# Statistics

**Statistics**

How to find observed frequenty?

**statistics help**

the average of USA university vice chancellors are normally distributed with mean 57 and variance 225.if a vice chancellor is chosen at randon what is the probability that his/her age is (a):more than 52years [b):less than 48years (c):between 40 and 64 years #so much

**statistics**

A committee of 4 person is to be appointed from 7 men and 3 women, what is the probability that the committee contain exactly 2 women. At least one man.

**statistics**

A committee of 4 person is to be appointed from 7 men and 3 women, what is the probability that the committee contain exactly 2 women. At least one man.

**Statistics**

Roulette wheels in Nevada have 38 pockets. They are all numbered 0, 00, and 1 through 36. Of all 38 pockets, there are 18 red, 18 are black, and 2 are green. Each time the wheel is spun, a ball lands in one of the pockets, and each pocket is equally likely. If you spin the ...

**Statistics**

Roulette wheels in Nevada have 38 pockets. They are all numbered 0, 00, and 1 through 36. Of all 38 pockets, there are 18 red, 18 are black, and 2 are green. Each time the wheel is spun, a ball lands in one of the pockets, and each pocket is equally likely. If you spin the ...

**Statistics**

A card is drawn from a well shuffled deck of 52 cards. Find P (drawing an acre or a 9)

**Statistics Math**

There are 3 men sitting in a row facing the same way. Their names are A,B, AND, C. a hat has been placed on their heads without them seeing their own or anyone else's. A can see B and C, B can see only C, C sees none. The game goes as follows: (it can have 1,2,3 quest.) A is ...

**History**

1.How did New England's textile industry affect both children and women? (5 points) ⦁ It allowed them to earn a living wage until the age of 25. ⦁ It gave them opportunities not available on family farms. ⦁ It permitted them to complete their schooling. &#...

**Statistics**

θ=0.5 θ=1 θ=2 θ=3 λ = 2 θ = 0.5 μ = 0.5 σ = 0.5 θ=0.5 0 2 1 0.270670566 2 0.036631278 3 0.004957504 4 0.000670925 5 9.07999E-05 draw the graph for θ=1 θ=2 θ=3 The first θ=0.5 graph was drawn for you so follow the...

**Statistics**

A sign on the petrol pumps of a chain of petrol stations encourages customers to have their oil checked, claiming that one out of every four cars should have its oil topped up. Assuming this claim is true: (b) What is the probability that at least half of the next 10 cars ...

**Business Statistics**

(a) Of the next 10 cars entering a petrol station, what is the probability that exactly three of them should have their oil topped up?

**Statistics**

Bookstore has a website for which 90 percent of their book sales are to out of state customers and not subject to the collection of sales tax . The sample proportion of all sales to out of state customers from samples of size 100 will vary in repeated sampling. The sampling ...

**Statistics**

Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial. n=19, x=15 p=.85, find P(15)

**math**

1.Among 90 pieces of mail delivered to the library of a college,50 are addressed to the faculty of Business Administration and 40 are addressed to the Communication faculty.if two of these pieces of mail are delivered to the Dean's office by mistake,and the selection is random...

**math**

The manager of a retail store knows that 40% of the customers who enter the store will purchase one or more items and 60% will leave without making a purchase.what is the probability that in a sample of 10 customers,five will buy one or more items? Here,the population consists...

**statistics**

what is the probability that the random variable has a value between 5.3 and 5.7

**History**

19.)With over eight million people, New York City is most heavily populated city in the U.S Between 1800 & 1900, the population of New York increased from about 80,000 to over three million people. In the years after the Civil War, the population of New York City tripled. With...

**statistics**

ATUW Motors is planning to replace the brake pad of its cars with a similar quality brake pads but cheaper. This is part of the company strategy to cut costs but wants to maintain the quality of its cars and parts. The variance of the existing brake pads life time is 29.2 ...

**Maths - Statistics**

A large school in the UK offers its pupils the opportunity to learn several non-English languages. It turns out that: • 55% of pupils in this school choose to learn French; • of the pupils who learn French, 40% also learn German. (a) For pupils in this school, let F denote...

**statistics**

in 2012 it accepted that 41% or less preferred diesel engine needs a high school statistics student studying a randomly selected group of 51 male found that 23 of them prefer diesel-powered vehicle is that student correct and claiming them that males more prefer diesel powered...

**Statistics**

How do I find a P VALUE given the Z statistic using the empirical rule? Doing this by hand

**Statistics**

How do I find a p value given the Z statistic using the empirical rule?

**statistics**

Data has been collected from a representative of a well-defined population to answer the question: "How much money does the average senior male at Normal Community High School have in his pockets at the end of the school day on Friday?" The next step in the study is to: a. ...

**Statistics**

There's 5 multiple choice questions on a quiz. Four choices to each question. Find the probability that the student gets 3 or more questions right. p(x=3) (.25)^3= 0.015 p(x=4) (.25)^4=3.906 p(x=5) (.25)^5=9.765 Do you add them all together to get the overall probability?

**Statistics**

A 10 question test is all multiple choice. Each question has four choices. Determine the mean number of questions answered correctly as well as the standard deviation for the number of correct answers if someone were to guess on all ten questions. So far, I have that the ...

**Statistics**

An IQ is measured with scores that range from 0-200. The means is 100, the standard deviation is 15. Suppose you choose an SRS of 9. What is the probability that the sample will have an average IQ between 105 and 115?

**Statistics**

Use the following information to answer the following questions. IQ is measured with scores that range from 0-200. Thea mean is 100 and the standard deviation in the population is 15. What is the probability that a randomly chosen person has an IQ of 115? Suppose you have a ...

**Statistics**

why using the t statistic may be an appropriate alternative to using a z-score

**statistics**

A store owner receives 12 computers:nine are model A and the rest are model B.if two computers are sold at random,find the probability that one of each model is sold.

**statistics**

A factory finds out that on the average 20% of bolts produced by the given machine will be defective.if 10 bolts are selected at random from the day's production of this machine,find the probability that 1.exactly 2 will be defective. 2. 2 or more will be defective 3. More ...

**statistics**

what is the range of probability

**calculating and Reporting Healthcare 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 Cody's record and each colorworks 7.5 productive hours per day how many ftes will the coding supervisor need

**STATISTICS PLEASE HELP**

An HR manager at a large agricultural equipment company is considering proposingputting the sales staff on 4 day - 10 hours/day work weeks, instead of their current 5day - 8 hours/day week. It is believed that this will decrease the amount of drivingthey must do during a ...

**Statistics**

A flower shop wishes to add the valuable Waimea orchid to its product list. They purchase a large shipment of bulbs from a supplier in Kauai. It is established by Mendelian theory that the predominant colors in the Waimea orchid (blue, red, violet, orange) will occur with the ...

**Statistics**

A marketing researcher decides to test whether coffee drinkers have a favorable view of coffee labeled as “Fair Trade.” He has 15 randomly selected coffee drinkers taste his company’s Morning Blend, then the exact same coffee labeled Fair Trade Blend. They are asked to ...

**Statistics**

What is the critical value in this question? Assume that we randomly sample 200 residents of Indiana and ask them if they favor having the government issue marriage licenses to same-sex couples. 104 say that the do; 96 don’t. Test at the 5% level whether the population ...

**Statistics**

What are some parallels and differences between regression models and time series models? Share some use cases to add to your discussion of the similarities and differences.

**Statistics**

what is seasonality in a time series and how could it impact modeling a response over time?

**Statistics**

How do the 3rd grade boys’ weight in Principal Ben’s school compare to the national average (mean weight = 90, sd =15)? Provide the IV, DV, and best method of analysis

**statistics**

Among 15 metal parts produced in a machine shop, 4 are defective. If a random sample of five of these metal parts is selected, find a) The probability that this sample will contain at least three defectives. b) The probability that this sample will contain at most two defective.

**statistics**

Among 15 metal parts produced in a machine shop, 4 are defective. If a random sample of five of these metal parts is selected, find a) The probability that this sample will contain at least three defectives. b) The probability that this sample will contain at most two defective.

**Statistics**

The home states of a certain group of people are distributed as follows: 54 percent are from MISSOURI, 27 percent are from KANSAS, and 19 percent are from IOWA. (No one in the group had a home state other than one of these three.) (Note: Your answer to the question below ...

**Probability and statistics**

Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial.n=22, x=18, p=0.85, q=.15

**statistics of business**

A telephone company’s goal is to have no more than six monthly line failures on any 100 kilometres of line. The company currently experiences an average of three monthly line failures per 50 kilometres of line. Let x denote the number of monthly line failures per 100 ...

**STATISTICS**

A math teacher observes that on the average 3 students came to their 8-9AM class late. The probability 5 students will be late in their 8-9AM class is ???

**STATISTICS**

A math teacher observes that on the average 3 students came to their 8-9AM class late. The probability 5 students will be late in their 8-9AM class is ????

**STATISTICS**

A math teacher observes that on the average 3 students came to their 8-9AM class late. The probability 5 students will be late in their 8-9AM class is ???

**STATISTICS**

The probability that a certain production process will produce a defective part is 0.20. If a box contains 12 parts, the probability that there will be 6 or 7 defective parts is ??

**STATISTICS**

The probability that a certain production process will produce a defective part is 0.20. If a box contains 12 parts, the probability that it will contain 6 defective parts is?

**STATISTICS**

A coin is tossed 4 times, the probability that all heads and all tails will appear is??

**STATISTICS**

A coin is tossed 3 times and let X be the number of heads appearing. The probability that 1 head will appear iS?

**STATISTICS**

On the average, 6 people per hour use an express teller machine situated inside a commercial complex. What is the probability that, from 3:00-4:00pm on Friday, at most 4 people will use the machine?

**STATISTICS**

On the average, 7 people per hour use an express teller machine situated inside a commercial complex. What is the probability that, from 3:00-4:00pm on Friday, exactly 7 people will use the teller machine?

**STATISTICS**

A store owner complains that, on the average, 3 bottles per case of a certain brand of softdrink are underfilled. Assuming this is correct, find the probability that a randomly chosen case of this drink will contain at least 4 underfilled bottles.

**STATISTICS**

Suppose that airplane engines operate independently in flight and fail with probability 1/5. Assuming that a plane makes a safe flight if at least one-half of its engines run, what is the probability that 4-engine plane has a successful flight?

**STATISTICS**

In a certain city district, the need for money to buy drugs is given as the reason for 65% of all thefts. What is the probability that exactly 2 of the next 4 theft cases reported in this district resulted from the need for money to buy drugs?

**STATISTICS**

A multiple-choice quiz has 15 questions, each with 4 possible answers of which only 1 is the correct answer. What is the probability that a student gets at least 1 correct answer?

**STATISTICS**

A multiple-choice quiz has 15 questions, each with 4 possible answers of which only 1 is the correct answer. What is the probability that a student gets exactly 8 correct answers?

**Applied statistics**

A fireworks show is designed so that the time between fireworks is between one and five seconds, and follows a uniform distribution. a. Find the average time between fireworks. b. Find probability that the time between fireworks is greater than four seconds.

**chemistry/statistics**

replicate water samples were analyzed for water hardness with the following results : 102.2 , 102 .8 ,103.1, 102.3 of calcium trioxocarbonate . calculate the standard deviation of the mean and the coefficient of variation

**statistics**

I don't know what scale to use in plotting the graph of this table; T[k]. D(g/ml) 263. 13.62 273. 13.60 283. 13.57 303. 13.55 313. 13.52 323. 13.42

**Statistics**

Suppose that a researcher wants to estimate a proportion P to within .02 with 95% probability. What is the minimum sample size required?

**statistics**

Suppose that you are in a class of 28 students and it is assumed that approximately 8% of the population is left-handed. (Give your answers correct to three decimal place. Compute the probability that exactly five students are left-handed

**statistics**

Suppose babies born in a large Hospital have a mean weight of 4088 in a variance of 5569. if 128 babies are sample that a random from the hospital what is the probability that the mean weight of the sample babies would differ from the population mean by less than 41 grams ...

**statistics**

In a hospital 6 deliveries have been occurred. The probability that the baby is female equal 0.48 a. Find the probability distribution of the variable representing the number of female babies.

**statistics**

A sign on the gas pumps of a chain of gasoline stations encourages customers to have their oil checked, claiming that one out of four cards need to have oil added. If this is true, what is the probability of the following events? a. One out of the next four cars needs oil. b. ...

**statistics**

From experience, the manager of a bookstore knows that 40% of the people browsing in his store will make a purchase. If on a certain day, 360 people come into the store a) what is the probability that exactly 144 of them make a purchase? b) what is the probability that at more...

**Math (statistics)**

The probability of obtaining heads on a biased coin is 0.4. The coin is tossed 600 times. a. i. Write down the mean number of heads (240) ii. Find the standard deviation of the number of heads (12) b. Find the probability that the number of heads obtained is less than one ...

**statistics**

Find the following: P(z > 2.43)

**Statistics**

a study shows that 16% of household appliances break during any given year. If a person has 4 household appliances, what is the probability that exactly 1 of them will break next year? I just need a formula and I can get it from there.

**Statistics**

In a prior sample of U.S. adults, the Center for Disease Control (CDC), found that 10% of the people in this sample had pinworm but the margin of error for the population estimate was too large. They want an estimate that is in error by no more than 1.5 percentage points at ...

**Statistics**

Suppose you draw a card from a deck (with replacement) 10 times in a row. What is the probability that you get exactly 3 hearts? Round your answer to 3 decimal places.

**Statistics**

In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 25 patients using the drug is selected. Find the mean and standard deviation of patients having a mild side effect. Mean = np = 25(.2) = 5 Ok Standard ...

**statistics**

Case Study Chapter 6 and 7 FOR FULL CREDIT SHOW EQUATIONS USED AND WORK. ELEVATOR CAPACITY: Suppose an elevator has a maximum capacity of 16 passengers with a total weight of 2500 lbs. The mean weight of females is less than the mean weight of males so we will only look at ...

**Statistics**

A bolt manufacturer is using a hypothesis test with α = 0.01 to see if the diameter of their 0.75 cm diameter bolts are being manufactured properly. The goal is to have the average bolt diameter be 0.75 ± 0.0075 cms.

**Statistics Please help me :(**

I have no idea where to even start. Suppose heights of men are normally distributed with a mean 69.0 inches and standard deviation 2.8 inches. How many of a group of 1000 men would you expect to be between 70 and 72 inches tall? Round to the nearest whole number. Suppose ...

**Statistics**

Suppose heights of men are normally distributed with a mean 69.0 inches and standard deviation 2.8 inches. What percent of men are over 6 feet tall? Round to the nearest tenth of a percent. I understanf finding the z score, but I'm not sure how to find the percent.

**Statistics**

Suppose a baseball pitcher throws fastballs 80 % of the time and curveballs 20 % of the time. Suppose a batter hits a home run on 8 % of all fastball pitches, and on 5 % of all curveball pitches. What is the probability that this batter will hit a home run on this pitcher's ...

**Statistics**

Hi, I was studying for the math HL exam but I was stuck on Problem 6. I attached it as an image. imgur. com/a/XY874 There's a space because Jiskha does not let me post links.

**Statistics**

Drug clinical trials are analyzed using hypothesis testing methods. As we’ve discussed, the null hypothesis in the effective stage of such trials is that the drug being tested is ineffective. The alternative, of course, is that the drug is effective. Explain why such tests ...

**Statistics**

Recall that the power (1 – β) of a hypothesis test is the probability that we will reject the null hypothesis given that it is false; that is, the probability that we will correctly reject the null hypothesis. All other things being equal, which of the following changes...

**Statistics**

he level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.7 grams per mile and standard deviation 0.19 grams per mile . (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ?

**Statistics**

TRUE or FALSE: The p-value of a hypothesis test is the probability that the null hypothesisis true given the sample statistic obtained.

**Statistics**

Imagine you're a researcher and you need to perform a one-sided test of an alternative hypothesis. You decide to conduct a significance test at the .05 level. Which of the following ranges of z-scores would make the test statistic significant at .05 (one-tail) but not at .01? ...

**statistics**

Find the number of different selections of 4 letters from the 9 letters of the word HAPPINESS which contain no P's and either one or two S's.

**statistics**

if 3 couples sit in a row of chairs what is the probability that each couple sits together? what is the probability all the women sit together and the men may or may not be in the group? what is the probability that the women sit together and the men sit together?

**statistics**

after rolling 5 dice , what is the probability that all 5 of the values are different? 720/7776

**statistics**

a math class has 50 students , of these 22 students are math majors and 18 students are male. Of the math majors 16 are female. Find the probability that a randomly selected student is male or a math major . my answer 22/50 and 18/50 = 396/50= 7.29

**statistics**

If a random password is 3 letters(a-z) and 1 number (0-9) what is the possibility that the password will have 2 of the same letters? 26x26x26=17576

**Statistics**

If four coins are flipped at once, find the probability that there will be at least 2 heads. Round your answer to 3 decimal places.

**Statistics**

Two high school students took equivalent language tests, one in German and one in French. The student taking the German test, for which the mean was 66 and the standard deviation was 8, scored an 82, while the student taking the French test, for which the mean was 27 and the ...

**Statistics**

A particular fruit's weights are normally distributed, with a mean of 764 grams and a standard deviation of 33 grams. The heaviest 15% of fruits weigh more than how many grams? Give your answer to the nearest gram.

**Statistics**

A random variable x has the following probability distribution: x f(x) 0 0.08 1 0.17 2 0.45 3 0.25 4 0.05

**research statistics**

Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation 9. Develop a 99% confidence interval for the population mean. (Round your answers to 3 decimal places.)

**Statistics**

In a shipment of 21 parts, four of the parts are defective. If three parts are selected at random without replacement, find the probability that : a.) All three parts selected are defective. 4/21*3/20*2/19=.003 b.) None of the tree parts selected are defective. 3/17*2/16*1/15...

**statistics please help!**

Assume an office has two telephones (A and B) with separate lines and different telephone numbers. The probability that telephone A rings when the office is closed is .30. The probability that telephone B rings when the office is closed is .20 What is the probability that A ...

**statistics please help!**

Assume an office has two telephones (A and B) with separate lines and different telephone numbers. The probability that telephone A rings when the office is closed is .30. The probability that telephone B rings when the office is closed is .20. What is the probability that ...

**statistics please help!**

Assume an office has two telephones (A and B) with separate lines and different telephone numbers. The probability that telephone A rings when the office is closed is .30. The probability that telephone B rings when the office is closed is .20 What is the probability that ...

**statistics please help!**

Assume an office has two telephones (A and B) with separate lines and different telephone numbers. The probability that telephone A rings when the office is closed is .30. The probability that telephone B rings when the office is closed is .20. What is the probability that ...