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April 18, 2014

April 18, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**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*

**Statistics**

1. correct 2. Wrong. Look up definitions of 'sample" and "Census". 3. Wrong. Look up sampling error. 4. Wrong. Look up statistic and parameter. 5. Wrong. Look up statistic and parameter. 6. Right. 7. Right. 8. Right. 9. Right. 10. Right. 11. Right. 12. Wrong...
*Tuesday, August 27, 2013 at 2:52pm*

**Statistics**

2.376
*Monday, August 26, 2013 at 7:45pm*

**Statistics**

2.376
*Monday, August 26, 2013 at 7:44pm*

**Statistics**

I am respectfully requesting help with the following assignment. I am struggling in this chapter of statistics... Define the term sample? A) A sample is a numeric characteristic of a sample B) A sample is a numeric characteristic of a population C) A sample is the entire ...
*Monday, August 26, 2013 at 2:08pm*

**Statistics**

16. 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 to the Z score. 17. Use same equation and table. 18. Use table to find P = ± ,45 to ...
*Monday, August 26, 2013 at 1:31pm*

**statistics (incomplete)**

1. You answered this in your second question. There is no data to help in making a decision.
*Monday, August 26, 2013 at 1:16pm*

**ju department of statistics**

blood measureseveral weeks av.182 with sandard daviation 12.6 another petiont av.124 standad daviation 9.4 which petionts blood more variable
*Monday, August 26, 2013 at 5:36am*

**statistics**

1.What’s the most appropriate procedure for evaluating the relationship between tenure and divorce? 2.What is the correlation and how can it be interpreted in terms of magnitude, direction and practical importance? 3.How much of whether executives have been divorced can ...
*Sunday, August 25, 2013 at 11:47pm*

**Intro to Healthcare Statistics**

What is YOUR question? The instructions seem very clear and detailed.
*Sunday, August 25, 2013 at 7:56pm*

**Intro to Healthcare Statistics**

Discuss how statistics are generated and how statistical information is used by healthcare organizations. Explore the NC State Center for Health Statistics at the following website and discuss at least two types of statistic health information that NC collects.
*Sunday, August 25, 2013 at 7:29pm*

**Statistics**

4) The P-value of the appropriate test is about ________%.
*Sunday, August 25, 2013 at 8:48am*

**Statistics**

A statistician believes that in her town each child born has a 50% chance of being a girl, independently of all other children. There are 281 three-child families in her town; 39 of these families have no girls, 94 have one girl, 115 have two girls, and the remaining 33 have ...
*Sunday, August 25, 2013 at 8:45am*

**statistics**

Use the following scenario to answer the next 5 questions. Millions of Americans are subjected to drug testing in the workplace. The tests are not always reliable. A false positive rate of 5% is considered to be a conservative estimate. Suppose that there are 20 employees in ...
*Saturday, August 24, 2013 at 7:10pm*

**Statistics**

The next three questions refer to the following situation. Data from previous years reveal that the distribution if first exam scores in an introductory statistics class is approximately normal with a mean of 72 and a standard deviation of 12. 16) Given that the passing score ...
*Saturday, August 24, 2013 at 6:47pm*

**Statistics**

problem 1: The treatment does something Problem 2: False
*Saturday, August 24, 2013 at 10:03am*

**Statistics**

A statistician analyzing a randomized controlled experiment has tested Null: The treatment does nothing. Alternative: The treatment does something. using a 4% cutoff for P-values. The P-value of the test turns out to be about 1.8%. 1. The conclusion of the test is -The ...
*Saturday, August 24, 2013 at 6:08am*

**statistics**

Researchers conducted a survey of parents of 66 kindergarten children. The parents were asked whether they played games with their children. The parents were divided into two groups: working class and middle class. The researchers wanted to know if there was an association ...
*Friday, August 23, 2013 at 9:08pm*

**Statistics**

thanks . for other question answer is click both the options
*Friday, August 23, 2013 at 11:21am*

**Statistics**

thanks
*Friday, August 23, 2013 at 11:19am*

**Statistics**

Problem 3, under null is 25 number of plants in Category D.
*Friday, August 23, 2013 at 7:07am*

**Statistics**

It’s been a long road through Stat 2X. Please click on BOTH the options below for a score of 2 points. a)She gave us a couple of free points in each of the previous two courses. b)She’s not going to forget the freebies this time Please, help me.
*Thursday, August 22, 2013 at 11:35pm*

**Statistics**

0.2775
*Thursday, August 22, 2013 at 9:27pm*

**Statistics**

Problem 5 Degrees of freedom = _______.
*Thursday, August 22, 2013 at 5:27pm*

**Statistics**

1. 79/grand total = ? 2. df for what?
*Thursday, August 22, 2013 at 1:28pm*

**Statistics**

If the two variables were independent, the chance that a sampled car is a domestic gasoline fueled car would be estimated to be about 0.0362 0.0499 0.2775 0.3820 0.5
*Thursday, August 22, 2013 at 12:14pm*

**Statistics**

what's the answer? Under the null, the expected number of plants in Category D is ______.
*Thursday, August 22, 2013 at 11:38am*

**Statistics**

75.3033 is the answer
*Wednesday, August 21, 2013 at 8:26pm*

**Statistics**

A simple random sample of cars in a city was categorized according to fuel type and place of manufacture. domestic foreign gasoline 146 191 diesel 18 26 gasoline/ 51 79 electricity hybrid 1. If the two variables were independent, the expected number of foreign gas/electric ...
*Wednesday, August 21, 2013 at 4:22pm*

**Statistics**

According to a genetics model, plants of a particular species occur in the categories A, B, C, and D, in the ratio 9:3:3:1. The categories of different plants are mutually independent. At a lab that grows these plants, 218 are in Category A, 69 in Category B, 84 in Category C...
*Wednesday, August 21, 2013 at 4:16pm*

**Statistics**

According to DeVeaux/Velleman, the best way to succeed in the study of statistics is to memorize definitions and learn equations? True or False I chose True
*Wednesday, August 21, 2013 at 4:09pm*

**Statistics**

I agree. http://www.oswego.edu/~srp/stats/variable_types.htm
*Wednesday, August 21, 2013 at 4:00pm*

**Statistics**

Is GPA a quantitative or categorical variable? I think it is quantitative because it consists of numbers...
*Wednesday, August 21, 2013 at 3:54pm*

**Statistics**

prob 1 - the model is good
*Wednesday, August 21, 2013 at 1:51pm*

**Biology (Science)**

Are you just guessing? 1. What peers are mentioned? Not frogs. Data 2. Observation 3. "statics" or statistics? Although "Analysis" is not listed in your word bank, it applies here. 4. What are other scientists considered to be? 5. This is the only one you ...
*Wednesday, August 21, 2013 at 1:49pm*

**Statistics**

what's the answer? Under the null, the expected number of plants in Category D is ______.
*Wednesday, August 21, 2013 at 9:52am*

**Statistics**

and what's the answer ? If the two variables were independent, the expected number of foreign gas/electric hybrids would be estimated to be _______. (Please keep at least two decimal places)
*Wednesday, August 21, 2013 at 9:51am*

**Statistics**

what's the answer? If the two variables were independent, the chance that a sampled car is a domestic gasoline fueled car would be estimated to be about 0.0362 0.0499 0.2775 0.3820 0.5
*Wednesday, August 21, 2013 at 9:50am*

**Statistics**

@walter de u link doesn't work
*Wednesday, August 21, 2013 at 2:30am*

**Statistics**

Thanks, Walter DE
*Tuesday, August 20, 2013 at 12:08am*

**statistics**

0.9066
*Monday, August 19, 2013 at 6:34pm*

**Statistics**

Exercise set 5 answers: 4c51a450.linkbucks Note: add dotcom after the word linkbucks you're welcome
*Sunday, August 18, 2013 at 4:58pm*

**Statistics**

Exercise set 5 answers: 4c51a450.linkbucks Note: add dotcom after the word linkbucks you're welcome
*Sunday, August 18, 2013 at 4:56pm*

**Statistics**

Problem 3?
*Sunday, August 18, 2013 at 3:56pm*

**Stats**

Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√n If only one SD is provided, you can use just that to determine SEdiff. Find table in the back of your statistics text labeled something like "...
*Sunday, August 18, 2013 at 3:04pm*

**statistics**

The P-value of the test is
*Saturday, August 17, 2013 at 6:32pm*

**Statistics**

how do you do p8?
*Saturday, August 17, 2013 at 5:40pm*

**Statistics**

how do u do question 2 whats the method
*Saturday, August 17, 2013 at 4:36pm*

**Statistics**

I believe it is!!!!!
*Saturday, August 17, 2013 at 4:06pm*

**Statistics**

So, is 75.3033 ok for Foreign and Hybrid??
*Saturday, August 17, 2013 at 3:08pm*

**Statistics**

The chi-square statistic is 0.6716. The test therefore concludes that the two variables are independent Degrees of freedom = 2
*Saturday, August 17, 2013 at 1:47pm*

**Statistics**

I get 75. something for foreign and hybrid.. is that right?? And ok for NULL, meaning INDEPENDENT.. Can you help me with this?
*Saturday, August 17, 2013 at 12:59pm*

**Statistics**

Ok.. so I have done this.. And I´ve got the first questions right.. Made a fool of myself with the degrees of freedom, but now I know better... For the question of foreign/hybrid I got 195.209392 for my first try and got it wrong... I messed up the columns.. I need to ...
*Saturday, August 17, 2013 at 12:56pm*

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