Sunday
December 4, 2016

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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

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 ....
Friday, March 4, 2016 by Jim

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.
Friday, March 4, 2016 by Zeest

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?
Thursday, March 3, 2016 by brittaney

statistics
after rolling 5 dice , what is the probability that all 5 of the values are different? 720/7776
Thursday, March 3, 2016 by brittaney

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
Thursday, March 3, 2016 by brittaney

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
Thursday, March 3, 2016 by brittaney

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.
Wednesday, March 2, 2016 by Hunter

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 ...
Wednesday, March 2, 2016 by Anonymous

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.
Monday, February 29, 2016 by Bailey

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
Sunday, February 28, 2016 by Donzella

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.)
Saturday, February 27, 2016 by myke

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...
Friday, February 26, 2016 by Grace

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 ...
Thursday, February 25, 2016 by Alondra

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 ...
Thursday, February 25, 2016 by Alondra

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 ...
Thursday, February 25, 2016 by Alondra

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 ...
Thursday, February 25, 2016 by Alondra

Statistics for the Behavioral Sciences
Complete an independent project, collect data from your observation experiment and perform a one-way, between-subjects ANOVA on the data using the definitional formula.Include the following: 1. description of research project that includes the operational definition for the ...
Thursday, February 25, 2016 by Pamela

statistics please help!
If 3 cards are drawn with replacement from a shuffled deck, what is the probability that at least one of them will be a heart
Thursday, February 25, 2016 by Denise

statistics please help!
If 3 cards are drawn with replacement from a shuffled deck, what is the probability that none of the 3 will be hearts?
Thursday, February 25, 2016 by Denise

statistics please help!
If 3 cards are drawn with replacement from a shuffled deck, what is the probability that all 3 will be hearts?
Thursday, February 25, 2016 by Denise

statistics
Identify the level of measurement of the data and explain what is wrong with the given calculation. In a set of data, movie ratings are represented as 100 for 1 star, 200 for 2 stars, and 300 stars for 3 stars. The average (mean) of the 527 movie ratings is 231.2. I got ...
Thursday, February 25, 2016 by Anonymous

Statistics
The mean grade in this class last semester was 78.3, and the variance was 49 . The distribution of grades was unimodal and symmetrical. Using this information determine the probability that “Joe”, a random student you know nothing about, other than the fact that they...
Thursday, February 25, 2016 by Francisco

statistics
If p(A)=.50, p(B)=.60, and p(A and B)=.30, Are A and B mutually exclusive events? and independent events?
Thursday, February 25, 2016 by Nelly

statistics
if a die is tossed four times what is the probability of getting at least one six
Thursday, February 25, 2016 by Nelly

statistics
if a die is tossed four times what is the probability of getting anything but a five on every toss
Thursday, February 25, 2016 by Nelly

statistics
if a die is tossed four times what is the probability of getting three odd numbers
Thursday, February 25, 2016 by Nelly

statistics
if a die is tossed four times what is the probability of getting one six
Thursday, February 25, 2016 by Nelly

statistics
5 students go to school one of which is known to be late; in fact he is late 22% of the time. What is the probability that he will not be late for school.
Wednesday, February 24, 2016 by Sam

statistics
5 cards are drawn out of a regular deck without replacement; you win if you get at least one red card. What is the probability of getting at least one red card?
Wednesday, February 24, 2016 by Shawn

Statistics
To win one version of the New York State lottery, one must correctly select 5 numbers from 49 numbers. How many different selections are possible if: ~ The order in which the selection is made does not matter? ~ The order of selection does matter?
Wednesday, February 24, 2016 by Ana

statistics
The second moment about mean oftwo distributions are 13.76 and 63.0 while the fourth moment about the men are 528.06 and 9500 respectively which of distribution is 1 leptokuric [2] mesokuric [3] platykurtic
Monday, February 22, 2016 by shumaila

statistics
Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4 140.42 140.5 141.27 ...
Sunday, February 21, 2016 by hana

statistics
state whether the quantity described is a parameter or a statistic and give the correct notation. Correlation between height and weight for players on the 2010 Brazil World Cup team, using data from all 23 players on the roster. thanks
Sunday, February 21, 2016 by hana

statistics
Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4 140.42 140.5 141.27 ...
Sunday, February 21, 2016 by vicke

statistics
Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4 140.42 140.5 141.27 ...
Saturday, February 20, 2016 by Anonymous

Statistic
Your search for statistics test questions a professor is trying to convince her colleagues that peer tutoring works. she compares the results of students in two classes one with and one without the peer tutoring. for the non-tutored group the mean score fore for 35'...
Friday, February 19, 2016 by Dhelp

statistics
Minutes 126.53 127.27 130 130.35 130.4 130.58 130.87 131.18 131.98 132.55 133.28 133.42 133.43 133.55 133.65 134 134.37 134.62 134.73 135 135.95 136.12 136.17 136.23 136.28 137.7 137.83 137.93 138.18 138.25 138.43 138.67 139.13 139.72 140.25 140.38 140.4 140.42 140.5 141.27 ...
Friday, February 19, 2016 by Anonymous

statistics
Suppose the temperature of a cup of coffee is normally distributed with a mean of 142 degress F. If a cup of coffee has a z score of 1.5, which of the following is true?
Friday, February 19, 2016 by PLZ HELP

Statistics
The distribution of student loan amounts for students is normally distributed ranging from zero to $100,000. Use your knowledge of the Empirical Rule to approximate the standard deviation of the dataset? A) approximately $21,000 B) approximately $12,500 C) approximately $19,...
Friday, February 19, 2016 by Anonymous

Statistics
If, for a given sample size, 10% of all possible confidence intervals do not contain the unknown population parameter value, what is your confidence level?
Friday, February 19, 2016 by Anonymous

Statistics
Country Insurance wants to estimate the cost of damage to cars due to accidents. The population standard deviation of the cost is assumed at $200. They want to estimate the mean cost using a 95% confidence interval with a maximum margin of error of $10. What is the minimum ...
Friday, February 19, 2016 by Anonymous

Statistics
ATM transaction times are normally distributed with a mean of 150 seconds and a standard deviation of 45 seconds. What is the probability a person takes less than 60 seconds to complete their transaction?
Friday, February 19, 2016 by Anonymous

statistics
Two cards selected from standard deck of 52 cards. The first is replaced before second card selected. Find the probability of selecting a diamond and then a king
Thursday, February 18, 2016 by tim

Statistics
The following is a histogram (right skewed) of the first ten terms of a geometric distribution with p = .4. The mean of this distribution is 2.5 and the standard deviation is approximately 1.93. What's the shape of the distribution of sample means for simple random samples...
Thursday, February 18, 2016 by Jim

Statistics
What is the difference between the population distribution, the distribution of the same, and the sampling distribution and what are the formulas to get the normal distribution of each?
Tuesday, February 16, 2016 by Sara

statistics
FBM 124 class consists of 10 male and 12 female students. Two students were chosen to represent the university to an international forum. Compute the probability of choosing (a) two female students (b) no more than 1 male student c)same genders students
Tuesday, February 16, 2016 by Anonymous

Statistics
A volunteer ambulance service handles 0 to 5 service calls on any given day. The probability distribution for the number of service calls is as follows: one column has number of service calls (X) those numbers are 0 1 2 3 4 5. The next column Probability P (X) those numbers ...
Saturday, February 13, 2016 by Karen

Statistics
A sample of size 16 is taken from a normally distributed population with a mean of 12 and a standard deviation of 3. The probability that the sample mean is equal to 12 is a. 1 b. 0.5 c.-0.5 d.0 please explain
Friday, February 12, 2016 by Sara

statistics
Scores: 5,2,4,2 ΣX-2 Σ(X-2) Σ(X-2)^2 can you show me a better idea how to solve this thanks
Thursday, February 11, 2016 by bob

Statistics
When a new machine is functioning properly, only 2% of the items produced are defective. If 5 parts are randomly selected from this production process, what is the probability that at most 1 defective item is in the sample?
Wednesday, February 10, 2016 by lonestar college

Statistics
2.5 Points 30% of the fifth grade students in a large school district read below grade level. The distribution of sample proportions of samples of 100 students from this population is normal with a mean of 0.30 and a standard deviation of 0.045. Suppose that you select a ...
Wednesday, February 10, 2016 by Amy

statistics
A play contains 15 speaking roles, 10 of them female and 5 male. If the director can choose among 16 female actors and 9 male actors to fill the roles, how many different casts are possible? (NOTE: A cast includes BOTH the actor AND the role that they play.) I'm just ...
Monday, February 8, 2016 by McKinsley

Statistics
We are managing a large soy bean farm. To estimate our revenues for the coming year, we need to estimate our crop yield. Soy bean yields are measured by pods/plant. We are planning for a yield of 40 pods/plant. a. We take a random sample of 64 soy bean plants and get a sample ...
Monday, February 8, 2016 by Sara

Statistics
A school experiments with two teaching approaches for mathematics. In one classroom the material is taught using lectures only. In the other classroom lectures are mixed in with the use of manipulatives, computers, and collaborative activities. Do the data below support the ...
Monday, February 8, 2016 by Denise

Statistics
A school experiments with two teaching approaches for mathematics. In one classroom the material is taught using lectures only. In the other classroom lectures are mixed in with the use of manipulatives, computers, and collaborative activities. Do the data below support the ...
Monday, February 8, 2016 by Denise

statistics
A sign is posted in an elevator stating that the maximum number of people allowed is 25, and that the maximum weight capacity is 4000lbs. Suppose the distribution of the variable Weight (among the population using the elevator) is normal with mean 150lbs and standard deviation...
Sunday, February 7, 2016 by Kara

statistics
1. Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and a standard deviation of 4. Do not use the web calculator to answer the following questions. Instead, use the Z distribution table below and ...
Saturday, February 6, 2016 by Anonymous

statistics
the ages of the members of a gym have a mean of 44 years and a standard deviation of 12 years. what can you conclude from Chebyshev's theorem about the percentage of gym members aged between 26 and 62?
Saturday, February 6, 2016 by dianne

statistics
"using the descriptive statistics for the weight of the babies in ounces, suppose a friend of yours has given birth to a 10 pound 3 ounce baby"
Saturday, February 6, 2016 by Perry

Statistics
A distribution of test scores of 600 examinees follows a normal distriburion with an everage of 80 having a standard deviation 12, how many examinees would you expect to find above a score of 100?
Friday, February 5, 2016 by noel

Statistics
Sickle cell anemia is a genetic blood disorder where red blood cells lose their flexibility and assume an abnormal, rigid, "sickle" shape, which results in a risk of various complications. If both parents are carriers of the disease, then a child has a 25% ...
Friday, February 5, 2016 by Neveah

Statistics
Achusband and wife with brown eyes who have 0.75 probability of having children with brown eyes, 0.125 probability of having children with blue eyes, and 0.125 probability of having children with green eyes. (a) What is the probability that their first child will have ...
Friday, February 5, 2016 by Neveah

Statistics
A population =100 and sd=25. A sample (n=150) has X=102. Using 2 tails of the sampling distribution and the .05 criterion. What is the critical value? Is the sample in the region of rejection? What does this indicate about the likelihood of this sample occurring in this ...
Thursday, February 4, 2016 by Pam

Basic Statistics
home / study / questions and answers / math / statistics and probability / the manager of a vacation resort has claimed that, ... Question The manager of a vacation resort has claimed that, on average, a guest spends at least $1600 at the resort during a one week stay, ...
Thursday, February 4, 2016 by Jameson

Statistics
Suppose that in the city in which the survey is conducted, 50% of adults are married, 15% are single, 25% are divorced, and 10% are widowed. a. Assign probabilities to each simple event in the sample space. b. Which approach did you use in part (a)? Find the probabilities of ...
Thursday, February 4, 2016 by XYZ

Statistics
If a teacher is grading on a curve, the median is 78 and the standard deviation is 9.6, how do i find out the ranges for grades? ex, an A is the top 15% of the curve. I know it has to do with the z score and that is the # of standard deviations the score is from the median, ...
Wednesday, February 3, 2016 by Julie

Statistics
A survey asks adults to report their marital status. The sample space is S = {single, married, divorced, widowed} . Use set notation to represent the event the adult is not married. This is what I think is the answer Married = {single, divorced, widowed}
Wednesday, February 3, 2016 by XYZ

Statistics
Arachnophobia. A 2005 Gallup Poll found that 7% of teenagers (ages 13 to 17) suffer from arachnophobia and are extremely afraid of spiders. At a summer camp there are 10 teenagers sleeping in each tent. Assume that these 10 teenagers are independent of each other.52 (a) ...
Wednesday, February 3, 2016 by Anonymous

Biostatitics
Based on data collected by the National Center for Health Statistics and made available to the public in the Sample Adult database, an estimate of the percentage of adults who indicated to have at some point of their life been tested for HIV is 32 percent of U.S. adults in the...
Monday, February 1, 2016 by ayo

Statistics
Suppose that IQ scores have a bell-shaped distribution with a mean of 99 and a standard deviation of 12. Using the empirical rule, what percentage of IQ scores are less than 87? Please do not round your answer. 87-99 = -12/12 = -1 I get stuck here. I know 1 standard deviation ...
Monday, February 1, 2016 by Comet

statistics
You measure 64 children , obtaining a X of 57.28 . The mean is 56 and sd is 8 Slug says that bc this X is so close to the mean of 56 , this sample could hardly be considered gifted. A. Perform the appropriate statistical procedure to determine whether he is correct B. In what ...
Sunday, January 31, 2016 by pam

statistics, probability
Consider two events A and B in the same sample space such that P(A)=0.4 and P(B)=0.3. Then A and B are mutually exclusive.
Sunday, January 31, 2016 by Vasya

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Homework Help: Math