# Homework Help: Math: Statistics

## Recent Homework Questions About Statistics

**statistics help please :(**

A shipment of 50 parts contains 11 defective parts. Suppose 3 parts are selected at random, without replacement, from the shipment. What is the probability that exactly 2 parts are not defective?

**Math (Statistics)**

jean has an IQ that corresponds to 81% percentile rank. if there are 21 girls in the group, how many of them have an higher IQ than Jean? thanks...:)

**statistics**

A shipment of 50 parts contains 12 defective parts. Suppose 3 parts are selected at random, without replacement, from the shipment. What is the probability that all 3 parts are defective?

**statistics help please**

A set of data is NOT NORMALLY DISTRIBUTED. The mean is 300, and the standard deviation is 10. According to Chebyshev's Theorem, atleast what percent of the data would lie between 270 and 330? The farthest I got was 1- 1/10squared x 100% = .99, I am not sure if this is correct ...

**statistics**

Directional and nondirectional hypotheses can be easily interchanged according to the hypothesis the researcher is testing. For instance, a drug company might predict that a drug will help a subject lose weight while another drug company might predict that a drug will alter a ...

**Behavioral Statistics Help!**

Suppose we had conducted an ANOVA, with individuals grouped by political affiliation (Republican, Democrat, and Other), and we were interested in how satisfied they were with the current administration. Satisfaction was measured on a scale of 1-10, so it was measured on a ...

**Statistics**

A US travel data center survey of 1500 adults found that 42% of the respondents stated that they favor historical sites as vacations find the 95% confidence interval of the troop portion of all adults who favor historical sites as vacation

**statistics**

The average cost per night of a hotel room in New York City is $272 (SmartMoney, March 2009). Assume this estimate is based on a sample of 45 hotels and that the sample standard deviation is $65.

**statistics**

the probability that a key component of a stand -by generator will fail during a power outage is q. A generator works if at least half of its key component work.Assuming that the the generator has four key components. find the probability that the generator will work

**math3, probability and statistics**

plss solve and explain, x= 5, X2-X3=5, X4=7, X5=10

**statistics**

Given a sample size of 36, with sample mean 400 and sample standard deviation 85, we perform the following hypothesis test, at the 95% level of confidence: Ho: ƒÊ = 450, Ha: ƒÊ ‚ 450. What is the question and what is the answer?

**Statistics**

Chi-square tests are nonparametric tests that examine nominal categories as opposed to numerical values. Consider a situation in which you may want to transform numerical scores into categories. Provide a specific example of a situation in which categories are more informative...

**statistics help**

Tests on a Chevy Cobalt incdicate a population mean of 32 mpg and a population standard deviation of 3.5 mpg. You take an SRS (sample random sample) of 10 cars to get a sample mean. What is the probability that your sample mean is greater than 34 mpg? I am not sure how to go ...

**Statistics**

c) There is a correlation between students’ levels of anxiety and the number of days they are absent from school (r = 0.53, p = 0.31). Interpret if this result was statistically significant and explain why or why not. My answer is this: The analysis gives us a correlation ...

**statistics**

how many different bidge cad can be selected fom an odinay deck of 52 cads

**Critical thinking**

I have finished my assignment I just need someone to read it over and check my logic, please and thank you! 1. Read the following argument and answer the question that follows: 1. According to the 2010/11 Statistics Canada census aboriginal Canadians constituted 4.3% of the ...

**Statistics**

A machine fills 12 ounce bottles with soda. For the machine to function properly, the standard deviation of the sample must be less than or equal to 0.02 ounce. A sample of 8 bottles is selected, and the number of ounces of soda in each bottle is given. At alpha +0.05, can you...

**statistics help**

The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that AT LEAST 175 home are going to be used as investment property?

**statistics help??**

Someone flips a coin 50 times and gets 50 heads in a row. You suspect it is a 2 headed coin. Write the null and alternative hypotheses. Use the binomial theorem to get a p-value of getting exactly 50 hears in 50 trials.

**Philosophy**

Read the following argument and answer the question that follows: 1. According to the 2010/11 Statistics Canada census aboriginal Canadians constituted 4.3% of the Canadian population. 2. According to the 2011 Statistics Canada data, 27% of the adult population incarcerated in...

**statistics**

A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner selects 25 of these batteries and finds the mean lifetime to be 1380 hours with a standard deviation of 80 hours. Test the manufacturers claim. Use alpha = 0.05. Round the test ...

**statistics**

A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. Use a 95% ...

**Statistics**

I have gotten the concept of probability but the following question has really stumped me. Help please. The probability that a tomato seed will germinate is 0.9. Estimate the probability that of 100 randomly selected seeds, at least 86, but no more than 91 of them will ...

**Physics, Statistics**

Consider a series of 8 flips of a fair coin. (a) Calculate the probabilities for obtaining 0-8 heads. We will consider each of these nine outcomes to be macrostates of the system. (b) Calculate the entropy for each of these macrostates. I was able to figure out part A, but I'm...

**STATISTICS**

Before accepting a large shipment of bolts, the director of an elevator construction project checks the tensile strength of a simple random sample consisting of 20 bolts. She is concerned that the bolts may be counterfeits, which bear the proper markings for this grade of bolt...

**STATISTICS**

t has been claimed that 65% of homeowners would prefer to heat with electricity instead of gas. A study finds that 60% of 2000 homeowners prefer electric heating to gas. Can we conclude that the percentage who prefer electric heating differs from 65%? Use alpha = 10%

**statistics**

A person rolls a standard six-sided die 7 times. In how many ways can he get 2 fives, 4 sixes, and 1 two?

**statistics**

a student gets the following grades in his 5 subjects: 87 for calculu; 82 for Physics; 79 for Chemistry; 81 for english; 83 for history. Compute the weighted mean if the weights for the 5 subjects are 5,4,4,3, and 3, repectively

**statistics**

true or false if there were 15 difference scores in a matched pairs design then there were 28 participants in the study

**statistics and probability**

Find x and y so that the ordered data set as a mean of 42and a median of 35. 17,22,26,29,34,x,42,67,70,56,y soln: 17+22+26+29+34+x+42+67+70+56+y= 363+x+y (363+x+y)/11=42 y=99/x x is median

**statistics and probability**

scores on a nationwide professional qualifying exam, have a mean of 600 and a standard deviation of 50.A random sample of 100 examinees was selected.The sample mean was 360.what was the standardized value or z-score of the sample mean in this instance. soln: Z=VALUE-MEAN/...

**statistics and probability**

Jeremy sells a magazine which is produced in order to raise money for homeless people.The probability of making a sell is independently 0.09 fr each person he approaches.Given that he approaches 40 people,find the probability that he will make; (a) Two or few sells solution. B...

**statistics and probability**

A shipment of 20 computers contains 4 defective machines.Two computers are selected at random without replacement and tested for being detective. (a). is this a binomial experiment? why or why not solution. Yes. because each trial can result in just two possible outcomes. (b...

**statistics and probability**

When a die is rolled and a coin(with heads and tails) is tossed,find the probability of obtaining, (a). Tails and an even number. solution. A={HH,TT,HT,HT} B={HH,TH} (b). A number greater than 3 SOLUTION. let event C=(AuB) P(C)=P(AuB)=P(A)+P(B)-P(AnB) =3/4

**statistics**

A researcher is interested in determining whether acupuncture affects pain tolerance. An experiment is performed in which 15 students are randomly chosen from a large pool of university undergraduate volunteers. Each subject serves in two conditions. In both conditions, each ...

**help fast fast**

for which of the following purpose can a database be used? A.to store ionformation B.to keep track of items in a warehouse C.to track the statistics of athlets and sport tems D.all of the above

**Statistics, Math**

For 30 randomly selected Rolling Stones concerts, the mean gross earnings is 2.37 million dollars. Assuming a population standard deviation gross earnings of 0.52 million dollars, obtain a 99% confidence interval for the mean gross earnings of all Rolling Stones concerts (in ...

**Math - Statistics**

A six-sided die is rolled 36 times. What is the probability that an odd number is rolled at most 15 times? What is the probability that an odd number is rolled exactly 15 times? Use the Normal Approximation to a Binomial.

**Statistic**

We thought if we each post a question you would answer our question. This is not a game we need help for our statistics math course before Monday day

**Statistic**

professor has found that the grades on a Statistics Exam are normally distributed with mean 72 and a standard deviation of 12. If only the best 15 % of the grades in the class will get an A, what grade must a student get in order to get an A?

**statistics (math)**

of college students 45% are women 8% have a GED. suppose a student is selected at random. Given that the selected employees is a woman. what is the probability that she has a GED

**English**

Okayy Im really stuck on this one, Im usually good at analyzing and figuring out what a poem means. But not this one... QUESTION: What does the author achieve by mixing exact and approximate numbers in "A Contribution to Statistics?" A CONTRIBUTION TO STATISTICS Out of a ...

**statistics**

Large group of students took a test in English and the final grades have a mean of 75 and a standard deviation of 8. If we can approximate the distribution of these grades by a normal distribution. What percentage of the students (ii) Should pass the test (grades >= 60) (...

**statistics(business)**

Large group of students took a test in English and the final grades have a mean of 75 and a standard deviation of 8. If we can approximate the distribution of these grades by a normal distribution. What percentage of the students (ii) Should pass the test (grades >= 60) (...

**Statistics need help**

Need help please on these questions: 1. A poll at Steve's high school was taken to see if students are in favor of spending class money to expand the junior-senior parking lot. Steve surveyed 6 random students from the population. 85% favored the expansion, while 15% opposed ...

**Statistics**

One last one. A poll at Steve's high school was taken to see if students are in favor of spending class money to expand the junior-senior parking lot. Steve surveyed 6 random students from the population. 85% favored the expansion, while 15% opposed it. a) Determine the ...

**Statistics**

3. For the following data set, the dependent variable {response) is the first variable. Choose the independent variables {predictors) as you judge appropriate. Use a spreadsheet or a statistical package (e.g., SPSS or SYSTAT or MIN1TAB) to perform the necessary regression ...

**Mat 300/statistics**

In how many ways can a committee consisting of 2 faculty members and 3 students be for there are 11 faculty members and 14 students eligible to serve on the committee?

**Statistics**

The ratio of brown M&M’s in a bag is stated by the candy company to be 56%. If a random sample of 500 bags is selected, determine the probability that the sample proportion of random bags of M&M’s selected has a percentage of brown between 51% and 59% p=.56 standard ...

**statistics**

In a recent season, the population standard deviation of the yards per carry for all running backs was 1.241.24. The yards per carry of 25 randomly selected running backs are shown below. Assume the yards per carry are normally distributed. 1.81.8 4.54.5 7.47.4 5.85.8 5...

**Math**

Forty-five percent of a large class of students in Statistics are females. Suppose 28 students are selected at random from the class. Use a normal approximation with continuity correction to calculate the probability that the number of males in the sample is at least 12 but ...

**Statistics**

Find the critical value za/2 that corresponds to a=0.12.

**Behavioral Statistics Help!**

There are also potential problems associated with interpreting the results of a paired t-test. Imagine you are interested in determining whether an employee of a company performs better with or without a bonus. What are some issues that could affect the results if you have the...

**Statistics**

A survey of physicians in 1979 found that some doctors give a placebo to patients who complain of pain for which the physician can find no cause. If the patients' pain improves, these doctors conclude that it had no physical basis. The medical researchers who conducted the ...

**Statistics**

The percent of fat calories that a person in America consumes each day is normally distributed with a mean of 36 and a standard deviation of about 10. Suppose that 16 individuals are randomly chosen for an experiment. A) Is it appropriate to use the normal approximation for ...

**statistics**

how even numbers greater than 40,000 may be formed using the digits 3,4,5,6,and 9 if each digit must be used exactly once in each number?

**Statistics**

An urn contains three yellow,four green and five blue balls. Two balls are randomly drawn without replacement. Find the probability of the following events: a.both balls are blue. b.the first ball is green and the second yellow. c.there is one green and one yellow ball

**Statistics**

The weekly amount of gas sold at a self serve gas station has a uniform distribution on the interval 5000 to 15,000 gallons. If the dealer begins the week with 12,625 gallons in his supply tank what is the probability that he will run out of gas before the end of the week

**statistics**

The time needed to complete a final examination in a particular college course is normally distributed with a mean of 79 minutes and a standard deviation of 8 minutes. Answer the following questions. Assume that the class has 60 students and that the examination period is 90 ...

**Maths**

Statistics The marks scored by a sample of 56 students are summarised by: N=56 Sum of x =3026 sum of(x-the mean)^2 =15378 A) calculate the mean and the standard deviation Mean I got - 54.04 (2.dp) Standard deviation I got - 16.72 (2.dp) Is this correct? B) the formula y=1.2x-...

**statistics**

in a lottery, a player wins or shares in the jackpot by selecting the correct 6-number combination when six different numbers from 1 through 49 are drawn. if a player selects one particular 6-number combination, find the probability of winning the jackpot.

**Maths**

Statistics The marks scored by a sample of 56 students are summarised by: N=56 Sum of x =3026 sum of(x-the mean)^2 =15378 A) calculate the mean and the standard deviation Mean I got - 54.04 (2.dp) Standard deviation I got - 16.72 (2.dp) Is this correct? B) the formula y=1.2x-...

**business statistics**

A sample of 900 items is taken from a population with standard deviation 15. The mean of the sample is 25. Test whether the sample has come from a population with mean 26.8. Take a=5%

**Statistics**

Use normal approximation to find the probability of the indicated number of voters. In this case, assume that 184 eligible voters aged 18-24 are randomly selected. Suppose a previous study showed that among eligible voters aged 18-24, 22% of them voted. Probability that fewer ...

**Statistics**

Create a null hypothesis or the following research questions: (a) What are the differences between emergency room shifts on medication errors? (b) On a clinical trail of a new drug, what will be the effects over a currently used drug?

**Statistics Help!**

An insurance company asks you to determine whether older drivers are safer than younger ones. Provide a directional hypothesis related to this study. Then, explain how you would need to change the hypothesis so that it would be non-directional. What happens to the rejection ...

**Statistics**

the length of times it takes college students to find a parking spot im the library parking lot follows a normal distribution with a mean of 5.5 minutes and a standard deviation of 1 minute. find the cut off time which 75.8% of the college students exceed when trying to find a...

**statistics**

A student has a mean score of five tests taken. What score must she obtain on her next test to have a mean average of 88 on all six tests?

**Statistics Help Please!**

When computing a t-test, it is important to distinguish between directional and nondirectional hypotheses as the direction will determine the rejection regions. Describe how the rejection regions would differ according to the type of hypothesis you would use.

**business math and statistics**

in the formula for calculating present value the letter R represent the

**Statistics**

10. A teacher gives 200 students a study guide for a test and the average score was 90 with a standard deviation of 6. She did not give the other 200 students a study guide and their average score was 70 with a standard deviation of 8. Find the critical value to determine ...

**Statistics**

10. A teacher gives 200 students a study guide for a test and the average score was 90 with a standard deviation of 6. She did not give the other 200 students a study guide and their average score was 70 with a standard deviation of 8. Find the critical value to determine ...

**Statistics**

We observe a sample proprotion p-hat = 0.3. If the standard deviation of the sampling distribution of p-hat is 0.04, what is the 95% confidence interval for p?

**Statistics**

A marketing research firm wishes to determine if the residents of Caldwell, Idaho, would be interested in a new downtown restaurant. The firm selects a simple random sample of 120 phone numbers from the Caldwell phone book and calls each household. Only 62 of those called are ...

**Statistics**

Researchers wish to determine if a new experimental medication will reduce the symptoms of allergy sufferers without the side-effect of drowsiness. To investigate this question, the researchers give the new medication to 50 adult volunteers who suffer from allergies. Forty-...

**Statistics**

For a certain computer program a password must be exactly 5 characters long the first character must be a number 0-5, the second third and fourth character can either be one of the 26 letters or a number 0-9, the fifth character has to be exactly the same as the second ...

**Statistics**

Team X has an average (mean) height of 70 inches and a standard deviation of 3 inches and Team Y has an average height of 67 inches with a standard deviation of 9 inches. Compare the two teams using this information and which team will have the tallest and shortest player ...

**Statistics and probability**

A psychologist tested the IQ in a sample of 36 children. Their mean IQ was 104. What is the probability of getting an IQ score of 104 or higher? The mean is 100, and the standard deviation is 15

**please give me a site or answer!!!!**

description of the population statistics LOCATION in South Carolina already found the age and race just having trouble with the location statistics please help!!!!!!

**Statistics**

A bag contains 5 purple marbles, 7 yellow marbles, and 3 orange marbles. If two marbles are selected from the bag: What is the probability that an orange then a yellow are chosen with replacement?

**Statistics**

What is the probability of randomly selecting a red marble from a jar that contains 10 red marbles and 20 blue marbles?

**Statistics**

Describe a situation in which you would test a directional hypothesis. Be sure to state the independent variables (e.g., drug or placebo) and the dependent variables (e.g., weight loss) clearly and explain why the hypothesis is directional. Then, revise the same situation to ...

**statistics**

when figuring mode, mean and median do you add all the like figure such as days and no. of discharges? you don't just add all the numbers up together right?

**Statistics**

Directional and non-directional hypotheses can be easily interchanged according to the hypothesis the researcher is testing. For instance, a drug company might predict that a drug will help a subject lose weight while another drug company might predict that a drug will alter a...

**Health statistics**

An employee currently earning $13.85 per hour has been awarded a 3.5 percent merit raise. What will gge employee's hourly salary be with this increase. 13.85x3.5=48.475 is what I'm thinking

**statistics**

An exam is standardized to a Normal model, with a mean of 105 and a standard deviation of 18. Based on the Normal model N(105, 18) What exam score represents the 96th percentile? What percentile of an exam score of 100 represent?

**Statistics**

The following are Exam scores for a group of Mathematics students. a) Group this data by using the Sturges’ formula to determine the number of classes. Keep the width of each class equal. b) Find the mean, standard deviation and variance of the grouped data obtained in (a) ...

**Probability and Statistics**

In a toy manufacturing company three machines A,B and C are employed to manufactures toys. Machines A, B and C manufacture 20%, 30% and 50% of the total toys respectively. A quality control officer examined the machines and found that A,B and C produce 2%, 3% and 5% defectives...

**statistics**

one of the points in a set of points if (4,8). What is the residual for this point if the equation of the regression line for these points is y=3.6+1.8x

**English**

In the story "A Contribution to Statistics" 1.) Which of the following words best describes the author's view of humanity? a.) altruistic b.) optimistic c.) pessimistic d.) realistic my answer is a

**Statistics and probability**

In a town the probability that an inhabitant catches malaria in any month is 0.2A farm in the town employed 15 local people Find the mean and variance of the number of employees catching malaria

**Statistics**

Find the indicated probability: P(z<0.18 or z>2.13) I'm stumped and can't find material on how to do this anywhere. I can do something like P(0.18>z<2.13) but not this. PLEASE HAAALLLP!

**Statistics HELP!!**

Identify an example of a population that you would expect to be normally distributed. Explain why, according to you, it would be normally distributed. Then, describe a subset of the population you identified and explain why it would not be normally distributed and what the ...

**statistics**

what is the difference between the coefficient of determination and residuals

**Statistics**

A certain type of artificial heart has four independent, critical components.Failure of any one of these components is a serious problem that will cause the artificial heart to fail. The 5 year failure rate for each component follows: component 1=.02, component 2=.05, ...

**Statistics - PLEASE HELP!**

For a lottery game, each ticket has a probability of 1 / 3.09 = 0.324 of winning a prize. Every friday you buy 1 lottery game. a) What is the probability you will win on two of your next three games?

**Behavioral Statistics Help!**

The majority of the data is normally distributed if there are enough subjects. For instance, if you collected test scores of only a few honor students, the data will most likely not be normally distributed because you would have a sample that did not represent the entire ...

**Behavioral Statistics**

Let's say that the standardized test had 100 possible points. If we wanted to identify the top 25%, why not just select those with raw scores above 75? Why do we have to standardize the scores?

**Geography**

What country has similar statistics to Sweden

**History**

Haiti and Cuba are relatively close to each other. What is your theory on why their population statistics are so different?