Sunday

June 26, 2016
**Statistics**

The father of a junior high school student wants to determine the most popular book among junior high students. Select the sample with the least potential bias. A. A randomly selected group of 10 book sellers B. A randomly selected group of 30 junior high students C. A ...
*Wednesday, April 13, 2016 by Angela*

**Statistics**

Which is the best fertilizer for Mr. Jimenez’ backyard grass? Select the type of study most appropriate to the question. A. Experimental B. Experimental blinded C. Case-controlled observational D. Observational Answer: B
*Wednesday, April 13, 2016 by Angela*

**Statistics**

A U.S. government report stated that, “With bank interest rates around 1.0%, 8% of wage earners believe it worthwhile to keep money in a savings account. However, at 3.0% interest, 36% of wage earners believe it worthwhile to keep money in a savings account. The margin of...
*Wednesday, April 13, 2016 by Angela*

**Statistics**

A botany student counted 11 blades of grass in one square centimeter of lawn and measured the lawn as a rectangle 61 m by 31 m. She reported that there were 208,010,000 blades of grass in the lawn. The precision of her conclusion: A. correctly represents her measurements. B. ...
*Wednesday, April 13, 2016 by Angela*

**Statistics**

The results of a poll are stated as follows: “Based on a survey of 156 randomly selected students, 90% of the student body of 2870 students agree that no student should have to take final exams in two consecutive exam periods”. If 2578 students actually agree, then ...
*Wednesday, April 13, 2016 by Angela*

**Statistics**

A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for its use and a planned diet for six weeks. The ...
*Wednesday, April 13, 2016 by Angela*

**statistics**

please help me on this; In the mass production of bolts it is found that 5% are defective. Bolts are selected at random and put into packets of ten. A packet is selected at random. Find the probability that it contains: A. no defective bolts, B. three defective bolts, and C. ...
*Wednesday, April 13, 2016 by uta*

**Statistics**

Several states, including California, have passed legislation requiring automakers to sell a certain percentage of zero-emissions cars within their borders. One current alternative is battery-powered cars. The major problem with battery-operated cars is the limited time they ...
*Sunday, April 10, 2016 by Eddy*

**statistics**

The probability of an event could be 16/17.
*Sunday, April 10, 2016 by amy*

**Healthcare Statistics**

It takes approximately 15 minutes to code one record. How many personnel hour would be needed to code 1424 discharges for the month.
*Saturday, April 9, 2016 by Linda*

**Statistics**

After one month of operation, the health information services at community Health Center determined that there were two records misfiled out of the 450 active records. What is the filing accuracy rate for this area.
*Saturday, April 9, 2016 by Linda*

**Statistics**

Calculate the number of new shelving units needed for a medical record filing system based on eight shelves per unit at 36 inches per shelf. The average record size equals 0.30 inches, and the center anticipates seeing 4,500 patients the first year.
*Saturday, April 9, 2016 by Linda*

**Statistics**

If your HIM department has 100,000 active medical records and you received 5,352 requests for records within a six-month period, what is the request rate for the past six months.
*Saturday, April 9, 2016 by Linda*

**Statistics**

A web-site asks users to create a 5-symbol PIN code where first and second symbols are any letters from the English alphabet and next 3 symbols are any digits. How many different PIN codes can be created?
*Saturday, April 9, 2016 by HELP Plz!*

**Statistics**

The Acme Candy Company claims that 60% of the jawbreakers it produces weigh more than .4 ounces. Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 494 jawbreakers that weigh more than .4 ounces?
*Saturday, April 9, 2016 by Chuck*

** Statistics**

If a normally distributed group of test scores have a mean of 76 and a standard deviation of 10. Find the probability that student will earn a grade between 65 and 85
*Saturday, April 9, 2016 by Joe*

**Statistics **

How to find observed frequenty?
*Saturday, April 9, 2016 by Dhelp*

**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
*Friday, April 8, 2016 by luiz*

**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.
*Friday, April 8, 2016 by Anonymous*

**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.
*Friday, April 8, 2016 by chioma *

**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 ...
*Thursday, April 7, 2016 by Jennifer *

**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 ...
*Thursday, April 7, 2016 by Jennifer *

**Statistics**

A card is drawn from a well shuffled deck of 52 cards. Find P (drawing an acre or a 9)
*Thursday, April 7, 2016 by J*

**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 ...
*Thursday, April 7, 2016 by lola*

**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...
*Wednesday, April 6, 2016 by <3*

**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...
*Tuesday, April 5, 2016 by Eddy*

**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 ...
*Monday, April 4, 2016 by John*

**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?
*Monday, April 4, 2016 by John*

**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 ...
*Sunday, April 3, 2016 by Teresa*

**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)
*Saturday, April 2, 2016 by Andrea*

**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 ...
*Saturday, April 2, 2016 by Bravo*

**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...
*Saturday, April 2, 2016 by Ibrahim*

**statistics**

what is the probability that the random variable has a value between 5.3 and 5.7
*Friday, April 1, 2016 by dianne*

**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...
*Wednesday, March 30, 2016 by #FreeGucci*

**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 ...
*Wednesday, March 30, 2016 by Anonymous*

**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 ...
*Tuesday, March 29, 2016 by Jay*

**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...
*Monday, March 28, 2016 by kait*

**Statistics**

How do I find a P VALUE given the Z statistic using the empirical rule? Doing this by hand
*Monday, March 28, 2016 by Sarah*

**Statistics**

How do I find a p value given the Z statistic using the empirical rule?
*Monday, March 28, 2016 by Sarah*

**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 ...
*Monday, March 28, 2016 by michelle*

**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?
*Sunday, March 27, 2016 by Chris*

**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 ...
*Sunday, March 27, 2016 by Mona*

**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?
*Saturday, March 26, 2016 by Jessie*

**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 ...
*Saturday, March 26, 2016 by Jessie*

**Statistics**

why using the t statistic may be an appropriate alternative to using a z-score
*Saturday, March 26, 2016 by Ninoska*

**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.
*Friday, March 25, 2016 by farahan*

**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...
*Friday, March 25, 2016 by farahan*

**statistics**

what is the range of probability
*Thursday, March 24, 2016 by john*

**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
*Thursday, March 24, 2016 by Purple monkey*

**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 ...
*Thursday, March 24, 2016 by Sarah*

**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 ...
*Thursday, March 24, 2016 by John*

**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 ...
*Thursday, March 24, 2016 by John*

**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 ...
*Thursday, March 24, 2016 by Sarah*

**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.
*Thursday, March 24, 2016 by Anonymous*

**Statistics**

what is seasonality in a time series and how could it impact modeling a response over time?
*Thursday, March 24, 2016 by Anonymous*

**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
*Wednesday, March 23, 2016 by Anonymous*

**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.
*Wednesday, March 23, 2016 by akb*

**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.
*Wednesday, March 23, 2016 by akb*

**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 ...
*Tuesday, March 22, 2016 by Mal*

**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
*Tuesday, March 22, 2016 by Holly*

**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 ...
*Monday, March 21, 2016 by Yogeswar*

**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 ???
*Monday, March 21, 2016 by NARUTO*

**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 ????
*Monday, March 21, 2016 by NARUTO*

**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 ???
*Monday, March 21, 2016 by NARUTO*

**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 ??
*Monday, March 21, 2016 by NARUTO*

**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?
*Monday, March 21, 2016 by NARUTO*

**STATISTICS**

A coin is tossed 4 times, the probability that all heads and all tails will appear is??
*Monday, March 21, 2016 by NARUTO*

**STATISTICS**

A coin is tossed 3 times and let X be the number of heads appearing. The probability that 1 head will appear iS?
*Monday, March 21, 2016 by NARUTO*

**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?
*Monday, March 21, 2016 by NARUTO*

**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?
*Monday, March 21, 2016 by NARUTO*

**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.
*Monday, March 21, 2016 by NARUTO*

**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?
*Monday, March 21, 2016 by NARUTO*

**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?
*Monday, March 21, 2016 by NARUTO*

**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?
*Monday, March 21, 2016 by NARUTO*

**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?
*Monday, March 21, 2016 by NARUTO*

**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.
*Sunday, March 20, 2016 by Nandini*

**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
*Saturday, March 19, 2016 by austin*

**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
*Saturday, March 19, 2016 by austin*

**Statistics**

Suppose that a researcher wants to estimate a proportion P to within .02 with 95% probability. What is the minimum sample size required?
*Saturday, March 19, 2016 by Alfonzo*

**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
*Friday, March 18, 2016 by Kyra*

**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 ...
*Thursday, March 17, 2016 by Marcus *

**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.
*Thursday, March 17, 2016 by Nada*

**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. ...
*Thursday, March 17, 2016 by April*

**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...
*Wednesday, March 16, 2016 by McKinsley*

**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 ...
*Wednesday, March 16, 2016 by Myra*

**statistics**

Find the following: P(z > 2.43)
*Wednesday, March 16, 2016 by Ray*

**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.
*Saturday, March 12, 2016 by T*

**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 ...
*Friday, March 11, 2016 by Sara*

**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.
*Friday, March 11, 2016 by Sara*

**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 ...
*Friday, March 11, 2016 by Ray *

**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 ...
*Monday, March 7, 2016 by Chris*

**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.
*Monday, March 7, 2016 by Sarah*

**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 ...
*Monday, March 7, 2016 by Anonymous*

**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.
*Sunday, March 6, 2016 by Anonymous*

**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'...
*Sunday, March 6, 2016 by Nicole *

**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.
*Sunday, March 6, 2016 by cory*

**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 ...
*Sunday, March 6, 2016 by Sarah*

**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 ...
*Sunday, March 6, 2016 by Sarah*

**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 ?
*Saturday, March 5, 2016 by zoolo*

**Statistics**

TRUE or FALSE: The p-value of a hypothesis test is the probability that the null hypothesisis true given the sample statistic obtained.
*Saturday, March 5, 2016 by Sara*