2014 at 1:43pm

Statistics - Please help
An experiment was conducted to determine the abrasion resistance of a new type of automobile paint. Twelve different strips of metal were painted with the new paint. The abrasion resistance of each piece was then tested on a machine. In the sample, the abrasion resistance ...
Thursday, April 3, 2014 at 3:55pm

statistics
à manufacturer of computers designed to aid social scientists in analyzing research data clams that his computers are opérational for at least 80 percent of the time. during the course of the year one computer was operational for 270 days. test, 1 percent ...
Thursday, April 3, 2014 at 6:47am

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