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April 19, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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Statistics
I already found part A just need help with B! The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct...
Thursday, November 7, 2013 at 11:06pm

statistics
a. z = (65-64.6)/(2.8/sqrt(1)) z = 0.14 b. z = (65-64.6)/(2.8/sqrt(49)) z = 1
Thursday, November 7, 2013 at 10:42pm

statistics
great webpage for your problem, just plug in the values that you have http://davidmlane.com/hyperstat/z_table.​html
Thursday, November 7, 2013 at 9:43pm

statistics
Assume that women's heights are normally distributed with a mean given by u=64.6 in and a standard deviation given by 0=2.8in. a) If 1 woman is randomly selected, find the probability that her height is less than 65in. b) If 49 women are randomly selected, find the ...
Thursday, November 7, 2013 at 9:03pm

Statistics
In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1 to 10. The date follow: Number of Cups of Coffee 3,2,4,6,5,1,7,3 Stress Level 5,3,3,9,4,2,10,5 Calculate a Pearsons r to determine the...
Thursday, November 7, 2013 at 8:47pm

Statistics
When groups of data are separated, an association can get stronger because of a lurking variable. That lurking variable is usually the number of observations in the different groups of data.
Thursday, November 7, 2013 at 8:44pm

statistics
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. See your previous post.
Thursday, November 7, 2013 at 12:19pm

statistics
Assume that adults have IQ score that are normally distributed with a mean of 105 and a standard deviation 20. Find P, which is the IQ score separating the bottom 10% from the top 90%. Round to the nearest hundredth as needed.
Thursday, November 7, 2013 at 11:13am

Statistics
You draw nine cards from a standard deck of cards. What is the probability that a. four or more will be red, b. exactly two or three will be red, c. two or fewer will be red, and d. exactly five will be red?.
Thursday, November 7, 2013 at 8:30am

math
a nice calculator can be found at http://easycalculation.com/statistics/st​andard-deviation.php It will verify the answers which you have calculated on your own >wink wink<
Thursday, November 7, 2013 at 4:09am

Statistics
Using a 0.05 level of significance, test the hypothesis that the probability of the NCAA Division I basketball champion being from the Pac 10 is 20%. Repeat the test for the hypothesis that the probability the champion is UCLA is 20%. What do these results say about testing ...
Thursday, November 7, 2013 at 2:49am

Statistics
2E + 188 = 206 2E = 206-188 2E = 18 E = 9 Answer B
Wednesday, November 6, 2013 at 9:13pm

Statistics
When consumers apply for credit, their credit is rated using the FICO score. A bank manager used a random sample of the credit scores of 18 customers and determined the following 95% confidence interval: (613.6, 708.0) If the sample used 45 customers rather than 18 customers, ...
Wednesday, November 6, 2013 at 7:51pm

Statistics
A scientist in Smallville tested the cholesterol of a random sample of 35 town residents. He constructed the following confidence interval: t-interval for μ: with 99.00% Confidence: 188 < μ(Cholesterol) < 206 What is the margin of error? A) 18 B) 9 C) 1.09 D) ...
Wednesday, November 6, 2013 at 7:49pm

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 score. Multiply by 100 to get the percentage.
Wednesday, November 6, 2013 at 1:20pm

Statistics
In a large collection of real SMS text messages from particular cellphone users, 13.40% of messages are identified as spam. Of all spam messages 17.0% contain both the word "free" and the word "text" ("txt") For example, "Congrats!! You have ...
Tuesday, November 5, 2013 at 5:54pm

Statistics
I'm not sure
Tuesday, November 5, 2013 at 5:07pm

statistics
The weight of a can made from a machine is normally distributed with a mean of 25 grams and a standard deviation of 0.4 grams. What percentage of the cans from this machine would not meet the minimum required weight of 24 grams? Round to the nearest hundredth of a percent
Tuesday, November 5, 2013 at 4:49pm

Statistics
1. 29 2. What do you think?
Tuesday, November 5, 2013 at 1:52pm

Statistics
1,3,5,3,2,29,3,4,2,1,2 Mean 5 Range 28 Variance 64.8 Standard Deviation 8.0 1.What value is affecting the mean and SD of this distribution? 2.Does the mean adequately represent this disribution? If bot, what would be a better measure of central tendency for this data set?
Tuesday, November 5, 2013 at 11:13am

Statistics
True 1. CORRELATION Correlation means that two variables (sets of data) have some type of association with each other, such that as one variable increases, the other also increases (a positive correlation), or decreases (a negative correlation).
Tuesday, November 5, 2013 at 11:03am

Statistics
when two variables are correlated it means that one is the cause of the other. true or false?
Tuesday, November 5, 2013 at 10:41am

statistics
P(20 < x < 23) = P(X = 20 ) + P (X = 21) + P(X = 22) + P(X = 23) P(20 < x < 23) = (30C20)(.23)^20(.77)^10 + (30C21)(.23)^21(.77)^9 + (30C22)(.23)^22(.77)^8 + (30C23)(.23)^23(.77)^7 = ?
Tuesday, November 5, 2013 at 1:43am

statistics
P(X ≥ 13) = P (X= 13) + P (X = 14) + P (X = 15) P(X ≥ 13) =(15C13)(.9)^13(.1)^2+ (15C14)(.9)^14(.1)^1+ (15C15)(.9)^15(.1)^0 = .8159
Monday, November 4, 2013 at 9:24pm

statistics
In a region, 90% of the population have brown eyes. If 15 people are randomly selected, find the probability that at least 13 of them have brown eyes. Is it unusual to randomly select 15 people and find that at least 13 of them have brown eyes? Why or why not?
Monday, November 4, 2013 at 8:08pm

Statistics
P value (e.g., P ≤ .05) is the probability that the null hypothesis is true, even though it may be rejected at this level.
Monday, November 4, 2013 at 6:22pm

statistics
z = (score -mean)/sd a. z = (74-69)/2.8 z = 5/2.8 = 1.79 is .0367 The percentage of men that are taller than in is 3.67% b. z = (score -mean)/sd z = ((70-63.6)/2.5 z = 6.4/2.5 = 2.56 is .0052 The percentage of women that are taller than in is .52%.
Monday, November 4, 2013 at 5:34pm

Statistics
The p-value is the probability of the observed statistic given the null hypothesis is true. A) True B) False False?
Monday, November 4, 2013 at 4:59pm

Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey (randomly generated phone numbers were used) of ...
Monday, November 4, 2013 at 4:57pm

statistics-PLEASE HELP quick
I have less than 24 hours to find the binomial probability of P(20<x<23)= and P(x>23)= if n=30 p=.23 u=6.9 q=.77 and the standard deviation is 2.3 can someone please show me how to get the outcome they want?
Monday, November 4, 2013 at 3:44pm

Statistics
answer A
Monday, November 4, 2013 at 3:28pm

Statistics
It is normal model z-score
Monday, November 4, 2013 at 3:08pm

Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
Monday, November 4, 2013 at 2:44pm

Statistics Help Please
A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a letter (costing about $0.45) asking the customer to pay. That worked 30% of the time. The bank wants to test a new method that involves ...
Monday, November 4, 2013 at 2:42pm

Statistics
The business college computing center wants to determine the proportion of business students who have laptop computers. If the proportion exceeds 35%, then the lab will scale back a proposed enlargement of its facilities. Suppose 200 business students were randomly sampled and...
Monday, November 4, 2013 at 2:35pm

statistics
Tall clubs international is a social organization for tall people. It has a height requirement that men must be at least 74 in. and women must be at least 70 in. tall. If men's heights have a normal mean of 69.0 in and a deviation of 2.8 and women's normal heights have...
Monday, November 4, 2013 at 1:55pm

statistics
If P=.23 and n=30 what is the outcome of P(20<x<23)= P(x>23)= please show the whole solution so I can learn how and why the outcome was achieved. Thanks so much.
Monday, November 4, 2013 at 1:42pm

statistics
binompdf(3, .60, 1)
Monday, November 4, 2013 at 12:31am

Statistics Problems
A market sells potatoes whose weights are normally distributed with mean 65 grams and standard deviation 15 grams. (i) Find the probability that a randomly chosen potato weighs between 40 grams and 80 grams. The market sells potatoes weighing more than 80 grams separately ...
Sunday, November 3, 2013 at 10:22pm

Healthcare Statistics
You've already stated that the required payback period is 3 years. 3,500x > 28,000 Solve for x to find how long the company would need to keep this equipment.
Sunday, November 3, 2013 at 9:06pm

Statistics
No Left-tailed
Sunday, November 3, 2013 at 8:56pm

Healthcare Statistics
In deciding whether to purchase or lease a new dictation system, the HIM supervisor calculates the payback period. The hospital's required payback period is three years. If the equipment costs $ 28,000 and generates $3,500 per year in savings, what would be the payback ...
Sunday, November 3, 2013 at 8:56pm

statistics
binomial = (n, p, x) Binompdf (11, .6, 1)
Sunday, November 3, 2013 at 7:54pm

Healthcare Statistics
100(14,000 / 62,000) = ______%
Sunday, November 3, 2013 at 7:08pm

Healthcare Statistics
the coding section in the HIM department shows its first-quarter budget analysis as having an expected cost of operation of $62,000. However, the actual cost of operation was $76,000. calculate the budget variance.
Sunday, November 3, 2013 at 7:01pm

Statistics
In deciding whether to purchase or lease a new dictation system, the Him supervisor calculates the payback period. The hospital's required payback period is three years. If the equipment costs $ 28,00 and generates $3,500 per year in savings, what would be the payback ...
Sunday, November 3, 2013 at 6:48pm

Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
Sunday, November 3, 2013 at 6:37pm

Statistics Problems
The bank sets up an experiment to test the effectiveness of the DVD. The mail it out to a random sample of delinquent customers and keep track of how many actually do contact the bank to arrange payments. The bank's statistician calculates a p-value (probability-value) of ...
Sunday, November 3, 2013 at 6:35pm

Statistics
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 5%. the type of alternative hypothesis is: left-tailed right-tailed or two-tailed Is this right-tailed?
Sunday, November 3, 2013 at 6:33pm

statistics
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use a binomial probabilities table to find the probability of x successes given the probability p of success in a given trial. n= 3 , x=1, p= 0.60
Sunday, November 3, 2013 at 5:56pm

Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
Sunday, November 3, 2013 at 4:16pm

Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
Sunday, November 3, 2013 at 4:13pm

Statistics
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
Sunday, November 3, 2013 at 12:45pm

Statistics
a. k =90 n = 20 90th percentile = k/100 *n 90/100* 20 =18 90th percentile = 69 b. percentile = R/(n +1) 8/(20+ 1) 8/21 = .38095 *100 =
Sunday, November 3, 2013 at 12:34pm

Statistics
your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,6​8,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, what is your percentile?
Sunday, November 3, 2013 at 11:46am

Statistics
Dear Lee, Please confirm these answers to this question. your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,6​8,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, ...
Sunday, November 3, 2013 at 11:25am

Statistics
a. 69 b. 40th percentile
Sunday, November 3, 2013 at 11:21am

Statistics
a. 69 b. 40th percentile
Sunday, November 3, 2013 at 11:20am

Statistics
your medical terminology instructor listed the following grades for the class out of a 75 point test:<br /> 33,34,43,45,45,54,55,59,60,62,64,66,67,6​8,67,68,68,69,70,70<br /> a.find the 90th percentile<br /> b. your score was 59, what is your ...
Sunday, November 3, 2013 at 11:17am

Statistics
Is the p-value 0.4995?
Saturday, November 2, 2013 at 7:25pm

Statistics
n = 1026 za/2 = 1.645 phat = .659 qhat = 1-phat qhat = 1-.659 = .341 Error = z/2* sqrt( phat *qhat/n) E = 1.645 * sqrt(.659 * .341/1026)) E = 0.0243 Phat -E <p< phat + E (.659-.0243, .659+ .0243) (.6347, .6833) or ( 63.5% , 68.3%) The 90% confidence interval is : (63.5...
Saturday, November 2, 2013 at 2:24pm

Probability and Statistics
Random Variables X and Y follow a joint distribution: f(x,y)=(6-x-y)/8 if 0<x<2, 2<y<4 and 0, else Find P(1<Y<3|X=1) I first got the marginal distribution for x and got (3-x)/4 (Integrated from 2 to 4)and then got the conditional dist and got (5-y)/4 and then...
Saturday, November 2, 2013 at 12:40pm

Statistics
The bank sets up an experiment to test the effectiveness of the DVD. The mail it out to a random sample of delinquent customers and keep track of how many actually do contact the bank to arrange payments. The bank's statistician calculates a p-value (probability-value) of ...
Saturday, November 2, 2013 at 10:37am

Statistics
A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a letter (costing about $0.45) asking the customer to pay. That worked 30% of the time. The bank wants to test a new method that involves ...
Saturday, November 2, 2013 at 10:36am

psy statistics
Why is a correlation the most appropriate statistic?
Saturday, November 2, 2013 at 9:29am

Statistics
Is the p-value to the below question 0.4995? Do you reject or fail to reject the null hypothesis? Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women ...
Saturday, November 2, 2013 at 9:10am

Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
Saturday, November 2, 2013 at 8:59am

statistics
P(0) = 0.000729 P(1) = 0.010206 P(2) = 0.059535 P(3) = 0.18522 P(4) = 0. 324135 P(5) = 0.302526 P(6) = 0. 117649
Friday, November 1, 2013 at 11:57pm

statistics
Assure that a procedure yields abinomial distribution with a trial repeated n times. Use abinomial probabilities table to find the probability if x sucesses given the probability of sucess of a given trial. n=6 x=0 p= 0.70
Friday, November 1, 2013 at 10:30pm

Probability and Statistics
Random Variables X and Y follow a joint distribution: f(x,y)=(6-x-y)/8 if 0<x<2, 2<y<4 and 0, else Find P(1<Y<3|X=1) I first got the marginal distribution for x and got (3-x)/4 (Integrated from 2 to 4)and then got the conditional dist and got (5-y)/4 and then...
Friday, November 1, 2013 at 6:53pm

Statistics
A
Friday, November 1, 2013 at 1:23pm

statistics
y hat = .255x + 23.695 y bar = 26.4 x bar = 10.6 SE² = [ Σ(y-yBar)^2 - [Σ(x-xBar)(y-yBar)]²/Σ(x-​xBar)² ] /(n-2)
Friday, November 1, 2013 at 11:16am

statistics
Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 1 3 1 6 3 6 1 4 4 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do this on paper. Your ...
Friday, November 1, 2013 at 3:46am

statistics
The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct to two decimal places.) x 7 6 9 11 11 5 14 8 ...
Friday, November 1, 2013 at 3:41am

statistics
40
Thursday, October 31, 2013 at 4:29pm

statistics
40
Thursday, October 31, 2013 at 4:29pm

Statistics Question
56
Thursday, October 31, 2013 at 2:40pm

Statistics
The coding department of a large physician clinic is interested in purchasing a software program that will edit claims before they are sent out to billing. The license fee for the software costs $34,000 per year. The software is expected to reduce the number of errors on ...
Thursday, October 31, 2013 at 2:12pm

statistics
A good interactive Z table site is http://davidmlane.com/hyperstat/z_table.​html You can play around there with various ideas, and compare the results with your Z table.
Thursday, October 31, 2013 at 1:58pm

statistics
if n=30 and p=.23 what is P(20,x,23)= and P(x.23)= I think I need to find the z scores in order to solve but how do I read the table or do I even need it. UGH! so confusing especially 20 years later.
Thursday, October 31, 2013 at 12:32pm

statistics
Where do I check it?
Thursday, October 31, 2013 at 7:39am

statistics
125.9, 230.3
Thursday, October 31, 2013 at 12:10am

statistics
what is P(20,x,23)= and P(x.23)= You have to check
Thursday, October 31, 2013 at 12:04am

statistics
if n=30 and p=.23 what is P(20,x,23)= and P(x.23)=
Wednesday, October 30, 2013 at 11:39pm

statistics
125.876,218.9?
Wednesday, October 30, 2013 at 11:15pm

statistics
they gave me n=30 and p=.23 to get the answers for P(20,x,23)= and P(x.23)= Im just having a hard time with all of this
Wednesday, October 30, 2013 at 11:11pm

statistics
[178.1-1.28(40.8), 178.1+ 1.28(40.8) ] =[ ] ?
Wednesday, October 30, 2013 at 10:25pm

statistics
you use that formula when you know what to do. nCr nPr
Wednesday, October 30, 2013 at 10:07pm

statistics
Are these using nCr? If not what formula do I use? P(20,x,23)= P(x.23)=
Wednesday, October 30, 2013 at 9:52pm

statistics
The serum cholesterol levels for men in in one age group are normally distributed with mean of 178.1 and standard deviation of 40.8. All units are in mg/100ml. Find two levels that cut off the top 10% and the bottom 10 % from the distribution of x.
Wednesday, October 30, 2013 at 9:48pm

statistics
p = 0.68 n = 800 µ = np µ = 800(.68) = 544 Standard deviation = √(np(1-p) ) = √(800(.68)(.32) ) = 13.1939 µ±2σ (544 -2(13.193), 544+2(13.1939)) (517.6, 570.4) 554 is not unusual because it is in interval.
Wednesday, October 30, 2013 at 8:26pm

Statistics/Math
Hey Michael 2 is wrong The correct answer is A
Wednesday, October 30, 2013 at 7:49pm

Statistics
z = (x -x bar)/ std dev/sqrt(n) z = (12.6-15)/ 6/sqrt(5) z = -0.89 .1867 z = (x -x bar)/ (std dev/sqrt(n)) z = (18.6-15)/ 6/sqrt(5) z= 1.34 .9099 .9909-.1867 = .8042
Wednesday, October 30, 2013 at 7:23pm

statistics
nPr 35!/(35-4)! = 35!/31! 35 * 34 * 33 * 32 * 31! / 31! = 1256640
Wednesday, October 30, 2013 at 7:13pm

statistics
A survey for brand recognition is done and it is determined that 68% of consumers have heard of Dull Computer Company. If a survey of 800 randomly selected consumers is to be held would it be unusual for 554 of them to recognize Dull Computer Company? Please show the work so I...
Wednesday, October 30, 2013 at 7:11pm

statistics
there are 35 members in a sports club. If an election is to be held to pick 4 officers; president, vice president, treasurer, and secretary, how many different lists of officers could result?
Wednesday, October 30, 2013 at 7:06pm

Statistics
The weights of the fish in a certain lake are normally distributed with a mean of 15lbs. and standard deviation of 6lbs. If a sample of 5 fish are taken from the lake, find the probability their means weights are between 12.6 lbs. and 18.6 lbs.
Wednesday, October 30, 2013 at 7:05pm

Statistics
A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a letter (costing about $0.45) asking the customer to pay. That worked 30% of the time. The bank wants to test a new method that involves ...
Wednesday, October 30, 2013 at 7:03pm

Statistics p-value
Is it 3.165?
Wednesday, October 30, 2013 at 6:59pm

Statistics/Math
Thank you, Kuai!
Wednesday, October 30, 2013 at 6:53pm

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