Saturday

September 20, 2014

September 20, 2014

Number of results: 9,346

**statistics**

Complete the hypothesis test: null hypothesis = 52, alternative hypothesis =<52, a=0.01 usin data set 45,47,46,58,59,49,46,54,53,52,47,41
*July 19, 2010 by Shelly*

**Statistics**

If my p-value = .322 and my significant level is .05 , then My Null Hypothesis is rejected and I must accept the Alternative hypothesis My Null Hypothesis is not rejected My Alternative hypothesis becomes the new Null Hypothesis I cannot make a decision until I know my sample ...
*June 15, 2010 by John*

**Statistics**

are the following statements, Ho:=10 and Ha:equal to or less than, a valid pair of null and alternative hypothesis?assume that in a hypothesis test with null hypothesis Ho : u = 12.0 at a = 0.10, that a value of 16.0 for the sample mean results in the null hypothesis being ...
*November 19, 2011 by Cynthia*

**Statistics**

Does the null hypothesis for a nondirectional alternative hypothesis differ from the null hypothesis for a directional alternative hypothesis? Explain. I have no idea how to state the answer for this.
*May 24, 2008 by Christine*

**Statistics**

What are the steps espoused by Applied Statistics in Business and Economics for formal hypothesis testing? Explain why the sequence is important. What might happen if the hypothesis test is performed before the researcher has decided on the significance level?
*November 2, 2010 by Kathy*

**statistics**

Use the given information to find the P-value. Also, use a 0.05 significance level and state the conclusion about the null hypothesis (reject the null hypothesis or fail to reject the null hypothesis). 1) Vvith H1: p * 0.733, the test statistic is z = 2.09. A) 0.0183; fail to ...
*April 21, 2010 by Marc*

**STAT**

Given a sample size of 18, with sample mean 660.3 and sample standard deviation 95.9, we are to perform the following hypothesis testing: Null Hypothesis H0 : = 700 Research Hypothesis H1 : ≠ 700 What is the test statistics? At a 0.05 significance level, what is ...
*October 12, 2013 by Jacky*

**STAT**

Given a sample size of 18, with sample mean 660.3 and sample standard deviation 95.9, we are to perform the following hypothesis testing: Null Hypothesis H0 : = 700 Research Hypothesis H1 : ≠ 700 What is the test statistics? At a 0.05 significance level, what is ...
*October 13, 2013 by Jacky*

**statistics**

Formulate a hypothesis statement and perform the five-step hypothesis testing procedure
*August 8, 2010 by sue*

**Statistics**

Which testing a statistical hypothesis with significance level of alpha 0.05, when do you reject the NULL hypothesis (HO)?
*September 15, 2010 by Beata Chmielewska*

**Statistics**

The null hypothesis is: a. Always contains a > in the equation b. Not needed c. The alternative hypothesis d. The hypothesis of no difference e. Always contain a < in the equation
*September 15, 2010 by Beata Chmielewska*

**STATS**

Given a sample size of 18, with sample mean 660.3 and sample standard deviation 95.9 we are to perform the following hypothesis test. Null Hypothesis H0: = 700 Alternative Hypothesis H0: 700 At significance level 0.05 1. What is the critical value for this test? ...
*March 30, 2010 by Mary*

**Statistics**

True or False In most research situations, the goal of a hypothesis test is to reject the null hypothesis.
*December 20, 2013 by lyn*

**Hypothesis Statistics**

A two-tailed test is conducted at the 5% significance level. What is the P-value required to reject the null hypothesis?
*September 9, 2012 by Courtney*

**Statistics **

A statistical test is performed, and its P-value turns out to be about 3%. Which of the following must be true? Pick all that are correct. The null hypothesis is true. There is about a 3% chance that the null hypothesis is true. The alternative hypothesis is true. There is ...
*August 4, 2013 by Audrey*

**statistics**

The proportion of adults in the US with basic literary skills is 43%. If a hypothesis test is performed on this, how should you (in terms of the claim) interpret a decision that rejects the null hypothesis?
*June 13, 2012 by linds*

**statistics**

Given a sample size of 38, with sample mean 660.3 and sample standard deviation 95.9 we are to perform the following hypothesis test. Null Hypothesis H0: = 700 Alternative Hypothesis H0: 700 At significance level 0.05 3. Calculate the test statistics (Tip: this is the...
*August 9, 2010 by Scott*

**Statistics**

Cholesterol levels of adult males are approximately normally distributed with a mean of mg/dL and a listed variance of . Some researchers claim that the variance of cholesterol levels of adult males is less than . Suppose that we want to carry out a hypothesis test to see if ...
*April 29, 2011 by Michelle*

**stats**

A statistics practitioner wishes to test the following hypothesis: H0 : = 600 against H1 : < 600 A sample of 50 observations yielded the statistics: mean x = 585 and standard deviation sx = 45. The test statistic of a test to determine whether there is enough evidence ...
*March 31, 2010 by joseph*

**Statistics**

in a hypothesis test conducted at a level of significance of 2%a p-value of 0.01280 was obtained the best interpation of the hypothesis test is
*December 12, 2011 by ron*

**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?
*February 9, 2014 by Tiffany*

**statistics**

In a chi-squared test of a contingency table, the value of the test statistic was =12.678, and the critical value at = 0.025 was 14.4494. Thus, (Points: 2) A) we fail to reject the null hypothesis at = 0.025 B) we reject the null hypothesis at = 0.025 C) we dont have enough ...
*August 18, 2009 by Danny*

**statistics**

Which of the following statements is correct? A. An extremely small p-value indicates that the actual data differs markedly from that expected if the null hypothesis were true. B. A large p-value indicates that the data is consistent with the alternative hypothesis. C. The p-...
*April 25, 2014 by scott*

**Statistics**

Please Help I'm desperate! Complete the hypothesis test with alternative hypothesis d < 0 based on the paired data that follow and d = M - N. Use = 0.02. Assume normality. M 48 47 67 79 73 66 N 52 55 68 87 78 70 (a) Find t. (Give your answer correct to two decimal places...
*October 28, 2013 by Casey *

**statistics**

he mean height of a certain kind of plant is 190 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 190 . State the null hypothesis and the alternative hypothesis that we ...
*March 6, 2012 by ronald*

**statistics**

Question Details The following data was collected to determine whether or not Monroe County College students work 18 hours per week: 20,22,25,12,30,49,10,30,17,15,0,24,20,22,23,20,25,24,30,12,15,29,0,25,2,40,30,0,33,0,45,30,38,48,0,40,20,0,0,24. a) Describe the population b) ...
*March 8, 2012 by Lajuanda*

**statistics**

if the null hypothesis is that the mean is 3218, the alternative hypothesis is that the mean > 3228, and the sample mean is x= 3342, the sample standard deviation is s=287, the sample size is n= 42, and α= 0.01 a. calculate the z test statistic. b. what is the p-value...
*April 29, 2012 by emily*

**statistics**

A researcher has collected statistics pretest scores for students representing 3 different age groups 18-30 31-45 45 and up 3 5 10 7 10 2 9 9 8 6 8 8 4 6 5 Do hypothesis test using ANOVA to find if significant difference. Use alpha .05. All hypothesis steps adn find degrees of...
*December 13, 2011 by Malia*

**Statistics**

Which of the following is an accurate definition of a Type II error? a. rejecting a false null hypothesis b. rejecting a true null hypothesis c. failing to reject a false null hypothesis d. failing to reject a true null hypothesis
*December 20, 2013 by Lyndyc*

**statistics**

In performing a hypothesis test, the null hypothesis is population mean = 6.9 and the alternative hypothesis is population mean ≠ 6.9, a random sample of 16 items is selected. The sample mean is 7.1 and the sample standard deviation is 2.0. The population is ...
*August 17, 2014 by Anonymous*

**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 for 40,...
*February 10, 2014 by Jen*

**Statistics **

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.
*July 11, 2013 by Rey*

**statistics**

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.
*March 5, 2014 by Anonymous*

**statistics**

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.
*March 5, 2014 by Anonymous*

**Statistics**

Using the numerical data for your team project, conduct a two sample, two-tailed hypothesis test for the mean, with a 0.05 level of significance. Find and interpret each step. H0: H1: Test statistic = Critical value = p-value = Reject the null hypothesis or do not reject the ...
*July 8, 2012 by Anita*

**Earth Science**

A scientific hypothesis can become a theory if? a- the entire scientific community accepts it b- the hypothesis is tested extensively and competing hypothesis are eliminated c- there are no other competing hypothesis d- the hypothesis can be tested at least once My answer is B
*August 13, 2014 by Cole*

**Statistics**

In an analysis of variance, if the null hypothesis is true then: - The research hypothesis is also true -You will need fewer participants for the experiment - There is less variance among the sample means than if the null hypothesis was not true - The within-group estimate of ...
*October 11, 2009 by Trey*

**Statistics**

The null hypothesis,H0:u=48,was tested against the alternative hypothesis,H1:u>48.A sample of 75 resulted in a calculated p-value of 0.102.if standard deviation=3.5,the value of the sample mean is?need help
*March 23, 2011 by Joel*

**statistics**

The researcher wanted to test the hypothesis that Ho: μ=3, knowing the population, which was normal, had a variance of 1.00. -- How powerful would this test be against the alternative hypothesis that Ha: μ=4, given that n=15, α = .05
*June 4, 2008 by Lezlie*

**statistics**

How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in courts, in medicine, or ...
*February 14, 2012 by Jay*

**Statistics**

How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in courts, in medicine, or ...
*June 12, 2012 by Anonymous*

**Statistics**

How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in courts, in medicine, or ...
*December 12, 2013 by Tangy*

**statistics**

If the null hypothesis for the example survey posted is "There is no correlation between level of drug use and satisfaction with one's personal life." What are the three possible alternative hypotheses that could be stated, using only the variables and statistical test ...
*July 18, 2012 by Trip*

**statistics**

Briefly explain how increasing sample size influences each of the following. Assume that all other factors are held constant. a. The size of the z- score in a hypothesis test. b. The size of Cohens d. c. The power of a hypothesis test.
*March 18, 2011 by Melissa Williams*

**statistics**

Needing some help to clarify this problem and help finding the right answer. _b___ 2. Which of the following accurately describes the critical region? a. outcomes with a very low probability if the null hypothesis is true b. outcomes with a high probability if the null ...
*December 29, 2013 by Lyn*

**statistics for behavioral sciences**

In a one- to two-page Microsoft Word document, for each hypothesis listed indicate: Whether the appropriate analysis would be a one-tailed test or a two-tailed test. A type I and type II error, given the context of the hypothesis. Hypothesis: The three treatments tested differ...
*February 21, 2012 by troy*

**statistics for behavioral sciences**

In a one- to two-page Microsoft Word document, for each hypothesis listed indicate: Whether the appropriate analysis would be a one-tailed test or a two-tailed test. A type I and type II error, given the context of the hypothesis. Hypothesis: The three treatments tested differ...
*February 21, 2012 by troy*

**PHI 103**

Kari Popper advocates, as a more efficient way to examine a scientific hypothesis, which of the following? A) Gather as much data as possible supporting the hypothesis. B) Fake the data C) Try to show the hypothesis is false. D) Meditate on what the hypothesis really means. ...
*May 15, 2012 by shelley*

**math**

A researcher is performing a hypothesis test. The null hypothesis is that μ=10 and the alternative hypothesis is that μ<10. A sample of 18 individuals was collected and the t-based test statistic calculated from the data was -2.105. What is the approximate p-value...
*April 9, 2014 by jerrod*

**Statistics**

A song must be n longer than 3 minutes and 30 seconds, or (210 seconds) Micheal Jackson founds out that his mean song length is 244.6 seconds with a standard deviation of 29/3 seconds. What is the null hypothesis and the alternative hypothesis, what is the right formula and ...
*April 28, 2014 by Nicole*

**Statistics**

A song must be n longer than 3 minutes and 30 seconds, or (210 seconds) Micheal Jackson founds out that his mean song length is 244.6 seconds with a standard deviation of 29/3 seconds. What is the null hypothesis and the alternative hypothesis, what is the right formula and ...
*April 28, 2014 by Nicole*

**statistics**

An analysis of variance is used to evaluate the mean differences for a research study comparing three treatments with a separate sample of n = 6 in each treatment. If the data produce an F-ratio of F = 4.10, then which of the following is the correct statistical decision? a. ...
*November 14, 2012 by Robbie*

**Statistics**

Need help with these questions: I have already answered 27 out of the 30 accept these last three: 8. Given the significance level 0.01, the F-value for the degrees of freedom, d.f. = (7,3) is. A) 8.45 B) 27.67 C) 5.89 D) 14.62 9. One-way ANOVA is performed on three independent...
*March 8, 2009 by Stuart*

**statistics**

What is the alternative hypothesis for a null hypothesis stating that the average time a person keeps a cell phone is at most three years. Answer: Ha: mu > 3 State the null and alternative hypotheses for the following: You are investigating a complaint that "special ...
*January 26, 2012 by Anonymous*

**probability and statistics I NEED HELP**

A six-sided die is rolled 20 times and a 5 is rolled 9 times. a) State a null and alternative hypothesis for the die being fair. b) Can the null hypothesis be rejected at the .01 significance level?
*May 31, 2011 by Julie*

**Psychological Statistics**

A researcher predicts that watching a film on institutionalization will change students attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them a questionnaire about their attitudes. The ...
*February 6, 2012 by Patience*

**Psychological Statistics**

A researcher predicts that watching a film on institutionalization will change students attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them a questionnaire about their attitudes. The ...
*February 20, 2012 by Patience*

**Psychological Statistics**

A researcher predicts that watching a film on institutionalization will change students attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them a questionnaire about their attitudes. The ...
*March 1, 2012 by Patience*

**statistics**

The owner of a bottling company is considering buying a new bottling machine. He has been testing two different machines that are being considered. After collecting 300 samples from each machine over several weeks, he was able to conduct a two sample z test.<p>He decided...
*January 8, 2011 by Anonymous*

**Statistics**

The claim that "38% of those persons who retired from an industrial job before the age of 60 would return to work if a suitable job was available," is to be investigated at the 0.02 level of risk. If 86 out of the 200 workers sampled said they would return to work, what is ...
*April 27, 2014 by Ryan*

**Bio**

1. A control group differs from an experimental group: A. in the number of test organisms used. B. by the independent variable. C. in several ways. D. in no way. is it A 2. A theory and a hypothesis are different in that: A. you must have a theory before you can form a ...
*July 10, 2013 by Amy*

**statistics**

for a hypothesis comparing two population means, what is the critical value for a one-tailed hypothesis test, using a 5percent level of significance level, with both sample sizes equal to 13? the standard deviations for the samples are 5 and 7. assume the population standard ...
*April 28, 2014 by marsha*

**statistics**

In hypothesis testing, why are verbal problem statements converted to numerical problem statements? Why is it important to identify the parameter when converting a problem statement from verbal to numerical? Why do a null and alternative hypothesis have to be mutually exclusive?
*March 11, 2010 by pebbles*

**statistics**

Cholesterol levels of adult males are approximately normally distributed with a mean of mg/dL and a listed standard deviation of . Some researchers claim that the standard deviation of cholesterol levels of adult males is less than . Suppose that we want to carry out a ...
*February 27, 2010 by anaya*

**Statistics**

What does it mean when a researcher chooses the cutoff in a comparison distribution to be .01? a. It means that to reject the null hypothesis, the result must be higher than a z score of .01 b. It means that to reject the null hypothesis there must be less than a 1% chance ...
*June 10, 2010 by Angela *

**Science (Hypothesis)**

The null hypothesis is the hypothesis of no difference, while the hypothesis is what you expect to occur, right? So, what if what you expect to occur is the null? Can you do this? For example, Null: Mice prefer areas along the wall and areas along the edges equally. Hypothesis...
*September 20, 2011 by Jackie*

**Statistics**

Using a 0.05 level of significance, test the hypothesis that the probability of the NCAA Division I basketball champion being from the Pac 10 is 20%. Repeat the test for the hypothesis that the probability the champion is UCLA is 20%. What do these results say about testing ...
*November 7, 2013 by Maria*

**statistics**

Composite ACT Scores Non-Athletes Athletes 25 21 22 22 27 21 19 29 24 25 26 27 24 30 19 25 27 23 24 26 17 23 23 a. Test an appropriate hypothesis and state your conclusion. Use alpha = .05 for your test. Show the null and alternative hypothesis, the p-value, your conclusion to...
*November 28, 2011 by jabrony*

**ap statistics**

Which of the following is not correct? A. The rejection region is controlled by the alpha level and the alternate hypothesis. B. The p-value measures the probability that the null hypothesis is true. C. The probability of a Type I error is controlled by the selection of the ...
*April 24, 2014 by cassandra*

**statistics**

Cholesterol levels of adult males are approximately normally distributed with a mean of mg/dL and a listed standard deviation of . Some researchers claim that the standard deviation of cholesterol levels of adult males is less than . Suppose that we want to carry out a ...
*February 27, 2010 by anaya*

**psychology statistics**

15. Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the ...
*January 14, 2012 by Anonymous*

**statistics**

Perform a two-tailed hypothesis test on the intrinsic variable AND a two-tailed hypothesis test on the extrinsic variable's data using a .05 significance level. Begin by creating a null and an alternate statement. Use Microsoft Excel to process your data. Copy and paste the ...
*May 13, 2010 by Donaldson*

**Statistics**

How do you tell if the null hypothesis rejects or fails?
*November 17, 2007 by LT*

**statistics**

I need help with p for a hypothesis test for normal distribution.
*October 20, 2012 by carolyn*

**Statistics**

We conducted a hypothesis test for a population parameter at alpha = 0.05 and we failed to rejected Ho. If we decided to use alpha = 0.10, how would our conclusion change? A) At alpha = 0.10, we would still fail to reject HO. B) At alpha = 0.10, we would reject HO. C) It is ...
*November 11, 2013 by Samantha*

**Statistics**

What if my p value is below 0.05 does it reject or fail the null hypothesis
*November 17, 2007 by LT*

**statistics**

Can someone help me to understand the purpose of null hypothesis testing?
*February 18, 2012 by Patiance*

**statistics**

Can someone help me out with project for Data Management. I need some topics that I could use for my thesis/hypothesis (with a lot of information) I had death rates as my topic but my teacher said he does not approve of it because the statistics for it is too easy because you ...
*March 3, 2011 by Joey*

**Statistics**

In a test of hypotheses, the null hypothesis is that the mean is 100 and the alternate hypothesis is that the mean is greater than 100. The power of the test when the mean is 101 would be greatest for which of the following choices of sample size n and significance level α...
*December 10, 2009 by Steve*

**statistics**

mu=78 population std deviation=12 Normal Distribution n=16 alpha level=.05 * compute the power of the hypothesis test if the program has a 3-point effect. I came up with 83.88 % * compute the power of the hypothesis test if the program has a 6-point effect. I looked at the ...
*June 3, 2008 by Jenna*

**statistics**

The data was obtained from car crash experiments. The table values are the chest deceleration data (g) for the dummy in the drivers seat. Use a 0.05 significance level to test the null hypothesis that the different weight categories have the same mean. Do the data suggest ...
*March 24, 2012 by EXHAUSTED ON MATH*

**Statistics**

Which of these statements is always true for a researcher who is using standard statistical methods in a test of significance? A. A researcher who rejects a true null hypothesis has committed a Type II error. B. A researcher who rejects the null hypothesis has computed a test ...
*March 29, 2014 by John*

**Statistics**

Given the following null hypothesis, give an example of a Type II error. Ho: There is no difference in the level of understanding of this chapter between students who have previously taken a statistics course and students who have not previously takn a stastics course.
*November 21, 2013 by Anonymous *

**Statistics**

What key words tell you that the Hypothesis is to be set up as a 1 Tail UPPER?
*February 28, 2010 by Barbara*

**Statistics**

What is the APA statement, hypothesis, and error for z score -2.50 and p value 0.006?
*May 27, 2012 by Stormy*

**statistics**

How is the P-value used to determine whether or not to reject the null hypothesis?
*June 22, 2013 by jerry*

**statistics**

Failing to reject the null hypothesis when it is false is a Type II Error. T or F, and why or why not?
*November 23, 2013 by Shar*

**statistics**

Consider an upper-tail test of hypothesis for the difference in two population means. The sample data from the first population is: n = 50, x-bar = 110, s = 10. The sample data from the second population is: n = 75, x-bar = unknown, s = 11. We conclude the alternative ...
*November 17, 2013 by zac*

**Hypothesis**

Suppose that the average grade for all people who take this course in statistics is 83 with a standard deviation of 3.5. If your particular class has an average of 89, can you conclude that your class is better than average at the 90 percent confidence level? Identify one or ...
*November 16, 2009 by Terra*

**PLEASE HELP ME!!!**

A researcher has collected statistics pretest scores for students representing 3 different age groups 18-30 31-45 45 and up 3 5 10 7 10 2 9 9 8 6 8 8 4 6 5 Do hypothesis test using ANOVA to find if significant difference. Use alpha .05. All hypothesis steps adn find degrees of...
*December 13, 2011 by jennifer*

**Stats**

A statistical test is performed, and its P-value turns out to be about 3%. Which of the following must be true? Pick all that are correct. a) The null hypothesis is true. b)There is about a 3% chance that the null hypothesis is true. c) The alternative hypothesis is true. d) ...
*August 3, 2013 by Helen*

**statistics**

Could someone work a problem like this one, for an example. Complete the hypothesis test with alternative hypothesis d < 0 based on the paired data that follow and d = M - N. Use = 0.02. Assume normality. M 49 67 45 57 57 48 N 57 68 47 60 64 55 (a) Find t. (Give your ...
*June 24, 2013 by tracy10*

**statistics**

A researcher is testing a null hypothesis that states: H: = 50. A sample of 25 scores is selected and the mean is M = 55.Assuming that the sample variance is s2 = 100, compute the estimated standard error and the t statistic. Is this sample sufficient to reject the null ...
*April 15, 2011 by kesha*

**Biology lab - hypothesis?**

For each of the observations, list a possible question, hypothesis and prediction. 1. Observation: Chicken soup seems to cure a cold. Question: Hypothesis: Prediction:
*September 22, 2008 by Ashley*

**statistics**

I have a data set for MLB teams. the assignment is to form a hypothesis based on the set. h0- Teams with higher attendance will have a better ERA h1- attendance will not effect the ERA Preform a 5 step hypothesis test and show work for z and t test. I am not sure what kind of ...
*May 8, 2010 by Luke*

**Statistics**

We conducted a hypothesis test for a population parameter at alpha = 0.01 and we failed to rejected Ho. If we decided to use alpha = 0.05, how would our conclusion change? A) At alpha = 0.05, we would still fail to reject HO. B) At alpha = 0.05, we would reject HO. C) It is ...
*November 11, 2013 by Samantha*

**Statistics**

In hypothesis testing, if a claim statement is asking to test a percentage, your graph is a T or Z line?
*October 21, 2009 by Kevin*

**statistics**

What is the correct methodology for defining null and alternative hypothesis? Give an example
*June 4, 2010 by annette*

**statistics**

The mean age of Facebook users is below 20." What is an appropriate null hypothesis?
*December 3, 2010 by Anonymous*

**statistics**

Select a sample of 20 individuals and the test the hypothesis =225 for IQ level. Use a=0.05
*February 14, 2012 by Anonymous*

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