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April 20, 2014

April 20, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**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: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 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: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 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 /> 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70<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*

**Statistics**

Would the interval be 63.5 to 68.3?
*Wednesday, October 30, 2013 at 6:51pm*

**Statistics/Math**

1. B 2. B
*Wednesday, October 30, 2013 at 6:35pm*

**Statistics/Math**

1. B 2. B
*Wednesday, October 30, 2013 at 6:30pm*

**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 ...
*Wednesday, October 30, 2013 at 5:42pm*

**Statistics**

Formula: CI90 = p + or - (1.645)[√(pq/n)] ...where p = x/n, q = 1 - p, and n = sample size. Note: + or - 1.645 represents 90% confidence interval. p = .659 q = 1 - p = .341 n = 1026 I let you take it from here.
*Wednesday, October 30, 2013 at 5:36pm*

**Statistics p-value**

You can try a proportional one-sample z-test for this one since this problem is using proportions. Null hypothesis: Ho: p = .63 -->meaning: population proportion is equal to .63 Alternative hypothesis: Ha: p > .63 -->meaning: population proportion is greater than .63...
*Wednesday, October 30, 2013 at 5:24pm*

**Statistics p-value**

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 ...
*Wednesday, October 30, 2013 at 5:10pm*

**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...
*Wednesday, October 30, 2013 at 5:08pm*

**Statistics/Math**

I'm confused. Are you saying # 1 is more than, which is B? Or # 1 is more than and #2 is B?
*Wednesday, October 30, 2013 at 5:04pm*

**Statistics**

You will need to determine "degrees of freedom between" and "degrees of freedom within" before checking an ANOVA table using alpha level. Note: k = number of levels. To calculate df within: a) You have 4 levels. Your sample size is 23 Your alpha level ...
*Wednesday, October 30, 2013 at 4:44pm*

**Statistics/Math**

1. More than B
*Wednesday, October 30, 2013 at 3:51pm*

**Statistics/Math**

1. A magazine is considering the launch of an online edition. The magazine plans to go ahead only if it's convinced that more than 25% of the current readers would subscribe. The magazine contacted a simple random sample of 500 current subscribers and determine that 137 of...
*Wednesday, October 30, 2013 at 3:45pm*

**Statistics**

100 / 6 = 16.67 hours needed to code 100 records 16.67 / 7 = 2.38 FTEs
*Wednesday, October 30, 2013 at 2:57pm*

**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 ...
*Wednesday, October 30, 2013 at 2:08pm*

**Statistics**

Sorry, I meant FTEs (Full time equivalents)
*Wednesday, October 30, 2013 at 2:05pm*

**Statistics**

X-bar = 23000
*Wednesday, October 30, 2013 at 1:45pm*

**Statistics**

What is an FET?
*Wednesday, October 30, 2013 at 1:31pm*

**Statistics**

HIM department at Community Hospital will experience a 15 percent increase in the number of discharges coded per day as the result of opening a cardiac clinic in the facility. The 15 percent incrase is projected to be 100 additional records per day. The standard time to code ...
*Wednesday, October 30, 2013 at 1:27pm*

**Statistics**

According to internal testing done by the Get-A-Grip tire company, the lifetime of tires sold on new cars is normally distributed with a mean of 23,000 miles, with a standard deviation of 2500 miles. If the claim by Get-A-Grip is true, what is the mean of the sampling ...
*Wednesday, October 30, 2013 at 10:47am*

**Statistics**

Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4, with n...
*Wednesday, October 30, 2013 at 8:30am*

**Statistics**

Consider the following table for a single-factor ANOVA. Level of Factor Replicates 1 2 3 1 1 2 5 2 2 4 7 3 2 4 7 (a) Find x1,2. (b) Find x2,1. (c) Find C1. (d) Find x. (e) Find (Ci )2.
*Wednesday, October 30, 2013 at 8:29am*

**Statistics Math**

Amount of true variance to observed variance is 81 percent
*Wednesday, October 30, 2013 at 2:03am*

**Statistics Math**

With a reliability coefficient of 0.81, using classical test theory we would interpret that the: Answer a.Amount of error variance to observed variance is 81 percent b.Amount of true variance to observed variance is 81 percent c.Instrument has good enough reliability d....
*Tuesday, October 29, 2013 at 11:28pm*

**Statistics**

F = 4.67
*Tuesday, October 29, 2013 at 10:19pm*

**statistics**

Range = highest value -lowest value Range = 2400-73 Range = 2327 Variance = 343044.49 Standard deviation = 585.7
*Tuesday, October 29, 2013 at 8:58pm*

**Statistics**

Thanks for your help!
*Tuesday, October 29, 2013 at 8:54pm*

**Statistics**

(38-23) -+ 3.169* sqrt((30^2/23 +35^2/11) Lower limit -23.88 Upper limit 53.88
*Tuesday, October 29, 2013 at 8:52pm*

**Statistics**

State the null hypothesis, Ho, and the alternative hypothesis, Ha, that would be used to test these claims. < ¡Ü = ¡Ù ¡Ý > (a) There is an increase in the mean difference between posttest and pretest scores. Ho: ¦Ìd 0 Ha...
*Tuesday, October 29, 2013 at 8:45pm*

**Statistics**

Find the critical value for the hypothesis test, given the following. (Give your answer correct to two decimal places.) Ha: ó1 > ó2, with n1 = 13, n2 = 8, and á = 0.025 F=
*Tuesday, October 29, 2013 at 8:43pm*

**Statistics**

Find the 99% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.) Sample Number Mean ...
*Tuesday, October 29, 2013 at 8:42pm*

**Statistics/Math**

Answer. A
*Tuesday, October 29, 2013 at 8:21pm*

**Statistics**

Looks OK!
*Tuesday, October 29, 2013 at 7:04pm*

**Statistics/Math**

I want to test H0: p = .12 vs. Ha: p ≠ .12 using a test of hypothesis. This test would be called a(n) ____________ test. A) two-tailed B) right-tailed (this one?) C) left-tailed
*Tuesday, October 29, 2013 at 7:03pm*

**statistics**

List below are the duration (in hours) of a simple random sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time unusual? Why or hwy not? 73 95 238 199 166 268 198 374 260 235 382 339 ...
*Tuesday, October 29, 2013 at 6:46pm*

**Statistics**

Oldest Youngest Difference 174 168 6 173 169 4 169 175 -6 180 187 -7 51 53 -2 Sum of d = -5 d bar = -5/5 = -1 S = 5.83 n = 5 t = -1/[ (5.83/sqrt((5))] t = -.38 P-value = 0.7209
*Tuesday, October 29, 2013 at 5:39pm*

**Statistics**

What does mean? ƒÊd ‚ 0
*Tuesday, October 29, 2013 at 4:48pm*

**Statistics**

A new manager, hired at a large warehouse, was told to reduce the 26% employee sick leave. The manager introduced a new incentive program for the company's employees with perfect attendance. The manager decides to test the new program to see if it's better and plans to...
*Tuesday, October 29, 2013 at 4:32pm*

**Statistics**

Which of the following criteria must be met to do a one-proportion z- test? A. The data values in the sample must be dependent. B. The parent population must be normally distributed. C. The data must come from a random sample. D. The sample size must be more than 10% of the ...
*Tuesday, October 29, 2013 at 4:31pm*

**Statistics**

I glad to see your answer.
*Tuesday, October 29, 2013 at 4:26pm*

**Statistics**

Complete the hypothesis test with alternative hypothesis ƒÊd ‚ 0 based on the paired data that follows and d = O - Y. Use ƒ¿ = 0.01. Assume normality. Oldest 174 173 169 180 51 Youngest 168 169 175 187 53 (a) Find t. (Give your answer correct ...
*Tuesday, October 29, 2013 at 4:23pm*

**Statistics**

Thanks!!
*Tuesday, October 29, 2013 at 4:21pm*

**Statistics**

Sample n x G 375 324 H 414 333 n1 = 375 x1 = 324 p1 = x1/n1 = 324/375 = .864 n2 = 414 x2 = 333 p2 = x2/n2= 333/414 = .804 z = 2.24 p-value = .025
*Tuesday, October 29, 2013 at 4:13pm*

**Statistics**

H0: p1 = p2 Ha: p1 < p2 P1 = .28 p2 = .24 x1 = 200(.28) = 56 x2 = 200(.24) = 48 n1 = 200 n2 =200 z = -0.91 p-value = 0.1809 b. fail to reject the null hypothesis, there is not sufficient evidence that
*Tuesday, October 29, 2013 at 4:03pm*

**Statistics**

SSd = 6193- (231)^2/37 SSd = 4750.811 Sd = sqrt(SSd/n-1) Sd = sqrt(4750.811/36)) Sd = 11.488 Mean = 231/37 = 6.243 t = 6.243/11.488/sqrt((37)) t = 3.31 p-value = .0021
*Tuesday, October 29, 2013 at 3:16pm*

**Business Statistics**

44%
*Tuesday, October 29, 2013 at 2:42pm*

**Statistics**

Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G 375 324 H 414 333
*Tuesday, October 29, 2013 at 1:54pm*

**Statistics**

Help Me Please! In a survey of families in which both parents work, one of the questions asked was, "Have you refused a job, promotion, or transfer because it would mean less time with your family?" A total of 200 men and 200 women were asked this question. "Yes...
*Tuesday, October 29, 2013 at 1:53pm*

**Statistics**

Please Help! If someone could just show me how to do a problem like this! The corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan. The data collected are summarized below, where d is the amount of corrosion on the ...
*Tuesday, October 29, 2013 at 1:51pm*

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