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April 18, 2014

April 18, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**statistics,math**

Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection. Be very specific in your presentation
*Sunday, September 29, 2013 at 1:06am*

**Reading Honors**

so like this A good argument is persuading, effective, and reasonable, but a powerful argument has much more. The newspaper argument is more effective than traditional school calendar argument for many reasons. Not only does it have more evidence and supporting details, but it...
*Saturday, September 28, 2013 at 1:41pm*

**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 (±.4750) and the related Z scores. Insert Z scores both into the equation above.
*Saturday, September 28, 2013 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.
*Saturday, September 28, 2013 at 1:26pm*

**Reading Honors**

i did some grammer check and i got this also the teacher said to use "newspaper argument" since its a letter and it doesn't have a title. the other one does it is "summer:15 days or 2 1/12 months?" A good argument is persuading, effective, and ...
*Saturday, September 28, 2013 at 10:32am*

**Reading Honors**

is this a good essay. please help me on words that will make the essay better, advice if any sentence is wrong. and anything that can make the essay sound more mature/professional than what it is, punctuation, capitalization, clarity, etc. A good argument is convincing, ...
*Saturday, September 28, 2013 at 9:30am*

**Statistics**

.9
*Saturday, September 28, 2013 at 2:21am*

**Statistics**

.9
*Saturday, September 28, 2013 at 2:20am*

**statistics**

A Social service agency plans to conduct a survey to determine the mean income of its clients. The director of the agency prefers that you measure the mean income very accurately, to within plus or minus $500. from a sample taken 2 years ago, you estimate that the standard ...
*Friday, September 27, 2013 at 9:01pm*

**statistics**

Calculate the difference between the means distribution parameters? where n1=25,n2=36, s2 1 = 50, s 2 2 = 72, M1= 100, & M2 = 105
*Friday, September 27, 2013 at 8:06pm*

**statistics**

. The average age at which a woman gets married in the U.S. is µ = 27 with a standard deviation of σ = 5.5. Use this information to answer the following questions. Show Your Work! A. What proportion marries at age 30 or more?
*Friday, September 27, 2013 at 7:40pm*

**statistics**

The typical amount of sleep per night for undergraduate college students has a bell shaped distribution with a mean of 7 and a standard deviation of 1.90 hours. Based on this distributional information we can conclude that at least 95 % of this population sleep ...
*Friday, September 27, 2013 at 5:46pm*

**statistics**

assuming you meant 3.5%, then the new pay will be 13.65 * 1.035
*Friday, September 27, 2013 at 5:31pm*

**ms.sue please help!!!**

Ms. Sue is this a good essay. please help me on words that will make the essay better, advice if any sentence is wrong. and anything that can make the essay sound more mature/professional than what it is, punctuation, capitalization, clarity, etc. A good argument is convincing...
*Friday, September 27, 2013 at 5:24pm*

**statistics**

An employee currently earning $13.65 per hour has been awarded a 3.5 merit raise. what is the employee hourly salary be with this increase.
*Friday, September 27, 2013 at 3:30pm*

**statistics**

Most Americans, 75% in fact, say frequent handwashing is the best way to fend off the flu. Despite that, when using public restrooms, women wash their hands only 67% of the time and men wash only 46% of the time. Of the adults using the public restroom at a large grocery chain...
*Thursday, September 26, 2013 at 4:51pm*

**statistics - conditional probability**

Event A has probability 0.9 of occurring. Event B has 0.2 chance of occurring if, and only if, event A has occurred. What is the overall probability that event B will occur? I'm so confused. This seems so simple, I'm not sure why I can't reason through it. They'...
*Wednesday, September 25, 2013 at 10:20pm*

**statistics - conditional probability**

Event A has probability 0.9 of occurring. Event B has 0.2 chance of occurring if, and only if, event A has occurred. What is the overall probability that event B will occur? I'm so confused. This seems so simple, I'm not sure why I can't reason through it. They'...
*Wednesday, September 25, 2013 at 10:19pm*

**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 between the two Z scores.
*Wednesday, September 25, 2013 at 5:24pm*

**statistics**

Use same process as indicated in your following post.
*Wednesday, September 25, 2013 at 12:58pm*

**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.
*Wednesday, September 25, 2013 at 12:57pm*

**statistics**

A set of final exam scores in an organic chemistry course was found to be normally distributed, with a mean of 73 and a standard deviation of 8. What is the probability of getting a score higher than 71 on this exam?
*Tuesday, September 24, 2013 at 10:51pm*

**statistics**

A popular retail store knows that the purchase amounts by its customers is a random variable that follows a normal distribution with a mean of $30 and a standard deviation of $9. What is the probability that a randomly selected customer will spend between $20 and $35 at this ...
*Tuesday, September 24, 2013 at 10:47pm*

**statistics**

gas mileage
*Tuesday, September 24, 2013 at 12:04am*

**statistics**

air coin is flipped 20 times. a. Determine the probability that the coin comes up tails exactly 15 times. b. Find the probability that the coin comes up tails at least 15 times. c. Find the mean and standard deviation for the random variable X giving the number of tails in ...
*Monday, September 23, 2013 at 9:19pm*

**statistics**

suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 and a standard deviation of 0.43. Using the empirical rule, what percentage of students have grade point averages that are between 1.26 and 3.84
*Monday, September 23, 2013 at 9:10pm*

**Statistics**

X = {24,31,16,22,22} µ(X) = 23 X-µ = {1,8,-7,-1,-1} n ∑(Xi-µ)^2 / (n-1) i=1 ∑(X-µ)^2 / 4 = (1+64+49+1+1)/5 = 116/4 = 29
*Sunday, September 22, 2013 at 7:16pm*

**Statistics**

Which of the following is not a source of caution in regression analysis between two variables? A) non-linear form. B) linear form. C) a lurking variable. D) an outlier. E) extrapolation. E?
*Sunday, September 22, 2013 at 3:39pm*

**Statistics**

Find the variance for the set of data: 24, 31, 16, 22,22.
*Sunday, September 22, 2013 at 3:39pm*

**question**

Take all of the hard classes you can. That includes physics, chemistry, AP statistics and precalculus. Your counselor can advise you better about when to take these subjects.
*Sunday, September 22, 2013 at 1:26pm*

**question**

is it better to take physics or chemistry if taking both whats better to take 1st in sophomore year better to take ap statistics or precalculas for becoming an architect
*Sunday, September 22, 2013 at 1:05pm*

**statistics**

"equilibrium" = equals 15x-900 = 2x+530 Solve for x.
*Saturday, September 21, 2013 at 7:22pm*

**statistics**

What is the mean? What is the standard deviation? You need a little more information to answer the question.
*Saturday, September 21, 2013 at 5:12pm*

**Statistics**

How about a one-sample t-test? Usually you use z-tests when sample sizes are large (n is greater than or equal to 30) whether or not you know the population standard deviation. If you do not know the population standard deviation and have a small sample (n < 30), then you ...
*Saturday, September 21, 2013 at 5:08pm*

**Statistics**

2. A researcher hypothesized that the pulse rates of long-distance athletes differ from those of other athletes. He believed that the runners’ pulses would be slower. He obtained a random sample of 10 long-distance runners. He measured their resting pulses. Their pulses ...
*Saturday, September 21, 2013 at 1:59pm*

**statistics**

if anxiety scores were recorded as Z score or 1.10, is that higher than 35 in the current study?
*Saturday, September 21, 2013 at 1:31pm*

**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 for each Z score.
*Saturday, September 21, 2013 at 1:10pm*

**statistics**

if a toaster ovens hav an average life expectancy of 9.5 years with a standard deviation of 4.75 years. what is the probability that a toaster oven will last twenty years or will fail in one year or less?
*Saturday, September 21, 2013 at 12:36pm*

**Math**

Part I: Statistical Measures Statistics is a very powerful topic that is used on a daily basis in many situations. For example, you may be interested in the age of the men who attend Silver’s Gym. You could not assume that all men are the same age. Thus, it would be an ...
*Friday, September 20, 2013 at 8:10pm*

**statistics**

Use a probability tree: Next person male: 42% wash his hands: 43% female: 58% wash her hands 66% P(wash)=42%*43% + 58%*66% =0.5634
*Friday, September 20, 2013 at 7:33pm*

**Statistics (Please help!!!)**

See your other post.
*Friday, September 20, 2013 at 6:41pm*

**Statistics- Multiple Choice Question**

I would say A if the exposure misclassification is not related to the individual's disease status. Check this!
*Friday, September 20, 2013 at 6:41pm*

**statistics**

supply function p = 15x-900 demand function p = 2x + 530 find the point of equilibrium
*Friday, September 20, 2013 at 6:38pm*

**statistics**

Most Americans, 67% in fact, say frequent handwashing is the best way to fend off the flu. Despite that, when using public restrooms, women wash their hands only 66% of the time and men wash only 43% of the time. Of the adults using the public restroom at a large grocery ...
*Friday, September 20, 2013 at 6:31pm*

**Statistics**

A. Ho: Time ≥ 3 Ha: Time < 3 B. Ho: mpg < ad Ha: mpg ≥ ad
*Friday, September 20, 2013 at 5:15pm*

**statistics**

64.8
*Friday, September 20, 2013 at 3:14pm*

**Statistics**

Determine the Null and Alternative Hypothesis for the following: A.) A company manufactures flares, they select 100 at random to determine if the flares last at least 3 hours on average. B.) A consumer group believes that a new sports coupe gets significantly less MPG than ...
*Friday, September 20, 2013 at 1:28pm*

**Statistics- Multiple Choice Question**

The investigators suspect that military men may not tell the truth about visiting a CSW. Some may say they did visit a CSW when they actually did not; others will say they did not visit a CSW when they actually did. Is this: A. Nondifferential misclassification of exposure B. ...
*Thursday, September 19, 2013 at 9:50pm*

**Statistics (Please help!!!)**

The investigators suspect that military men may not tell the truth about visiting a CSW. Some may say they did visit a CSW when they actually did not; others will say they did not visit a CSW when they actually did. Is this: A. Nondifferential misclassification of exposure B. ...
*Thursday, September 19, 2013 at 9:29pm*

**stastistics (?)**

What intervals? Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities between your Z scores.
*Thursday, September 19, 2013 at 10:58am*

**statistics**

In terms of income, the deviant scores are generally the highest ones. The mean, functioning as a fulcrum or balance point, is most effected by deviant scores.
*Thursday, September 19, 2013 at 10:46am*

**Statistics**

A golf ball is dropped from 15 different heights (in inches) and the height of the bounce is recorded (in inches.) The regression analysis gives the model y-hat = -0.4 + 0.70 (drop height) where y-hat is the predicted bounce height of the golf ball. A golf ball dropped from 71...
*Wednesday, September 18, 2013 at 7:40pm*

**Statistics**

A carload of stone taken from a quarry by the plug-and-feather method contains pieces of stone have a mean weight of 1,500 pounds and a total weight of 36,000 pounds. Another carload of stone produced by the explosive method (where stone is blasted into random shapes by ...
*Wednesday, September 18, 2013 at 6:21pm*

**Statistics**

Since only one of the two teams competing can win, 1/2.
*Wednesday, September 18, 2013 at 6:12pm*

**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.
*Wednesday, September 18, 2013 at 2:26pm*

**question**

Take all of the hardest classes that you can. Both statistics and precalculus will be valuable.
*Wednesday, September 18, 2013 at 11:17am*

**statistics**

Because of the smoking breaking the law
*Wednesday, September 18, 2013 at 8:34am*

**statistics**

Because of the smoking breaking the law
*Wednesday, September 18, 2013 at 8:33am*

**question**

im a freshmen and i wan to become a architect what courses should i take in highschool and is it beter to take statistics or precalculas
*Tuesday, September 17, 2013 at 11:21pm*

**statistics**

The international bottled water association says that Americans on the average drink 4.6 (8oz) servings of water a day. Assume that the number of 8oz. servings of water is approximately normally distributed with a standard deviation of 1.8 servings what proportion of Americans...
*Tuesday, September 17, 2013 at 9:26pm*

**Statistics**

If someone makes random guesses for each NCAA Basketball Tournament game, what is the probability of picking the winner in each game?
*Tuesday, September 17, 2013 at 3:54pm*

**statistics**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. .70 * .70 = ?
*Tuesday, September 17, 2013 at 2:17pm*

**statistics**

.65 * .20 = ?
*Tuesday, September 17, 2013 at 2:15pm*

**statistics**

Where'd the 12 come from? PLEASE HELP!
*Tuesday, September 17, 2013 at 4:21am*

**statistics**

I get .27 but that's not an answer choice.
*Monday, September 16, 2013 at 6:09pm*

**statistics**

Based on published real estate research, 65% of homes for sale have garages, 20% have swimming pools, and 18% have both features. i. Given that a home for sale has a garage, what’s the probability that it also has a pool
*Monday, September 16, 2013 at 6:08pm*

**statistics**

I got 2 percent for number two. But I can't solve for number one. Is it 60%?
*Monday, September 16, 2013 at 5:44pm*

**statistics**

You and your friend decide to get your cars inspected. You are informed that 70% of cars pass inspection. If the event of your car’s passing is independent of your friend’s car: iii. What is the probability that both of the cars pass inspection (6 points)? a. 60% b. ...
*Monday, September 16, 2013 at 5:32pm*

**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 (.025) related to a Z score. Insert the Z score and other data in the equation above and solve for the score.
*Monday, September 16, 2013 at 3:17pm*

**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, September 16, 2013 at 2:54pm*

**statistics**

Z = (score-mean)/SD Find the Z score for 750 on SAT. Insert that Z score with the data for the ACT to find the equivalent score.
*Monday, September 16, 2013 at 2:39pm*

**statistics**

Suppose scores on the mathematics section of the SAT follow a normal distribution with mean 540 and standard deviation 120. ACT math scores are normally distributed with a mean of 18 and a standard deviation of 8. What score on the ACT is equivalent to a score of 750 on the ...
*Monday, September 16, 2013 at 1:46pm*

**statistics**

Suppose scores on the mathematics section of the SAT follow a normal distribution with mean 540 and standard deviation 120. ACT math scores are normally distributed with a mean of 18 and a standard deviation of 8. What score on the ACT is equivalent to a score of 750 on the SAT
*Sunday, September 15, 2013 at 11:07pm*

**Statistics**

The annual snowfall in a town can be represented by the Normal model N(46, 6.8). In about 2.5% of the years, the annual snowfall in this town will exceed: A) 46 inches B) 39.2 inches C) 52.8 inches D) 59.6 inches E) 66.4 inches I don't know how to set this problem up to ...
*Sunday, September 15, 2013 at 4:26pm*

**statistics---DBA**

probably statistics
*Saturday, September 14, 2013 at 2:44pm*

**Statistics **

Here's the five- number summary for the distribution of cigarette taxes (in cents) among the 50 states and Washington, D.C. in the United States. Min. = 2.5, Q1= 36, Median = 60, Q3= 100, Max. = 205 About what proportion of the states have cigarette taxes (i) greater than ...
*Saturday, September 14, 2013 at 8:21am*

**STATISTICS**

If I've interpreted this statement correctly, I would say "true" because there may be less confidence in the predictive value of the regression line. This might also have adverse implications in real world applications.
*Friday, September 13, 2013 at 8:23pm*

**Psy**

Usually you use z-tests when sample sizes are large (n is greater than or equal to 30) whether or not you know the population standard deviation. If you do not know the population standard deviation and have a small sample (n < 30), then you can use t-tests. T-tests for ...
*Friday, September 13, 2013 at 7:36pm*

**sTATISTICS**

You are estimating the contractor’s material handling cost as a factor of the material cost. After examining 6 previous contracts you have the percentage (factor) for each contract: 2.5% 6.2% 3.2% 12.9% 7.0% 15.3%
*Friday, September 13, 2013 at 6:18pm*

**STATISTICS**

TRUE OR FALSE? Simple regression cannot be applied when r of two variables is very low.
*Friday, September 13, 2013 at 2:22pm*

**statistics (?)**

By "x+/-2s", do you mean "x±2s"? What does x stand for?
*Friday, September 13, 2013 at 12:04pm*

**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.
*Friday, September 13, 2013 at 11:40am*

**Statistics**

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. It will be the larger portion.
*Friday, September 13, 2013 at 11:39am*

**Statistics**

I have no idea on how to answer this question... "Use technology or a standard normal distribution table to find the area to the left of z=1.58. Do I plug in 1.58 in my calculator to find the answer?
*Friday, September 13, 2013 at 10:54am*

**Statistics**

I have no idea on how to answer this question... "Use technology or a standard normal distribution table to find the area to the left of z=1.58. Do I plug in 1.58 in my calculator to find the answer?
*Friday, September 13, 2013 at 10:46am*

**statistics**

A sample of 106 students, the researchers reported the following statistics...mean= 13.2 s=19.5 Explain why the distribution for these 106 students cannot be symmetric and given this, what % of 106 students fall within the x+/-2s? I understand it cannot be symmetric b/c the ...
*Friday, September 13, 2013 at 12:24am*

**statistics**

First graders who misbehave in school may be more likely to be regular smokers as young adults according to a new study presented in the July 2004 issue of the American Journal of Epidemiology. After following a group of U.S. first graders for 15 years, it was found that among...
*Thursday, September 12, 2013 at 6:51pm*

**statistics**

z>30 t<30 z>30
*Thursday, September 12, 2013 at 12:48pm*

**Statistics**

help
*Wednesday, September 11, 2013 at 5:38am*

**Statistics**

0.334
*Wednesday, September 11, 2013 at 12:10am*

**statistics**

9,873.35
*Tuesday, September 10, 2013 at 11:13pm*

**Statistics**

89
*Tuesday, September 10, 2013 at 7:05pm*

**Statistics**

Emissions of sulfur dioxide by industry set off chemical changes in the atmosphere that result in "acid rain." The acidity of liquids is measured by pH on a scale of 0 to 14. Distilled water has pH 7.0, and lower pH values indicate acidity. Normal rain is somewhat ...
*Tuesday, September 10, 2013 at 6:55pm*

**MATH**

Z score is the raw score in terms of standard deviations from the mean. The Z score cuts off the same proportion for any normal distribution. Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" ...
*Tuesday, September 10, 2013 at 5:37pm*

**MATH**

A person scores 81 on a test of verbal ability and 6.4 on a test of quantitative ability. For the verbal ability test, the mean for people in general is 50 and the standard deviation is 20. For the quantitative ability, the mean for people in general is 0 and the standard ...
*Monday, September 9, 2013 at 5:29pm*

**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, September 9, 2013 at 2:21pm*

**statistics**

"suppose that IQ scores have a bell-shaped distribution with a mean of 97 and standard deviation of 17.Using empirical rule, what percentage of IQ score are less than 46?"
*Sunday, September 8, 2013 at 11:59pm*

**Statistics**

The owner of the Finer Diner submitted a proposal to you in hopes of selling the business to you. His asking price is $250,000. Your financial institution advises that your monthly payment to finance that amount would be $1850.00. This is in addition to other business expenses...
*Sunday, September 8, 2013 at 7:27pm*

**statistics**

the life spans of three randomly selected tires are 31,400 miles, 40,600 miles and 36,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.
*Sunday, September 8, 2013 at 4:58pm*

**Statistics / Business**

According to the National Humane Society, "Stray Cost" or the cost of the care and feeding for a stray dog is $419.00 per year. This amount does not include veterinarian care, but only food, water and shelter. It was found that the standard deviation of this "...
*Sunday, September 8, 2013 at 2:27pm*

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