Thursday

December 8, 2016
**STATISTICS**

Suppose that a researcher is interested in estimating the mean systolic blood pressure, , of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate . Assuming that the standard deviation of the ...

*Monday, October 24, 2016 by RILEY*

**STATISTICS**

A study of college football games shows that the number of holding penalties assessed has a mean of penalties per game and a standard deviation of penalties per game. What is the probability that, for a sample of college games to be played next week, the mean number of holding...

*Monday, October 24, 2016 by RILEY*

**statistics**

The current rate of success is 70% for 200 students. When the new test is implemented, the rate increases to 85% for the 50 students who pass the test and are allowed into the program. Is this difference significant?

*Sunday, October 23, 2016 by pamela*

**Statistics**

Assume a study of 500 randomly selected school bus routes revealed 480 arrived on time. Is it significant for a school bus to arrive late?

*Sunday, October 23, 2016 by Tracy*

**Statistics **

A dice rolling just once What is probability of given the face is odd, it is a 1?

*Sunday, October 23, 2016 by Rashad Suleymanli*

**Statistics**

Write an inequality that represents all of the data values X, that fall between the values of the mean +/- the standard deviation

*Friday, October 21, 2016 by Mary*

**Health!**

Statistics of Suicide regarding Antisocial Personality Disorder

*Friday, October 21, 2016 by J*

**science**

identify the best way to display statistics in a research report

*Friday, October 21, 2016 by luma*

**math**

How many paths spell STATISTICS using Pascal's triangle? S T T A A A T T T T I I I S S T I I C C C S S Thanks in advance

*Wednesday, October 19, 2016 by Jenna*

**statistics **

A naturalist leads whale watch trips every morning in March. The number of whales seen has a Poisson distribution with a mean of 2.1 Find the probability that on a randomly selected trip, the number of whales seen is 3. Round to four decimal places.

*Tuesday, October 18, 2016 by anonymous *

**statistics**

An unfair coin has a probability of coming up heads of 0.55 the coin is tossed 4 times. What is the probability that it lands heads at least once?

*Monday, October 17, 2016 by gio*

**Statistics**

A tobacco company claims that the nicotine content of its "light" cigarettes has a mean of milligrams and a standard deviation of milligrams. What is the probability that randomly selected light cigarettes from this company will have a total combined nicotine content...

*Sunday, October 16, 2016 by mike*

**Statistics**

If there are 6 red disks numbered 1 through 6, and 4 yellow disks numbered 7 through 10, find the probability of selecting a yellow disk given that the number selected is less than or equal to 4 or greater than or equal to 8.

*Sunday, October 16, 2016 by SHEYLAMIEL*

**Statistics **

A study of 29 female Sumatran elephants provided a 95% confidence interval for the mean shoulder height as (197.2, 235.1) cm. Consider a new study to estimate the mean shoulder height of male Sumatran elephants. Assuming the standard deviations of shoulder heights are similar ...

*Saturday, October 15, 2016 by Tabetha*

**Statistics**

A science teacher gives a test with 15 questions. This teacher is a hard grader. The teacher assigns points in the following manner: a correct answer = +1 point, an incorrect answer = -1 point, no answer = 0 points. So scores on the test could range from +15 to -15. The ...

*Friday, October 14, 2016 by sam*

**Statistics**

Suppose that 40 students take a quiz and everyone in the class scores an 80. The standard deviation of scores for this quiz is: 80 2 0

*Friday, October 14, 2016 by sam*

**Statistics**

A college statistics class conducted a survey of how students spend their money. They asked 25 students to estimate how much money they typically spend each week on fast food. They determined that the mean amount spent on fast food is $31.52 with a standard deviation of $21.60...

*Friday, October 14, 2016 by sam*

**Statistics**

suppose that 80% of all 18 year olds play basketball. if a sample size of 4 is taken, find the probability that the sample proportion lies within and including one standard deviation of the population proportion

*Friday, October 14, 2016 by Jay*

**Statistics**

The probability a company will hire a new employee is 0.38. Suppose three companies are randomly selected. (a) Find the probability all three companies will hire a new employee. (b) Find the probability at least one company will hire a new employee. (c) Find the probability ...

*Wednesday, October 12, 2016 by Steve*

**statistics**

consider shuffling a standard 52 deck of cards and drawing one which is black. what is the probability that the card is a 4,5,or 6

*Tuesday, October 11, 2016 by NJABU*

**statistics**

According to a survey, 21% of motorists in a large city are uninsured. Suppose that currently 21% of all motorists in this city are uninsured. Two motorists are selected at random from this city. Let x denote the number of motorists in this sample of two who are uninsured. ...

*Monday, October 10, 2016 by Anonymous*

**Statistics **

P=8.12E-4<=.01 Why is 8.12 less than .01

*Monday, October 10, 2016 by Help *

**Statistics/Probability**

An observer has measured the starting position of a toy vehicle as xs = 9.3 ± 0.2 m and the finishing position as xf = 14.4 ± 0.3 m. Calculate the displacement and the error in the displacement. I am not sure where to start at all.

*Monday, October 10, 2016 by Erica*

**Statistics**

Four cards are chosen at random. What is the probability that at least 2 are J's? How is this problem computed? Using Combinations or permutations?

*Sunday, October 9, 2016 by Pete*

**Statistics **

If $3000 is invested at 3% compounded monthly how much in 9 years

*Sunday, October 9, 2016 by Anonymous*

**Statistics **

If $3000 is invested at 3% compounded monthly how much in 9 years

*Sunday, October 9, 2016 by Anonymous*

**Statistics**

Scores on an SAT test have a mean of μ = 1026 and a standard deviation of σ = 209. Compute the margin of error of the sample mean for a random sample of 100 students.

*Sunday, October 9, 2016 by Allie*

**Statistics**

The weight of luggage that a randomly selected airline passenger brings onto a flight has a mean of 35 lbs and a standard deviation of 6 lbs. If a flight has 80 passengers, within what range would the average weight of their luggage fall with 95% certainty?

*Sunday, October 9, 2016 by Allie*

**Statistics**

Suppose systolic blood pressure (the higher of the two blood pressure readings) of a large group of individuals is normally distributed. If the mean is 122 and the standard deviation is 20, then

*Sunday, October 9, 2016 by JOHN *

**Statistics**

a ball rolls off a table and falls 0.80 m to the floor, landing with a speed of 4.5 m/s. 1. What was the initial speed of the ball? 2. What initial speed must the ball have if it is to land with a speed of 5.8 m/s? 3. What is the magnitude of the acceleration of the ball just ...

*Sunday, October 9, 2016 by Charlie*

**Math**

This is your question number 2 for today, out of 5 allowed. Here's your question for category 'Probability-and-statistics'. 16 teams decided to participate in a football competition. In the preliminary round, the 16 teams will br divided into 4 groups and they have...

*Sunday, October 9, 2016 by Aina*

**Statistics and **

In a survey of 144 pet owners, 31 said they own a dog, and 91 said they own a cat. 14 said they own both a dog and a cat. How many owned neither a cat nor a dog?

*Saturday, October 8, 2016 by Josh *

**STATISTICS**

A certain disease has an incidence rate of 0.6%. If the false negative rate is 4% and the false positive rate is 4%, compute the probability that a person who tests positive actually has the disease

*Friday, October 7, 2016 by Anonymous*

**Statistics**

Can anyone help me with this? Which of the following statements is true about a 99% confidence interval? a. The interval contains 99% of the population. b. The probability that the population mean is in the interval is 99%. c. The interval is wider than a 95% confidence ...

*Friday, October 7, 2016 by Angel*

**statistics**

A STAT 200 instructor is interested in whether there is any variation in the final exam grades between her two classes Data collected from the two classes are as follows: Her null hypothesis and alternative hypothesis are: (a) Determine the test statistic. Show all work; ...

*Friday, October 7, 2016 by chris*

**Statistics **

A doctor want to estimate the HDL cholesterol of all 20- to 29- year old females. how many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confindence assuming s=10.5. Suppose the doctor would be content with 90% confidence. How does the decrease ...

*Friday, October 7, 2016 by Makaila*

**Statistics**

Find the minimum sample size n needed to estimate u for the given values of c, s, & E. c=0.98, s=6.5, & E=1.?

*Friday, October 7, 2016 by Makaila*

**Statistics**

It is not surprising that babies with low birth weights are at risk for developmental difficulties, but extraoridinarily large babies also face a higher than noraml risk of medical problems. In the United States the average full term single birth baby has a weight of 3.4 kg ...

*Friday, October 7, 2016 by Kelsi*

**Statistics**

Let's say that your average monthly charge is normally distributed with a mean of $500 and a standard deviation of $100. The credit card company will call anytime your purchases for the month exceed the 99th percentile. What is the dollar amount beyond which you will get a...

*Thursday, October 6, 2016 by Stacy *

**Statistics **

If a basketball player has a shooting percentage of 60% , find the probability that the player will make at least 2 of her next 9 shots?

*Wednesday, October 5, 2016 by Hannah Jorgensen*

**Statistics **

If a basketball player has a shooting percentage of 60% , find the probability that the player will make at least 4 of her next 6 shots?

*Wednesday, October 5, 2016 by Hannah Jorgensen*

**damon-steve- help statistics**

Statistics City XYZ has 8800 registered voters. There are two candidates: Peter and Paul. A poll of 600 randomly selected registered voters was conducted. We know that 331 said they'd vote for Peter and 251 said they'd vote for Paul. We also know that 18 were undecided...

*Tuesday, October 4, 2016 by sam*

**Statistics**

Consider the following frequency distribution of daily sales for a shop that was kept for the months of November and December in 2013. Daily Sales ($) 60-70 70-80 80-90 90-100 100-110 110-120 Number of days 5 11 22 13 7 3 a. From this frequency distribution, (i) draw a ...

*Saturday, October 1, 2016 by Nathan*

**Statistics**

Bill,mary,and Joe belong to a club of nineteen people. A committee of twelve is to be selected at random from the membership. How many different arrangements are possible? How many of these committees will contain Bill,Mary, and Joe at the same time?

*Thursday, September 29, 2016 by Charles*

**Statistics**

Bill, Mary, and Joe belong to a club of nineteen people. A committee of twelve is to be selected at random from the membership. How many different arrangements are possible. How many of these committees will contain Bill, Mary and Joe at the same time?

*Thursday, September 29, 2016 by Charles*

**Statistics**

Two committees, one with six and one with seven people, are to be selected from a group of eighteen people, with no one person serving on both committees at the same time. In how many ways can this be done?

*Thursday, September 29, 2016 by Charles*

**Statistics**

True or False? If a correlation is negative, then as it becomes even more negative, r2 increases.

*Thursday, September 29, 2016 by Christopher*

**statistics**

An architect estimates that the average height of the buildings of 30 or more stories in Suva is at least 500 feet. A random sample of 12 buildings is selected, and the heights in feet are shown. At = 0.025, is there enough evidence to reject the claim? 634 385 411 ...

*Thursday, September 29, 2016 by talei*

**Statistics **

23 children born. What is the probability that 22 are boys & 1 is a girl?

*Wednesday, September 28, 2016 by Kevin*

**Math**

Your statistics instructor administers a test having five multiple-choice items with four options each. List the ways in which one can guess correctly on exactly four items on this test. Are there 24 ways, because: 4! (4)(3)(2)(1) =24?

*Wednesday, September 28, 2016 by Debbie*

**Statistics**

Obtain the area under the standard normal curve to the right of z=1.32 Round your answer to four decimal places. A = the tolerance is +/-5%

*Wednesday, September 28, 2016 by Maryan*

**Language Arts **

How does the writer support the statement that dental floss promotes good dental health? With personal opinions with opinions from experts with facts that and statistics with sales information

*Wednesday, September 28, 2016 by Anonymous*

**Statistics**

How can i show that event A and B are neither mutually exclusive nor independent. And what does it mean.

*Wednesday, September 28, 2016 by Judge*

**Statistics **

The events A and B are such that P(A\B)=0.4, P(B\A)=0.25 and P(A n B)=0.12 compute the following; 1. P(A) and p(B) 2. P(A n B') and P(A' n B) 3.P(A u B)and P[(A u B)']

*Wednesday, September 28, 2016 by Mina*

**statistics**

Two dice are rolled, find the probability that the sum is less than 6 (Leave your answer as a number between 0 and 1. Round to 4 decimal places).

*Wednesday, September 28, 2016 by Tim*

**Statistics**

Your statistics instructor administers a test having five multiple-choice items with four options each. List the ways in which one can guess correctly on exactly four items on this test. Are there 24 ways, because: 4! (4)(3)(2)(1) =24?

*Tuesday, September 27, 2016 by Debbie*

**statistics**

Consider the following data on lengths of 30 pieces of metal. 18 26 15 17 7 27 24 17 10 17 23 29 28 18 10 23 16 6 12 26 5 12 23 22 24 14 16 26 19 22 a. Define an outlier. Give an example of an outlier from the above data set. [3] b. (i) Calculate and interpret the: range, mean...

*Tuesday, September 27, 2016 by TINASHE*

**Statistics**

The amount of Jen's monthly phone bill is normally distributed with a mean of $55 and a standard deviation of $12. Calculate the z score for each scenario. What percentage of her phone bills are above 79? What percentage of her phone bills are between $31 and $79. What ...

*Sunday, September 25, 2016 by Amy Penn*

**statistics **

x is normally distributed and that sample of 20 yields a mean of 42 and a variance of 25 test the hypothesis that the population standard deviation is 8 at 5% significance level.

*Sunday, September 25, 2016 by Sasanka*

**Stats, Statistics, Math**

A Statistics professor assigned 10 quizzes over the course of the semester. He wanted to see if there was a relationship between the total mark of all 10 quizzes and the final exam mark. There were 229 students who completed all the quizzes and wrote the final exam. The ...

*Saturday, September 24, 2016 by Papi*

**Statistics**

Direct mail advertisers send solicitations ("junk mail") to thousands of potential customers in the hope that some will buy the company's product. The response rate is usually quite low. Suppose a company wants to test the response to a new flyer ...

*Thursday, September 22, 2016 by Iresse*

**Statistics**

Direct mail advertisers send solicitations ("junk mail") to thousands of potential customers in the hope that some will buy the company's product. The response rate is usually quite low. Suppose a company wants to test the response to a new flyer ...

*Thursday, September 22, 2016 by Iresse*

**Statistics**

Consider the following data set: 3, 4, 6, 7, 9, 9, 11. Identify a number you could add to the set to keep the mean equal to the median. Please help me out. I have no idea how to find this and my lesson doesn't explain how to do it either. I already know that the mean and ...

*Thursday, September 22, 2016 by Me*

**Statistics**

The weight of 100 females aged 15 to 20 years has a mean of 120 pounds and a variance of 36 pounds. How many of the students has a weight less than 110 pounds?

*Thursday, September 22, 2016 by Chyrie lhu*

**statistics**

A test consists of 5 multiple questions each of which 3 answers are given, only 1 of which is correct.for each correct answer a candidate gets 2 marks but loses 1 mark for each incorrect answer.draw up table to show all possible marks and a probability associated with each ...

*Thursday, September 22, 2016 by faith*

**statistics**

Assume the lifespan of light bulbs manufactured by Bright Inc. can be modeled with a normal distribution with a mean of 300 days and a standard deviation of 40 days. 70% of light bulbs produced by Bright Inc. survive longer than how many days?

*Wednesday, September 21, 2016 by Saralynn Niealsen*

**Statistics **

In a sample of 20 men, the mean height was 178 cm. In a sample of 30 women, the mean height was 164 cm. What was the mean height for both groups put together? The answer I got by adding the two means and dividing them by 2 is 171 but it is wrong, it must be 169.9, how can I ...

*Tuesday, September 20, 2016 by W*

**college- practical statistics**

Five coins are tossed 3200 times find the frequencies of distribution of heads & tails & tabulate the results. Calculate the mean number of success & the standard deviation.

*Monday, September 19, 2016 by sathya*

**Statistics **

From a sample with n equals=24, the mean number of televisions per household is 3 with a standard deviation of 1 television. Using Chebychev's Theorem, determine at least how many of the households have between 1 and 5 televisions.

*Sunday, September 18, 2016 by Addison*

**statistics**

A population of N = 10 scores has a mean of μ = 24. If one person with a score of X = 42 is removed from the population, what will be the value for the new mean?

*Friday, September 16, 2016 by patrick*

**statistics**

In general, increasing the sample size (for example, from n = 4 to n = 50) will ____ the risk of a Type I error. (Assume alpha is held constant at .05.) Select one: a. decrease b. increase c. have no influence on

*Friday, September 16, 2016 by anna*

**stats**

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 range = 60 mode = 165 variance = 324 median = 170 The coefficient of variation equals: a.0.1125% b.11.25% c.203.12% d.0.20312% Do I have to find the ...

*Thursday, September 15, 2016 by Ana*

**statistics**

The weekly study times for all students in a school are normally distributed with μ = 18 hours and σ = 6 hours. If 36 students are randomly selected, find the probability that their mean study time is greater than 20 hours. My work: 20-18/(6/√36)=2/(6/6)=2/1=2...

*Thursday, September 15, 2016 by Judy*

**Statistics**

A signal is transmitted over a noisy channel. It is known that the signal will be correctly received with probability 0.797. If 3 copies of the signal are independently sent over this channel, what is the probability that at least one of them is received correctly? My thought ...

*Wednesday, September 14, 2016 by Janea*

**Statistics**

A social worker is involved in a study about family structure. She obtains information regarding the number of children per family for a certain community from the census data. Identify the variable of interest, determine whether it is discrete or continuous and list some ...

*Tuesday, September 13, 2016 by AprylB*

**Statistics**

The Virginia Department of Social Services collected information on 25 Virginia Supplemental Nutrition Assistance Program (SNAP, formerly Food Stamps) beneficiaries and found that their average monthly food expenditure was $160. The average monthly food expenditure for SNAP ...

*Monday, September 12, 2016 by REDGY22*

**Statistics**

Free Throw Freddie is an 80% free throw shooter. At the end of practice he shoots until he makes 10 shots. a) What is the probability that Freddie makes 10 in a row? b) What is the probability that Freddie needs 15 or more attempts? I understand how to do part a), but I'm ...

*Sunday, September 11, 2016 by Zach*

**Statistics**

I have a bag with 2 different kinds of objects: 11 cubes, 16 spheres. If I randomly pick from the bag 5 of these objects without return any of it, what is the probability of getting at least 1 of each kind?

*Saturday, September 10, 2016 by Nathan*

**statistics**

the response to a question has three alternative a, b, c, a sample of 120 responses provides 60 a, 24 b, 36 c. show the frequency and relative frequency distributions

*Thursday, September 8, 2016 by susu*

**statistics**

A restaurant menu has 5 kinds of soups, ten kinds of main courses, six kinds of desserts, and eight kinds of drinks. If a customer selects one item from each category, how many different outcomes are possible?

*Wednesday, September 7, 2016 by jelai*

**statistics**

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.

*Monday, September 5, 2016 by Barbara*

**Statistics**

The average score for a business examination comprising 300 students is 54%. If the marks are normally distributed with a standard deviation of 8%, determine the number of students scores above 70%.

*Monday, September 5, 2016 by Dmaster*

**Statistics**

A movie theater has a super ultra combo meal. It includes the option of a large popcorn, a soda, a slice of pizza, and a box of candy. There are 12 types of toppings for the popcorn, including no topping. There are 5 types of toppings for the pizza, including no topping. The ...

*Monday, September 5, 2016 by Nathan*

**Statistics**

In a group of 54 candidates, 16 are female and the remaining are male. If four are to be randomly selected, what is the probability that there will be only female candidates selected?

*Sunday, September 4, 2016 by Jason*

**Statistics**

The probability that a randomly chosen person in Botswana is 65 or older is approximately 0.2. a) What is the probability that, in a randomly selected sample of 6 people, exactly 4 of them are 65 or older. If X IS THE NUMBER of people of age 65 or older in a sample of 6, ...

*Sunday, September 4, 2016 by mbambo*

**Pathway to Statistics**

a. What value of T represents the temperature that is 16°F below zero? b. A student says that T represents only positive numbers and zero, because there is no negative sign. Is the student correct? Explain

*Thursday, September 1, 2016 by Sam*

**Statistics**

How do I answer: A normal distribution has a standard deviation equal to 39. What is the mean of this normal distribution if the probability of scoring above x = 209 is 0.0228

*Thursday, September 1, 2016 by Brian*

**AP statistics**

A group of students were asked to guess the width of the room in feet, measured to the nearest foot (1 meter = 3.28 feet, to 2 decimal places). Construct a back to back stemplot from these two datasets. How will you overcome the problem that different units are used in the two...

*Tuesday, August 30, 2016 by Leah*

**Statistics **

A poll of a random sample of 100 UNAM students revealed that 82 are football fans and 62 are rugby fanatics draw a venn diagram

*Monday, August 29, 2016 by Raphael*

**Statistics**

Of the 40 students in a gym class, 13 played volleyball, 12 ran track (4 of whom did a push up), and the remainder were absent. A.) What proportion of the class ran track? B.) What percentage played volleyball? C.) What percentage of the runners did a push up? D.) What ...

*Thursday, August 25, 2016 by Daisy*

**statistics**

Select the TWO options that are TRUE statements about two-sample t-tests. Select one or more: The same formula is used for the ESE (estimated standard error) in the two-sample t-test with a common variance and the two-sample t-test with unequal variances. A researcher has ...

*Tuesday, August 23, 2016 by mina*

**statistics**

a bag contains 4 blue marbles,6 red marbles, 10 yellow marbles and 6 green marbles.What is the probability of not drawing a red marble?

*Tuesday, August 23, 2016 by dennis*

**statistics**

Select the TWO options that are TRUE statements about two-sample t-tests. Select one or more: The same formula is used for the ESE (estimated standard error) in the two-sample t-test with a common variance and the two-sample t-test with unequal variances. A researcher has ...

*Sunday, August 21, 2016 by mina*

**Business statistics**

You chose a simple random sample of 300 guests you develop a 95 percent confidence interval estimate you found the following 325 and 32 determine the standard error of the sampling distribution determine the critical value z from the standard normal table compute the ...

*Sunday, August 14, 2016 by Kim*

**Statistics**

Survey of 115 families chosen at random, having 5 children it was observed that the distribution was as follows The 5 children are girls is 6 There is one boy and four girls is 18 There are two boys and three girls is 35 There are three boys and two girls is 30 There are four ...

*Saturday, August 13, 2016 by Huruva Nomore*

**probability statistics**

how many bridge hands are possible containing 4 spaders, 6 diamonds , 1 club and 2 heart?

*Saturday, August 13, 2016 by jamie*

** probability statistics**

how many numbers between 4000 and 7000 can be choosen using digita 0,1,2,3,4,5,6,7 and 8 if each digit must not be repeated in any numbers?

*Friday, August 12, 2016 by jhenny*

**statistics**

how many arrangements can be made from the word MATHEMATICS when all are taken at a time ?

*Friday, August 12, 2016 by jella*

**math**

Based on the data collected by the National Centre for health Statistics and made available to the public in the Sample Adult database, it was found that the percentage of adults who have at some point in their life been told that they have hypertension was 15%. Suppose that a...

*Thursday, August 11, 2016 by lucia*

**probability statistics**

A jar contains 6 red, 7 white, and 7 blue marbles. If a marble chosen at random. Find the following probabilities? A)P(red) B)P(white) C)P(red or blue) D)P(red and white)

*Wednesday, August 10, 2016 by charles*