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April 23, 2014

April 23, 2014

**Recent Homework Questions About Statistics**

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**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*

**statistics**

With "or", it is unclear whether you want the probability between the scores, above them or below them. Assuming that you want the probability between the Z scores, find table in the back of your statistics text labeled something like "areas under normal ...
*Sunday, September 8, 2013 at 2:06pm*

**statistics**

P(z < -1.5 or z > 2.50) =
*Saturday, September 7, 2013 at 3:39pm*

**STATISTICS**

I state at the first row... True or false?
*Friday, September 6, 2013 at 5:12pm*

**statistics (?)**

Data missing. What is your question?
*Friday, September 6, 2013 at 1:32pm*

**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 between the two Z scores.
*Friday, September 6, 2013 at 1:28pm*

**STATISTICS**

Correlation does not necessarily indicate causation.
*Friday, September 6, 2013 at 1:23pm*

**STATISTICS (?)**

What is your question?
*Friday, September 6, 2013 at 1:20pm*

**STATISTICS**

Researchers asked questions in 1001 randomly selected adults in Russia. We found a statistically significant, strong positive correlation between income and the number of recycling bins filled their houses per week (r = 0,77). Choose the best interpretation of the result. &...
*Friday, September 6, 2013 at 6:19am*

**STATISTICS**

True or False? A researcher is interested in studying whether there is a correlation of IQ with health. For this purpose he selected a sample of 261 people and asked them to complete two questionnaires: one for IQ and one for health. After evaluating the questionnaires each ...
*Friday, September 6, 2013 at 6:15am*

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

Are there tables comparing and contrasting the following or how would you write these up? 1. Ecological Studies and Cross-Sectional Studies 2. Case control studies and Cohort studies 3. Measurement bias (aka information bias) and selection bias 4. Nondifferential ...
*Friday, September 6, 2013 at 4:46am*

**Statistics**

The average life of Canadian women is 73.75 years and the standard deviation of the women's life expectancy in Canada is 6.5 years. Using the Chebyshev's theorem, determine the minimum percentage of women in Canada whose life expectancy is between 64 and 83.5 years.
*Friday, September 6, 2013 at 12:39am*

**statistics**

A car dealer is using the number of years customers have owned their vehicles to predict how long it will be before they elect to replace them. The correlation between the two is rxy = -.723 (the longer they have owned their present vehicles, the more quickly they are expected...
*Thursday, September 5, 2013 at 5:23pm*

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

Here is the question: If gene frequencies are in equilibrium, the genotypes, AA, Aa, and aa occur in a population with frequencies (1-0)^2, 20 (1-0), and 0^2. Plato et al.published the following data on haptoglobin type in a sample of 190 people: Hp1-1 = 10 Hp1-2 = 68 Hp2-2 = ...
*Wednesday, September 4, 2013 at 8:56pm*

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

The following table gives the number of deaths due to accidental falls for each month during 1970. Is there any evidence for a departure from uniformity in the rate over time? That is, is there a seasonal pattern to this death rate? If so, describe its pattern and speculate as...
*Wednesday, September 4, 2013 at 8:48pm*

**Statistics**

It can only be stated in probability terms. 68% = within one SD 95% = within 2 SD
*Tuesday, September 3, 2013 at 3:47pm*

**Statistics**

A population has µ=100 and õ=20. If you select a single score from this population, on the average, how close would it be to the population mean? Explain your answer
*Monday, September 2, 2013 at 10:11pm*

**Statistics**

You are welcome.
*Sunday, September 1, 2013 at 1:58pm*

**statistics**

Z = (score-mean)/SEm SEm = SD/√n 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.
*Sunday, September 1, 2013 at 1:55pm*

**statistics**

7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
*Sunday, September 1, 2013 at 12:25am*

**Statistics**

Besides, movie theaters make the most profit from selling food.
*Saturday, August 31, 2013 at 1:02pm*

**Statistics**

Your reasoning is good. :-)
*Saturday, August 31, 2013 at 1:01pm*

**Statistics**

tickets for movies are usually one price right? im thinking the tickets are more beneficial bc you don't know what the person wants to eat and how much of it. this is an extra credit question
*Saturday, August 31, 2013 at 12:56pm*

**Statistics**

Yikes! That depends upon what you and your friend eat! It also depends upon the cost of the movie. Where did you get such a crazy question?
*Saturday, August 31, 2013 at 12:52pm*

**Statistics**

Going to the movies tonight with one friend. Is it more beneficial for me to pay for the tickets or food? Please explain your reasoning
*Saturday, August 31, 2013 at 12:51pm*

**Statistics**

1. A pie chart can not be used for a frequency distribution with overlapping classes. A) True B) False True?
*Friday, August 30, 2013 at 3:55pm*

**Statistics**

correlation coefficient is not related to p value. You cannot draw conclusions using the correlation coefficient.. I changed my mind... The answer is True.. If it was o.30 or bigger it would be false..
*Friday, August 30, 2013 at 2:26pm*

**STATISTICS**

Thank you!!
*Friday, August 30, 2013 at 2:21pm*

**Statistics**

Thank you!!
*Friday, August 30, 2013 at 2:21pm*

**Statistics**

Right.
*Friday, August 30, 2013 at 2:19pm*

**STATISTICS**

Whichever correlation is closest to ±1 is right. That is choice D.
*Friday, August 30, 2013 at 2:18pm*

**Statistics**

First one is B. I would agree with the second too, if P<.05.
*Friday, August 30, 2013 at 2:17pm*

**STATS**

A researcher conducted a survey on a sample of 2000 college-students in order to examine the relationship between academic achievement and procrastination of studying. Using several indicators and plots of the descriptive statistics, found that in the data were many outlier ...
*Friday, August 30, 2013 at 9:34am*

**Statistics**

A researcher wants to study the effect of gender on mathematical ability of lyceum children. From the data gathered tried to construct a scatter diagram. He did not succeed to make it though. Why? a. Had not collected enough data. b. He did not know how to construct it...
*Friday, August 30, 2013 at 7:29am*

**Statistics**

The last one is false right? there is a correlation (weak).
*Friday, August 30, 2013 at 7:25am*

**Statistics**

After making an investigation, during which the relationship between intelligence and academic achievement, calculated the correlation coefficient between the two variables, which was found to be 0.29. The researchers concluded that there is no correlation between the two ...
*Friday, August 30, 2013 at 7:24am*

**STATISTICS**

Which of the following correlation coefficients is higher? a. -0.68 b. 0.60 c. 0.68 d. a and c e. None of the above a and c right?
*Friday, August 30, 2013 at 7:19am*

**Statistics**

The scatter diagram shows: a. The frequency with which each value occurs in the data. b The values of a variable designed in comparison with the values of a second variable. c. The mean data sets. d. The percentage of data belonging to different ...
*Friday, August 30, 2013 at 7:19am*

**accounting statistics**

Find the balance at the end of 6 years of $5000 investment in an account with a nominal annual rate of interest of 2.5% compounded quarterly over the first two years and then grows according to nominal annual rate of discount of 6% convertible monthly over the remaining 4 ...
*Thursday, August 29, 2013 at 7:04pm*

**Statistics**

1. Definitely NOT II. 2. How did they know that the students started with the "same levels of mathematical achievement"? Was Britain's National School-Leaving Exam given previously? 3. Right.
*Thursday, August 29, 2013 at 3:15pm*

**Statistics/Math**

156
*Thursday, August 29, 2013 at 8:13am*

**Statistics Ms. Sue**

Here's your original post: linear correlation between the number of years in college versus average pay. average pay= 1,000 + 15,000x where x is the number of years in college. What would your average pay be if you were in college 2 years based on the model? 1,000 + (15,...
*Wednesday, August 28, 2013 at 7:27pm*

**Statistics Ms. Sue**

Thank you Ms. Sue for the answer. I just wanted to know how you arrived at that $31000, because I have a number of problems like that one. Thank you. Mary
*Wednesday, August 28, 2013 at 7:22pm*

**Statistics**

What didn't you understand about my previous answer? http://www.jiskha.com/display.cgi?id=1377723981
*Wednesday, August 28, 2013 at 7:00pm*

**Statistics**

linear correlation between the number of years in college versus average pay. average pay= 1,000 + 15,000x where x is the number of years in college. What would your average pay be if you were in college 2 years based on the model?
*Wednesday, August 28, 2013 at 6:52pm*

**Statistics**

A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the students had ...
*Wednesday, August 28, 2013 at 6:08pm*

**Statistics**

$31,000
*Wednesday, August 28, 2013 at 5:24pm*

**Statistics**

linear correlation between the number of years in college versus average pay. average pay= 1,000 + 15,000x where x is the number of years in college. What would your average pay be if you were in college 2 years based on the model?
*Wednesday, August 28, 2013 at 5:06pm*

**STATISTICS**

Are the student final exam scores in classroom A significantly different than the average of classroom B, 80%? Provide the Independent Variable, Dependent Variable, and best method of analysis.
*Wednesday, August 28, 2013 at 12:15am*

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