Saturday
April 19, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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Statistics
Use confidence interval formulas for proportions. CI95 = p + or - (1.96)(√pq/n) ...where √ = square root, p = x/n, q = 1 - p, and n = sample size. Hint: x = 150, n = 240 Convert all fractions to decimals to work the formulas. I hope this will help get you started.
Tuesday, April 8, 2014 at 5:15pm

Statistics
Use confidence interval formulas for proportions. CI95 = p + or - (1.96)(√pq/n) ...where √ = square root, p = x/n, q = 1 - p, and n = sample size. CI90 = p + or - (1.645)(√pq/n) Hint: x = 396, n = 621 Convert all fractions to decimals to work the formulas. I ...
Tuesday, April 8, 2014 at 5:08pm

Statistics PLEASE HELP ME!
You might try this formula: Pr[T ≤ t] = 1 - e^-ht h = reciprocal of the mean t = time Therefore, the reciprocal of 25 is 1/25 or .04 Substituting into the formula: Pr[T ≤ 20] = 1 - e^-.04(20) = 1 - e^-.8 = 1 - .4493 = .5507 Check these calculations.
Tuesday, April 8, 2014 at 5:01pm

statistics
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. a. .39^2 = ? b. .39 * (39-1)/(100-1) = ?
Tuesday, April 8, 2014 at 3:26pm

statistics
a. with replacement? b. without replacement?
Monday, April 7, 2014 at 11:51pm

statistics
if 2 out of 100 second graders are randomly selected, find the probability that they are both boys and like spring. boys/spring 39
Monday, April 7, 2014 at 11:48pm

Statistics PLEASE HELP ME!
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Monday, April 7, 2014 at 10:36pm

Economic/Statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Monday, April 7, 2014 at 9:27pm

Statistics
In a survey of 621 males ages 18-64 , 396 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the proportion. Interpret the results and compare the widths of the confidence intervals. Please show step by step. Thank you!
Monday, April 7, 2014 at 9:09pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Monday, April 7, 2014 at 7:52pm

Statistics
In a recent study, 100 males used a new weight-loss supplement, and all but 20 of them experienced weight loss after two weeks. In the same study, 20 females used the same supplement, and all but 4 of them experienced weight loss after two weeks. The new weight loss supplement...
Monday, April 7, 2014 at 7:29pm

Statistics
Professor York randomly surveyed 240 students at Oxnard University, and found that 150 of the students surveyed watch more than 10 hours of television weekly. Develop a 95% confidence interval to estimate the true proportion of students who watch more than 10 hours of ...
Monday, April 7, 2014 at 6:54pm

statistics
P(z <-1.0) = 0.1587 P(z <-1.5) = 0.0668 P(z <-2.5) = 0.0062 P(-3 < z < 0) = 0.500-0.0013
Monday, April 7, 2014 at 5:48pm

statistics
c. z = (100-120)/(200sqrt(120*.4) z = (110-120)/200/sqrt(120*.4)) d. z = (130-120)/200/sqrt((120*.4)) Use Z table
Monday, April 7, 2014 at 5:37pm

statistics
Assume a binomial probability distribution has p = .60 and n = 200. c. What is the probability of 100 to 110 successes (to 4 decimals)? d. What is the probability of 130 or more successes (to 4 decimals)?
Monday, April 7, 2014 at 5:14pm

statistics
Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). P(z -1.0) P(z -1.0) P(z -1.5) P(z -2.5) P(-3 < z 0)
Monday, April 7, 2014 at 5:13pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Monday, April 7, 2014 at 5:13pm

Statistics
I think you are referring to "dummy coding" but you may want to check this.
Monday, April 7, 2014 at 5:04pm

statistics
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
Monday, April 7, 2014 at 11:52am

Statistics
A
Monday, April 7, 2014 at 10:11am

Statistics / Math
Calculate the standard deviation for: 10, 20, 30 to the nearest tenth presuming a sample
Monday, April 7, 2014 at 12:41am

statistics
30
Sunday, April 6, 2014 at 11:08pm

statistics
21
Sunday, April 6, 2014 at 11:07pm

statistics
28
Sunday, April 6, 2014 at 11:06pm

statistics
47
Sunday, April 6, 2014 at 11:02pm

statistics
by the way that calculator uses x - mean for z instead of (x-mean)/sigma
Sunday, April 6, 2014 at 10:04pm

statistics
Here is an online normal distribution calculator: http://davidmlane.com/hyperstat/z_table.​html
Sunday, April 6, 2014 at 9:49pm

statistics
well, you have enough data points to use normal distribution rather than computing with binomials forever and a day. Otherwise use a program or spreadsheet to compute all the binomial coefs and powers and products mean = n p = 200 * .6 = 120 sigma^2 = 120 (.4) = 48 so sigma = ...
Sunday, April 6, 2014 at 9:20pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Sunday, April 6, 2014 at 9:04pm

statistics
Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). P(z -1.0) P(z -1.0) P(z -1.5) P(z -2.5) P(-3 < z 0)
Sunday, April 6, 2014 at 9:02pm

statistics
Assume a binomial probability distribution has p = .60 and n = 200. c. What is the probability of 100 to 110 successes (to 4 decimals)? d. What is the probability of 130 or more successes (to 4 decimals)?
Sunday, April 6, 2014 at 9:01pm

statistics
11.68 / 141 = 0.08284 = 8.28%
Sunday, April 6, 2014 at 8:44pm

statistics
11.68 is what percent of 141
Sunday, April 6, 2014 at 5:47pm

Statistics
1. For the following research question, specify the parameter and give the null and alternative hypotheses. "Is there a difference in the proportions of male and female college students who smoke cigarettes? 2. For the following research question, specify the parameter ...
Sunday, April 6, 2014 at 4:04pm

Statistics
A procedure in regression analysis where Predictor or Independent Variables are coded as 1 or 0 (representing categories) and can be used to produce ANOVA Tables under the General Linear Model is known as…?
Sunday, April 6, 2014 at 12:42pm

Statistics
fdgdfgf
Sunday, April 6, 2014 at 10:42am

Statistics
z = (32-30)/4sqrt(16)) z = 2. Z table
Sunday, April 6, 2014 at 1:23am

statistics
a. mean = np = 200(.6) =120 Standard deviation = sqrt((.6*.4*200))= sqrt(48)
Sunday, April 6, 2014 at 1:18am

statistics
Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). P(z -1.0) P(z -1.0) P(z -1.5) P(z -2.5) P(-3 < z 0)
Saturday, April 5, 2014 at 11:42pm

statistics
Assume a binomial probability distribution has p = .60 and n = 200. a)What are the mean and standard deviation (to 2 decimals)? b)Why can the normal probability distribution be used to approximate this binomial distribution? c)What is the probability of 100 to 110 successes (...
Saturday, April 5, 2014 at 11:42pm

statistics
Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution with a ...
Saturday, April 5, 2014 at 11:40pm

Statistics
The height of a certain species of a tree are normally distributed with a mean of 30ft and stand dev of 4ft. If a random sample of 16 of these trees is taken, what is the probability that the sample mean is less than 32fy?
Saturday, April 5, 2014 at 8:03pm

statistics
Is the distribution normal, positively skewed or negatively skewed? The average (whichever) rounds to 2. The mean is most influenced by deviant scores, so it would be the lowest in a negatively skewed distribution, having relatively more scores above it. The mode would be ...
Saturday, April 5, 2014 at 5:40pm

Statistics
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z scores.
Saturday, April 5, 2014 at 5:26pm

Statistics
I also agree
Saturday, April 5, 2014 at 5:14pm

Business statistics
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. .67^3 = ?
Saturday, April 5, 2014 at 5:13pm

Statistics
Typo P(all) = 3C3 (.67)^3(.33)^0 =0. 300763 Answer is 0.301
Saturday, April 5, 2014 at 3:35pm

statistics
76.8
Saturday, April 5, 2014 at 3:24pm

Statistics
P(all) = 3C3 (.67)^3(.33)^0 = 300763 Answer is 0.301
Saturday, April 5, 2014 at 2:05pm

Statistics
Yes it is
Saturday, April 5, 2014 at 1:57pm

Statistics
P(all) = 3C3 (.67)^3 (.33)^0 =
Saturday, April 5, 2014 at 1:56pm

statistics
You are responsible for planning the parking needed for a new 256-unit apartment complex, and you are told to base the needs on the statistic “average number of vehicles per household is 1.9.” Which average (mean, median, mode) would be best if: • You wanted to ...
Saturday, April 5, 2014 at 1:13pm

Statistics
You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability= ? My answer is 0.301 3 decimal ...
Saturday, April 5, 2014 at 11:35am

Statistics
a procedure in REGRESSION NALYSIS WHERE PREDICTOR OR INDEPENDENT VARIABLES ARE CODED AS 1 OR 0 (REPRESENTING CATEGORIES) AND CAN BE USED TO PRODUCE ANOVA TABLES UNDER THE GENERAL LINEAR MODEL IS KNOWN AS?
Saturday, April 5, 2014 at 8:58am

statistics
I usually get help from free statistics homework help
Saturday, April 5, 2014 at 8:19am

Statistics
You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability =??
Friday, April 4, 2014 at 11:28pm

Statistics
4.0
Friday, April 4, 2014 at 9:54pm

statistics
Dylan wants to determine a 90 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must he have to get a margin of error less than 0.03? [To find n, use the value p* = 1/2 for the ...
Friday, April 4, 2014 at 9:10pm

Business statistics
You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability=
Friday, April 4, 2014 at 8:19pm

Statistics
A survey of top executives revealed that 37% of them regularly read Time magazine, 21% read Newsweek and 38% read U.S. News & World Report. Eleven percent read both Time and U.S. News & World Report. What is the probability that a particular top executive reads either Time or ...
Friday, April 4, 2014 at 7:46pm

Statistics
You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability=
Friday, April 4, 2014 at 6:52pm

Statistics
You're welcome.
Friday, April 4, 2014 at 6:40pm

Statistics
A survey of top executives revealed that 37% of them regularly read Time magazine, 21% read Newsweek and 38% read U.S. News & World Report. Eleven percent read both Time and U.S. News & World Report. What is the probability that a particular top executive reads either Time or ...
Friday, April 4, 2014 at 6:39pm

Statistics
Thank you
Friday, April 4, 2014 at 6:38pm

Statistics
25/894 or 0.028
Friday, April 4, 2014 at 6:28pm

Statistics
The National Center for Health Statistics reported that of every 894 deaths in recent years, 25 resulted from an automobile accident, 185 from cancer and 309 from heart disease. What is the probability that a particular death is due to an automobile accident? 25/309 or 0.081 ...
Friday, April 4, 2014 at 6:20pm

Statistics
The heights of 18 year old men are approximately normally distributed, with a mean of 67 inches and a standard deviation of 5 inches. What is the probability an 18 year old man selected at random is between 66 and 68 inches? Use FOUR decimal places.
Friday, April 4, 2014 at 1:43pm

Algebra 2
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though. However, I will start you out with the first problem. I assume that you want the proportion ...
Friday, April 4, 2014 at 12:19pm

Statistics - Please help
Lmao, I said F U C K You
Thursday, April 3, 2014 at 10:06pm

Statistics - Please help
!@#$%^& YOU
Thursday, April 3, 2014 at 10:06pm

statistics
You can try a proportional one-sample z-test for this problem. Check a table for the critical value to compare to the test statistic. If the test statistic exceeds the critical value, then reject the null and accept the alternative hypothesis.
Thursday, April 3, 2014 at 5:10pm

Statistics - Please help
stop cheating
Thursday, April 3, 2014 at 4:24pm

Statistics - Please help
An experiment was conducted to determine the abrasion resistance of a new type of automobile paint. Twelve different strips of metal were painted with the new paint. The abrasion resistance of each piece was then tested on a machine. In the sample, the abrasion resistance ...
Thursday, April 3, 2014 at 3:55pm

statistics
Positive, since both are increasing together.
Thursday, April 3, 2014 at 1:37pm

maths
I searched Google under the key words "statistics alpha beta error" to get these possible sources: https://www.google.com/search?client=saf​ari&rls=en&q=statistics+alpha+beta+error​&ie=UTF-8&oe=UTF-8 In the future, you can find the information you desire ...
Thursday, April 3, 2014 at 1:19pm

statistics
à manufacturer of computers designed to aid social scientists in analyzing research data clams that his computers are opérational for at least 80 percent of the time. during the course of the year one computer was operational for 270 days. test, 1 percent ...
Thursday, April 3, 2014 at 6:47am

Statistics
Wft this question is older then my booty
Thursday, April 3, 2014 at 1:32am

statistics
Since, in general, the longer a car is owned the more miles it travels one can say there is ______ between age of a car and milege. a positive association, no association, a negative association, a scattered association
Wednesday, April 2, 2014 at 8:09pm

statistics/probability
lijlkjllkjlkj
Wednesday, April 2, 2014 at 5:19pm

statistics
a. E= 1.96 * sqrt((.56*.44/100)) = .09729 b. E= 1.96 * sqrt((.56*.44/400)) = .0486
Wednesday, April 2, 2014 at 1:51pm

statistics
For each combination of sample size and sample proportion, find the margin of error for the 95% confidence level. (a) n=100 and p-hat=.56 (b) n=400 and p-hat=.56
Wednesday, April 2, 2014 at 11:27am

statistics
An experiment was conducted to determine the abrasion resistance of a new type of automobile paint. Twelve different strips of metal were painted with the new paint. The abrasion resistance of each piece was then tested on a machine. In the sample, the abrasion resistance ...
Wednesday, April 2, 2014 at 11:19am

Statistics
0.2 = (230-226.2)/SD 0.2SD = 3.8 SD = 19
Wednesday, April 2, 2014 at 1:16am

Statistics
9 points) In a normally distributed data set, find the value of the standard deviation if the following information is given. a. The mean is 226.2. x = 230. z = 0.2. Standard deviation
Tuesday, April 1, 2014 at 10:18pm

Business Statistics
*
Tuesday, April 1, 2014 at 9:19pm

Statistics
5
Tuesday, April 1, 2014 at 4:01pm

statistics
105.88
Tuesday, April 1, 2014 at 12:48pm

statistics
Survey on concern for criminal in a survey 3 of 4 students said the court show too much concern for criminals find the probability that 3 out of 7 randomly selected students will agree with this statement
Tuesday, April 1, 2014 at 9:24am

statistics
plug in your data here .... http://davidmlane.com/hyperstat/z_table.​html to get .4013
Monday, March 31, 2014 at 7:52pm

statistics
The volumes of soda in quart soda bottles are normally distributed with a mean of 32.3 oz and a standard deviation of 1.2 oz. What is the probability that the volume of soda in a randomly selected bottle will be less than 32 oz?
Monday, March 31, 2014 at 7:13pm

Statistics
You will have to collect the raw data yourself. Find the mean first = sum of scores/number of scores Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Standard deviation = ...
Monday, March 31, 2014 at 1:38pm

statistics
first one 12/45 second on 11/44 12/45 * 11/44
Monday, March 31, 2014 at 8:38am

statistics
In a statistics class of 45 students, 12 have a strong intrest in statistics. If two students are selected at random from this class, what is the propability that both of them have a strong interest in statisitcs?
Monday, March 31, 2014 at 4:31am

Statistics
I need assistance in calculating the mean and standard deviation from data collected using 2 surveys, strongly agree, agree, neutral, disagree, strongly disagree. Can someone help please? Need the raw data also.
Sunday, March 30, 2014 at 8:10pm

statistics
Binomial distribution find probability of zero boys P(0) answer is 1 - P(0) n = 6 p = .5 and 1-p = .5 P(0) = C(6,0) (.5)^0 (.5^6) coef for any n,0 = 1 so P(0) = .5^6 = .0156 1-P(0) = .984
Sunday, March 30, 2014 at 5:03pm

statistics
If boys and girls are equally likely to be born, what is the probability that in a randomly selected family of 6 children, there will be at least one boy? (Find the answer using a formula. Round your answer to three decimal places.)
Sunday, March 30, 2014 at 4:25pm

Statistics
44
Sunday, March 30, 2014 at 3:09pm

Statistics
. A 2003 Harris Poll of 993 randomly selected American adults found that 69% believed in capital punishment (death penalty). A sample size of 1010 American adults in 2000 found that 64% believed in capital punishment. Write the hypotheses for a significance test to determine ...
Saturday, March 29, 2014 at 1:06pm

Statistics
Sorry to ask another question but I keep struggling with this class. If all else remains the same, which of these will make a confidence interval for a proportion narrower? I. Increase the confidence level. II. Increase the sample size. III. Increase the margin of error. A. I ...
Saturday, March 29, 2014 at 12:59pm

Statistics
Which of these statements is always true for a researcher who is using standard statistical methods in a test of significance? A. A researcher who rejects a true null hypothesis has committed a Type II error. B. A researcher who rejects the null hypothesis has computed a test ...
Saturday, March 29, 2014 at 12:33pm

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