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April 20, 2014

April 20, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**STATS**

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 (.025) related to the Z score. Insert Z and other values into above equation.
*Wednesday, February 12, 2014 at 12:56pm*

**Statistics**

Is Z = +1 the same as the mean? That should give you the answer.
*Wednesday, February 12, 2014 at 12:51pm*

**statistics, math, college**

if np >5 and nq>5 estimate P (fewer than 4) with n=13 p=0.4 by using normal distribution as an approximate to the binomial distribution if np <5 or nq< then state that the normal approximation is not suitable
*Tuesday, February 11, 2014 at 7:37pm*

**us equality essay edit**

The United States DEFINES itself as one unified nation, indivisible, with liberty and justice for all. So WE ASK - are the citizens of such an independent country truly free? The Constitution of the United States does not provide equality for the people. Since the being of ...
*Tuesday, February 11, 2014 at 7:03pm*

**us equality essay edit**

its a rough draft and obviously isnt the entire thing The United States has diagnosed itself as one unified nation, indivisible, with liberty and justice for all. So cultivates the question- are the citizens of such an independent country truly free? The validity of the United...
*Tuesday, February 11, 2014 at 6:32pm*

**Statistics**

The mean of a distribution of 1000 individuals' blood pressure is 85. If this number were translated into a Z score it would be equal to +1 standard deviations. True or False? I know to calculate a Z score the formula is Z= (X-sub-i minus the mean)/ standard deviation. the...
*Tuesday, February 11, 2014 at 4:05pm*

**Statistics**

I found the mean but i do not know what the scores are. help. thanks
*Tuesday, February 11, 2014 at 3:31pm*

**STATS **

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. Using the 68-95-99.7 rule, what is the lower bound for the weight of the top 2.5% of students?
*Tuesday, February 11, 2014 at 1:35pm*

**Statistics**

My bad. Thanks.
*Tuesday, February 11, 2014 at 12:31pm*

**STATS**

Yes! Thanks. :) I have one more question. Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. Using the 68-95-99.7 rule, what is the lower bound for the weight of the top 2.5% of students.
*Tuesday, February 11, 2014 at 11:28am*

**Statistics (?)**

What is question 19? You cannot use copy and paste here.
*Tuesday, February 11, 2014 at 11:27am*

**statistics**

No, since the value is above the mean, it would be less than 50%. 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.
*Tuesday, February 11, 2014 at 11:26am*

**Research and Statistics**

What does it mean? https://www.google.com/search?client=safari&rls=en&q=truncated+range+statistics&ie=UTF-8&oe=UTF-8
*Tuesday, February 11, 2014 at 11:22am*

**Statistics**

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.45) and its Z score. Insert the Z value in your equation and solve for x.
*Tuesday, February 11, 2014 at 11:20am*

**statistics (?)**

What is your question?
*Tuesday, February 11, 2014 at 10:48am*

**statistics, math, college**

assume that adults have I.Q scores that are normally distributed with a mean of 100 and a standard deviation 15. find p2 which is the IQ score seperating bottom 2% from the top 98%
*Tuesday, February 11, 2014 at 10:46am*

**Behavioral Statistics**

Ho: mean = 40,000 H1: mean > 40,000 Z = (score-mean)/SEm SEm = SD/√n Since you are only concerned with greater than 40,000, you will reject Ho if Z falls in the top 5%. Find table in the back of your statistics text labeled something like "areas under normal ...
*Tuesday, February 11, 2014 at 10:33am*

**Statistics in Psychology**

19. You measure how much people are initially attracted to a person of the opposite sex and how anxious they become during their first date. For the following ratio data, answer the questions below. Participant Attraction X Anxiety Y 1 2 8 2 6 14 3 1 5 4 3 8 5 6 10 6 9 15 7 6 ...
*Monday, February 10, 2014 at 10:52pm*

**Behavioral Statistics**

I need someone to explain HOW to do this..I don't want just the answer I have got to figure out how to do this before my mid-term, and I'm completely clueless! 3. One of the major U.S. tire makers wishes to review its warranty for their rainmaker tire. The warranty is ...
*Monday, February 10, 2014 at 9:23pm*

** statistics**

The assets(in billions of dollars) of the four wealthiest people in a particular country are 43,25,21,15 assume that samples of size n=2 are randomly selected
*Monday, February 10, 2014 at 8:00pm*

**statistics**

2.28%
*Monday, February 10, 2014 at 7:55pm*

**statistics**

CI95 = mean ± 1.96 (sd/√n) CI99 = mean ± 2.58 (sd/√n) With your data: CI95 = 170 ± 1.96 (62.3/√100) CI99 = 170 ± 2.58 (62.3/√100) I'll let you finish the calculations for the confidence intervals.
*Monday, February 10, 2014 at 5:27pm*

**Statistics**

Using an online calculator, I found the following: 10 data pairs (x,y): ( 10.0 , 7.00 ); ( 8.00 , 6.00 ); ( 9.00 , 11.0 ); ( 6.00 , 4.00 ); ( 5.00 , 5.00 ); ( 3.00 , 7.00 ); ( 7.00 , 4.00 ); ( 2.00 , 5.00 ); ( 4.00 , 6.00 ); ( 1.00 , 4.00 ); Regression equation: Predicted y...
*Monday, February 10, 2014 at 5:16pm*

**STATS**

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. B. What percent of students have weights greater than 80.1 kilograms?
*Monday, February 10, 2014 at 4:02pm*

**Statistics**

A researcher measures how positive a person’s mood is and how creative he or she is, obtaining the following interval scores: Participant Mood X Creativity Y 1 10 7 2 8 6 3 9 11 4 6 4 5 5 5 6 3 7 7 7 4 8 2 5 9 4 6 10 1 4 (a) Compute the statistic that summarizes this ...
*Monday, February 10, 2014 at 3:49pm*

**STATS **

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. A. 45% of the student weights are above ____ kilograms? Z=.3264=x-75.5/10.3 Now what?
*Monday, February 10, 2014 at 3:17pm*

**Statistics**

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. A. 45% of the student weights are above ____ kilograms? Z=.3264=x-75.5/10.3 Now what? I am lost! Please help me! Thanks!
*Monday, February 10, 2014 at 2:12pm*

**Statistics**

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. A. 45% of the student weights are above ____ kilograms? Z=.3264=x-75.5/10.3 Now what? I am lost! Please help me! Thanks!
*Monday, February 10, 2014 at 2:12pm*

**Research and Statistics**

What does truncated range?
*Monday, February 10, 2014 at 2:10pm*

**statistics**

The test scores of students in a class test have a mean of 65 and with a standard deviation of 8. What is the probable percentage of students scored more than 70? Please check work 70-65/8 = .625 = .2357 = 1.-.2357 = .7643 ANSWER 76% ????
*Monday, February 10, 2014 at 2:06pm*

**Statistics**

(a) For the relationship in question 19, what is the proportion of variance accounted for? (b) What is the proportion of variance not accounted for? (c) Why or why not is this a valuable relationship?
*Monday, February 10, 2014 at 2:02pm*

**Research and Statistics**

What factors influence the size of the t-statistics( mean difference, variance, sample size) and which way?
*Monday, February 10, 2014 at 1:47pm*

**Statistics in Psychology**

A correlation coefficient cannot exceed ± 1. From your data, neither would be useful.
*Monday, February 10, 2014 at 1:34pm*

**Statistics in Psychology**

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.
*Monday, February 10, 2014 at 1:31pm*

**statistics**

Z = (score-mean)/SD Solve for Z.
*Monday, February 10, 2014 at 1:30pm*

**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.
*Monday, February 10, 2014 at 1:27pm*

**Research and Statistics**

Null hypothesis assumes no difference, while the alternative assumes some difference. Ho: x = y Ha: x ≠ y
*Monday, February 10, 2014 at 1:26pm*

**Statistics in Psychology**

A researcher finds that the correlation between variable A and variable B is r= 5 1.20. She also finds that the correlation between variable C and variable B is r= 5 2.40. Which relationship is scientifically more useful and by how much?
*Monday, February 10, 2014 at 1:18pm*

**Statistics in Psychology**

What research steps must you go through to use the relationship between a person’s intelligence and grade average in high school so that, if you know a person’s IQ, you can more accurately predict the person’s grade average?
*Monday, February 10, 2014 at 1:17pm*

**STATISTICS**

Find a relatively large group of students, get their IQ and grade average, and do a correlation coefficient. To know the value of either variable, use a scatter diagram to find the other.
*Monday, February 10, 2014 at 1:16pm*

**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.
*Monday, February 10, 2014 at 1:13pm*

**statistics**

Population Mean: 170 STD: 62.3 Sample size 100 95% CI 99%CI
*Monday, February 10, 2014 at 1:12pm*

**statistics**

You have an observation of 55, a population mean of 48, and a standard deviation of 1.85. Therefore, the z-score would be:
*Monday, February 10, 2014 at 1:10pm*

**statistics**

The space shuttle is launched 9 times a year with a break down occurring 1/10 of the time. What is the probability that two randomly selected space shuttles launched 9 times a year and both having accidents occurring in that year?
*Monday, February 10, 2014 at 1:08pm*

**statistics**

Z = (score-mean)/SD
*Monday, February 10, 2014 at 1:07pm*

**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.
*Monday, February 10, 2014 at 1:06pm*

**Statistics**

Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question. Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find...
*Monday, February 10, 2014 at 1:04pm*

**UNM**

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. A. 45% of the student weights are above ____ kilograms? B. What percent of students have weights greater than 80.1 kilograms? C. What percent of ...
*Monday, February 10, 2014 at 12:41pm*

**UNM**

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. 45% of the students weights are above what kilograms?
*Monday, February 10, 2014 at 12:36pm*

**UNM **

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. What percent of students have weights greater than 80.1 kilograms?
*Monday, February 10, 2014 at 12:35pm*

**UNM**

Suppose that the average weight of students in a statistics class is 75.5 kilograms with a standard deviation of 10.3 kilograms. 42% of the students weights are above what kilograms?
*Monday, February 10, 2014 at 12:24pm*

**statistics**

Provide the Z score and the critical value. Raw score of 112, population mean 89, Std. of the population (22.8)
*Monday, February 10, 2014 at 12:03pm*

**statistics**

The test scores of students in a class test have a mean of 65 and with a standard deviation of 8. What is the probable percentage of students scored more than 70?
*Monday, February 10, 2014 at 12:02pm*

**Statistics**

a. 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 = square root of variance b. Z = (score-mean)/SD...
*Monday, February 10, 2014 at 11:56am*

**statistics**

A multiple choice exam has 20 questions; there are four choices for each question. A student guesses the answer to every question. Find the chance that he guesses correctly between four and seven times. Find the minimum score the instructor can set so that the probability that...
*Monday, February 10, 2014 at 11:50am*

**Statistics**

Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. For 15 subjects, the results were SumX=1008, and Sum(X-M)^2=140.4. Use this information to answer the following: a. What is the mean and SD for this data? b. Based on the data you ...
*Monday, February 10, 2014 at 11:27am*

**Statistics**

Age at onset of dementia was determined for a sample pf adults between the ages of 60 and 75. For 15 subjects, the results were SumX=1008, and Sum(X-M)^2=140.4. Use this information to answer the following: a. What is the mean and SD for this data? b. Based on the data you ...
*Monday, February 10, 2014 at 9:03am*

**STATISTICS**

What research steps must you go through to use the relationship between a person’s intelligence and grade average in high school so that, if you know a person’s IQ, you can more accurately predict the person’s grade average?
*Monday, February 10, 2014 at 5:29am*

**Physics**

You buy yourself a new Lamborghini which can accelerate from 0 to 62 mph in 2.5 seconds. 1.) what is the magnitude of the car's acceleration in SI units? 2.)the latest figures on speeding related car accident fatalities show 32788 deaths per year in the united states. in ...
*Sunday, February 9, 2014 at 8:31pm*

**Statistics**

bbb
*Sunday, February 9, 2014 at 7:59pm*

**statistics**

p = .4 so (1-p) = .6 binomial distribution n = 6 k = 4 C(n,k) = n!/[ k! (n-k)! ] = 6!/[4!(2!)] = 6*5/ 2 = 15 P(n,k) = 15 * p^k * (1-p)^(n-k) =15 * .4^4 * .6*2 = .1152
*Sunday, February 9, 2014 at 6:27pm*

**statistics**

Find the probability that among six randomly selected people, exactly four of them have brown eyes. Assume that 40% of the population has brown eyes
*Sunday, February 9, 2014 at 6:15pm*

**Research and Statistics**

Explain how to accept and reject the null? How to identify the null and alternative hypothesis for t-tests in both statistical and experimental hypothesis?
*Sunday, February 9, 2014 at 3:38pm*

**statistics**

The height of an adult male is known to be normally distributed with a mean of 69 inches and a standard deviation of 2.5 inches. The height of the doorway is 74 inches. What proportion of adult males will not fit under the door?
*Sunday, February 9, 2014 at 2:11pm*

**Data apps and healthcare statistics**

Since this is not my area of expertise, I searched Google under the key words "information systems healthcare delivery" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=information+systems+healthcare+delivery&ie=UTF-8&...
*Sunday, February 9, 2014 at 11:56am*

**Data apps and healthcare statistics**

what are the categories of information systems, examples of each and their roles in the healthcare delivery
*Sunday, February 9, 2014 at 1:32am*

**statistics**

So if you criterion is that any student counts plus any female student or not then it is (8 + 7 + 5)/27
*Saturday, February 8, 2014 at 5:35pm*

**statistics**

I have the same question but perhaps I I list the four categories that the 27 students fit into you can figure it out yourself: a) 7 males (not student) b) 8 male students c) 7 female students d) 5 females (not student) so males not student = 7/27 male students = 8/27 female ...
*Saturday, February 8, 2014 at 5:32pm*

**statistics - eh?**

what does "or also" mean?
*Saturday, February 8, 2014 at 5:14pm*

**statistics**

Suppose a Stat 1450 web class has 15 males (8 are also students at OSU) and 12 females (7 are also students at OSU). What is the probability that a randomly selected student is either female, or also a student at OSU? Submit answer in decimal form and round to the nearest ...
*Saturday, February 8, 2014 at 5:10pm*

**Statistics**

If you are talking "P(X)", isn't that probability?
*Saturday, February 8, 2014 at 1:19pm*

**statistics**

W - wrong R - right a) prob RRR = (1/3)(1/3)(1/3) = 1/27 b) prob WWW = (2/3)^3 = 8/27 c) 2 right could be WRR, RWR, or RRW prob(of that) = 3 x (2/3)(1/3)^2 = 6/27 (notice the other case is 2 wrong prob of that = 3(1/3)(2/3)^2 = 12/27 and notice that 1/27 + 8/27 + 6/27 + 12/27...
*Friday, February 7, 2014 at 11:18pm*

**statistics**

A multiple choice test has 3 questions and each question has 3 choices. If Nacho takes this test, what is the probability that he will: (a)answer all questions correctly? (b)answer all questions wrong? (c)answer two questions correctly?
*Friday, February 7, 2014 at 11:05pm*

**statistics**

I use this fantastic webpage for these kind of questions http://davidmlane.com/hyperstat/z_table.html enter the mean and SD, click on "between" and enter 69 and 70 to get .1779
*Friday, February 7, 2014 at 10:21pm*

**statistics**

a sample of men's heights was taken. The average height was 68.5 inches, the SD was 1.95 inches. Use the normal curve to estimate the percentage of men with heights between 69 inches and 70 inches.
*Friday, February 7, 2014 at 10:11pm*

**Statistics**

Determine if the following are probability distributions (if no, state why). a. X 3 6 9 12 15 P(X) 4/9 2/9 1/9 1/9 1/9
*Friday, February 7, 2014 at 7:06pm*

**STATISTICS**

Are these all the young adults playing Pokémon? Then it is a population.
*Friday, February 7, 2014 at 6:16pm*

**statistics (?)**

Data lacking. What are the mean, standard deviation and n for the sample?
*Friday, February 7, 2014 at 5:34pm*

**Statistics**

False False True
*Friday, February 7, 2014 at 5:22pm*

**Statistics**

If the population is normally distribution then the sample must be normally distributed even for small sample size? True or False. The variance of the standard normal distribution is always equal to 1.? True or False. A continuous random variable may not be normally ...
*Friday, February 7, 2014 at 4:25pm*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*Friday, February 7, 2014 at 4:23pm*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*Friday, February 7, 2014 at 4:15pm*

**statistics**

how do the 4th grade girls weight in principal ben's school compare to the national mean weigh = 90 sd=15
*Thursday, February 6, 2014 at 9:58pm*

**Statistics**

For part a: Use the appropriate hypothesis test for your data. For part b: Cohen's d is the difference between two means divided by a standard deviation. Calculate Cohen's d (d) and the effect-size correlation (r) using the following formulas: d = (M1 - M2) / s r = d...
*Thursday, February 6, 2014 at 6:09pm*

**Statistics**

I thought college students knew the difference between the name of their school and the name of their school subject. (Sigh!)
*Thursday, February 6, 2014 at 5:12pm*

**statistics**

4
*Thursday, February 6, 2014 at 4:52pm*

**Statistics**

D
*Thursday, February 6, 2014 at 4:21pm*

**statistics**

√-2 = √-1(√2) √-1 = i (imaginary number) √2 = 1.41
*Thursday, February 6, 2014 at 1:05pm*

**Statistics**

jj
*Thursday, February 6, 2014 at 11:10am*

**statistics**

a
*Thursday, February 6, 2014 at 11:09am*

**statistics**

howdo i find the square root of -2
*Thursday, February 6, 2014 at 12:27am*

**Statistics**

Identify whether the variable in the information below is qualitative or quantitative. The archeological site of Tara is more than 4000 years old. Tradition states that Tara was the seat of the high kings of Ireland. Because of its archeological importance, Tara has received ...
*Thursday, February 6, 2014 at 12:23am*

**Statistics**

Identify whether the variable in the information below is qualitative or quantitative. The archeological site of Tara is more than 4000 years old. Tradition states that Tara was the seat of the high kings of Ireland. Because of its archeological importance, Tara has received ...
*Thursday, February 6, 2014 at 12:23am*

**Probability and statistics**

how much will the squirrel expect to have
*Wednesday, February 5, 2014 at 4:20pm*

**statistics**

A neuropsychologist is interested only in studying the most deviant portion of this population, that is, those individuals who fall within the top 10% and the bottom 10% of the distribution. She must determine the ages that mark these boundaries. What are these ages?
*Wednesday, February 5, 2014 at 11:29am*

**MATH**

continuous, because you can get smaller and smaller intervals. 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 each of the Z scores.
*Wednesday, February 5, 2014 at 11:24am*

**statistics**

m
*Tuesday, February 4, 2014 at 7:26pm*

**statistics**

A study was conducted to count the different age groups of kids that usually play in a park on a Sunday morning. The following data was collected Years Old Number of Kids 1 3 2 22 3 8 4 16 5 9 a) List the simple events of the experiment. b) What is the probability of each ...
*Tuesday, February 4, 2014 at 6:00pm*

**statistics**

A study was conducted to count the different age groups of kids that usually play in a park on a Sunday morning. The following data was collected Years Old Number of Kids 1 3 2 22 3 8 4 16 5 9 a) List the simple events of the experiment. b) What is the probability of each ...
*Tuesday, February 4, 2014 at 5:59pm*

**STATISTICS**

1. 28 young adults are asked how much time they spend, in minutes, per week on Pokémon. Their responses are shown below. 96 17 97 35 24 57 27 34 87 5 21 87 6 52 2 66 18 29 84 39 19 37 63 58 39 10 51 75 QUESTION IS THIS SAMPLE OR POPULATION?
*Tuesday, February 4, 2014 at 11:04am*

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