Number of results: 39
Sunday, March 7, 2010 at 2:40pm by PsyDAG
How would you like us to help you with this assignment?
Monday, April 18, 2011 at 12:50pm by Ms. Sue
16+48+112+110+156= now divide that by sum of frequencies...
Thursday, March 14, 2013 at 12:52pm by bobpursley
Find the mean for the following data variable=4,6,8,10,12 freqency=4,8,14,11,13
Thursday, March 14, 2013 at 12:52pm by anoynomous
n=p(1-p(Zc/E)sqrd =(.5)(.5)(1.44/.1)sqrd =51.84 =52
Sunday, December 19, 2010 at 6:52pm by Brenda
You want mean ± 2.33 SEm for 98% confidence interval. SEm = SD/√n I'll leave the rest to you.
Saturday, November 5, 2011 at 10:42pm by PsyDAG
For each of the following confidence intervals, indicate how much of the distribution would be placed in the cutoff region for a two-tailed test from 80%, 85% and 99%
Monday, April 8, 2013 at 1:58pm by jerry
A population has mean 53 and standard deviation 12. Calculate the mean of x bar for a random sample of size 10.
Sunday, November 11, 2012 at 8:20pm by Anonymous
20 1 23 1 24 1 27 1 28 1 30 3 31 3 32 3 33 2 34 4 35 2 36 6 37 7 38 1 etc normal around 36 mean
Monday, April 18, 2011 at 12:50pm by Damon
stastics- correlation and regression
When x increases by 1, y increases by 1/4. 1 is correct, but if both variables increase, is that a positive or negative correlation?
Tuesday, October 19, 2010 at 1:31am by PsyDAG
The first clzxx in a relative frequency table is 50-59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?
Saturday, February 13, 2010 at 1:48pm by Liz
Math? Stastics? What?
Please type your subject in the School Subject box. Any other words, including obscure abbreviations, are likely to delay responses from a teacher who knows that subject well.
Sunday, September 12, 2010 at 4:12am by Writeacher
If the median home price in your area has decreased in your area in the last 2 years, how does this differ from the mean price in your area? Please explain why and include examples.
Tuesday, August 24, 2010 at 8:55pm by sue
If 1.5% of the bolts made by an automotive factory are defective, what is the probability that in a shipment of 200 bolts, there are 6 defective bolts? Place your answer, rounded to four decimal places, in the blank.
Sunday, July 8, 2012 at 4:28pm by jen
average for all football teams was an 86 with variance of 16. the buckeyes program over the last 16 year was a 93. is there sufficient proof at the .05 level of significance to say buckeyes were higher than everyone else.
Wednesday, April 3, 2013 at 1:40pm by K
You will need to find P(3), P(4), and P(5). Add those values for your probability. You can use a binomial probability table, or calculate by hand using the following formula: P(x) = (nCx)(p^x)[q^(n-x)] x = 3,4,5 n = 5 p = 130/680 = 0.19 q = 1 - p = 1 - 0.19 = 0.81 I'll let...
Wednesday, April 3, 2013 at 10:21am by MathGuru
Bank of Connecticut estimated that balance on credit cards have follows Normal Distribution mean $845 with standard deviation $270. Calculate probability that balance on a single credit card is greater than $750
Sunday, March 7, 2010 at 2:41pm by Mary
solving problem the chicago public school system has about 680 schools about 130 of the schools will be closed. if the five schools are chosen at random find the probability that at least three of them willl be closed
Wednesday, April 3, 2013 at 10:21am by lilly
An employer claims that full time employees have a mean income of $35,000. A sample of 200 employees were considered. Their mean salaray was $34,000. POP sd of $4,000. Does her claim seem reasonable at at 0.05 significance level?
Tuesday, December 7, 2010 at 9:46am by Sammy Jo
A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 98% confident that the true mean is within 2 ounces of the sample mean? The standard deviation of the birth weights is known to be 5 ...
Saturday, November 5, 2011 at 10:42pm by WEB
johns runs a computer software store.he counted 128 people who walkrd by his store in a day , 60 of whom came into the store, of the 60 only 21 brought something in the store.estimate the prob that that a person who walks by the storeenter the store .round your answer to the ...
Tuesday, December 7, 2010 at 8:09pm by gaio
It took me a few minutes to realize this is a trick question. It is impossible to have exactly one CD in the wrong envelope. If a CD is in the wrong envelope, then there must be at least one other CD in a wrong envelope. So, the probability is zero.
Saturday, July 25, 2009 at 6:22pm by economyst
Imagine that you have 10 CDs and 10 envelopes on a table before you; each CD and each envelope are labelled with a number such as 7 or 10. If you randomly put the CDs into the envelopes provided, what is the probability of matching only one CD into the wrong envelope?
Saturday, July 25, 2009 at 6:22pm by robyn
I'm having a hard time with question, can someone help me? A random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for p, how many medical files should you include in a random sample in ...
Sunday, December 19, 2010 at 6:52pm by Kim
Approimately 10.3% of American high school students drop out of school before gradution. Choose 10 students entering high school at random. Find the probability that (Assume binomial distribution): a. Exactly two drop out b. At least 7 graduate c. All ten stay in school and ...
Thursday, April 26, 2012 at 6:11pm by keshia
Look again at the distribution of ages in Problem before. : 2.0 points Each part is worth 1 point. a) About what percent of the people were in their thirties? Round your answer to one decimal place. unanswered b) A common (though not universal) definition of "senior ...
Monday, February 25, 2013 at 3:27am by A
prob (defective) = .015 prob(not defective) = .985 prob (6 of 200 defective) = C(200,6) (.015)^6 (.985)^194 = .0500
Sunday, July 8, 2012 at 4:28pm by Reiny
stastics- correlation and regression
for the table that follows: answer the following questions: x y 1 -1/4 2 -1/2 3 -3/4 4 ? * would the correlation between x and y in the table show above be positive or negative? i think that it would be negative, i am not sure that is correct? * find the value of y in the ...
Tuesday, October 19, 2010 at 1:31am by mary-please help figure out this problem.
Practice Problem #16 pg. 307: A researcher theorized that people can hear better when they have just eaten a large meal. Six individuals were randomly assigned to eat either a large meal or a small meal. After eating the meal, their hearing was tested. The hearing ability ...
Thursday, January 13, 2011 at 9:25am by Dianne
University of Phoenix
Are you a student at the university? Have you checked the library? You can ask a librarian. Also you can go online and get financial statistics from large companies. You could also check scholarly articles on Dell finances. Finance magazines can help with that. You can usually...
Friday, August 5, 2011 at 5:13am by Aria
To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine found in all commercial brands of cigarettes. A new cigarette has recently been marketed. The FDA tests on this cigarette yielded mean nicotine content ...
Sunday, November 28, 2010 at 11:30am by Roger
Use a one-sample z-test. z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) Note: Standard deviation is the square root of the variance. Check a z-table at .05 level of significance for a one-tailed test. If the z-test ...
Wednesday, April 3, 2013 at 1:40pm by MathGuru
When we convert x-value to z- score and use Standard Normal distribution, which of the following statements is true? a) The mean of z-score is zero and standard deviation of the z-scores is the same as the standard deviation of original data b) The mean and standard deviation ...
Sunday, March 7, 2010 at 2:40pm by Mary
Following are the speeds of 40 cars clocked by radar on a particular road in a 35-mph zone on a particular afternoon: 30, 36, 42, 36, 30, 52, 36, 34, 36, 33, 30, 32, 35, 32, 37, 34, 36, 31, 35, 20, 24, 46, 23, 31, 32, 45, 34, 37, 28, 40, 34, 38, 40, 52, 31, 33, 15, 27, 36, 40 ...
Monday, April 18, 2011 at 12:50pm by tonya
Suppose cars arrive at Burger King's drive-through at the rate of 20 cars every hour between 12:00 noon and 1:00 pm. A random sample of 40 one-hour periods between 12:00 noon and 1:00 pm is selected and has 22.1 as the sample mean number of cars arriving. (a) Why is the ...
Saturday, October 22, 2011 at 11:03am by Emma
A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 first-time users of a new statistics program revealed the mean time to learn it was 39 hours with the standard deviation of 8 hours. At the 0...
Saturday, June 5, 2010 at 8:02pm by slayer
What kind of math classes must you take to become a Biologist? What kind of math classes must you take to become a Geneticist? I'm not a biologist, but I do know a little about math. I know there's a specialty in math called bio-stastics. I think that course requires ...
Sunday, September 10, 2006 at 2:36pm by Ande
A survey of drivers in the United States found that 15% never use a cell phone while driving. Suppose that drivers arrive at random at an auto inspection station. a. If the inspector checks 10 drivers, what is the probability that at least one driver never uses a cell phone ...
Tuesday, May 3, 2011 at 12:15am by level crawford
a car dealer estimates that they sell two cars on average per week. they only have space in their showroom for 4 cars. if stock replacement cannot take place within a week, what is the probability assuming that weekly car sales follow a poisson distribution that, the dealer ...
Friday, April 27, 2007 at 3:51am by mary
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