Friday
April 18, 2014

Search: statistic

Number of results: 1,281

writing
A)The date and source of the statistic B)What population(s) the statistic represents C)The author responsible for the statistic or quotation
Thursday, May 10, 2012 at 12:21pm by Anonymous

writing
When citing statistics from a web page in your speech you need to provide which of the following: ALL The date and source of the statistic What population(s) the statistic represents The author responsible for the statistic or quotation
Thursday, May 10, 2012 at 12:21pm by Anonymous

Statistics
MathGuru, /**** statistic. Otherwise, check a z-table for a one-tailed test at .05 level of significance. Compare to your test statistic. If the test statistic exceeds the value from the table, reject the null and conclude p < .90. If the test statistic does not exceed the ...
Friday, April 20, 2012 at 7:20pm by Srinivas

College and Math Courses
Is statistic 243 equivalent to AP Statistic?
Friday, November 15, 2013 at 6:56pm by Anonymous

Psychology
ask how the statistic was calculated and what data the statistic is based upon.
Tuesday, April 23, 2013 at 4:11pm by shep

statistics
Try a one-sample t-test to determine your test statistic. Once you have the test statistic, compare the test value to the critical value from a t-table using degrees of freedom along with the significance level. If the test statistic exceeds the critical value from the table, ...
Tuesday, August 2, 2011 at 1:01pm by MathGuru

Animal Science
I need a statistic of how many dogs and cats are currently in a foster home in the us. Does anyone know a website that has this credible statistic? thanks
Wednesday, November 30, 2011 at 7:34pm by hannah

statistics
I need so help figuring out which statement is true or false. 1. A parameter always describes a larger group than a statistic. 2. The sampling distribution of a statistic is the distribution of values taken by the statistic in all possible samples of all possible sizes from ...
Thursday, February 5, 2009 at 10:44pm by Sue

statistic
You can probably use a one-sample proportional test for your data. (Test sample proportion = 20/55 or .36) Find the appropriate table for your critical value at .10 level of significance for a one-tailed test. Compare the test statistic you calculate to the critical value from...
Tuesday, August 2, 2011 at 12:40am by MathGuru

statistics
Here are a few hints: 1. Try an independent groups t-test to calculate the t-test statistic. 2. Degrees of freedom for an independent groups t-test is this: n1 + n2 - 2 3. Compare your test statistic to the critical values listed. If the test statistic exceeds the critical ...
Thursday, January 17, 2013 at 7:03pm by MathGuru

Statistics
Use the z-test formula to find the test statistic: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) Plug the values given into the formula to calculate your z-test statistic. Since the H1 shows a specific direction, this ...
Saturday, March 13, 2010 at 8:59pm by MathGuru

statistics
Use the appropriate statistical formula for this type of 2-sample test. Calculate the test statistic using the information in the problem. Find your critical value using the appropriate table at .05 level of significance for a one-tailed test. Compare your test statistic to ...
Thursday, February 16, 2012 at 8:18pm by MathGuru

statistic
will you help with my statistic class
Friday, December 13, 2013 at 9:05pm by Patricia

statistic
For a two-tailed hypothesis test, the test statistic is z = 1.42. What is the p-value?
Tuesday, October 29, 2013 at 9:17pm by Anonymous

Statistic
You can use a one-sample proportional z-test for your data. (Test sample proportion = 39/90 and sample size = 90) Convert fractions to decimals to use in the z-test. Find the critical value in the appropriate table at .05 level of significance for a two-tailed test. Compare ...
Monday, July 9, 2012 at 10:41pm by MathGuru

Statistics
To do inferential procedures comparing two proportions, we need another variance formula (our ruler). This formula is based on what principle? A) The variance of the difference of two statistics is the difference of the variances of each statistic. B) The variance of the ...
Friday, November 15, 2013 at 7:30pm by Katie

Stats
2 samples were collected to determine whether there was a difference between two weight loss methods targeting men. The average weight loss method is provided for the 2 samples along with the respective standard deviations. Is the second method - with an average weight loss of...
Friday, February 23, 2007 at 4:33pm by Jason L

statistic
how a t Test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students. Why would this t Test be preferred to using another test statistic?
Wednesday, December 15, 2010 at 12:42am by smith

statistics
The p-value is the actual level of the test statistic. It represents the probability of getting a result as extreme as the test statistic itself. To determine this probability, use a z-table with the z-values given.
Monday, September 13, 2010 at 1:41pm by MathGuru

Statistics
You can use a one-sample proportional z-test for your data. (Test sample proportion = 24/200 and sample size = 200) Convert all fractions to decimals. Find the critical value in the appropriate table at .01 level of significance for a two-tailed test. Compare the test ...
Thursday, July 19, 2012 at 10:57am by MathGuru

hypothesis statistic
how a t Test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score. Respond to at least two of your fellow students’ postings.
Wednesday, December 15, 2010 at 12:41am by smith

Math-Statistics
Suppose you want to test the claim that mean is not equal 3.5. Given a sample size of n = 45 and a level of significance of a = 0.10, when should you reject H0 ? A) Reject H0 if the standardized test statistic is greater than 1.96 or less than -1.96 B) Reject H0 if the ...
Saturday, December 12, 2009 at 2:43pm by Jenny

statistics
Suppose you want to test the claim that mu is not equal to 3.5. Given a sample size of n = 31 and a level of significance of alpha = 0.10 when should you reject Ho? A) Reject Ho if the standardized test statistic is greater than 2.575 or less than -2.575. B) Reject Ho if the ...
Tuesday, June 21, 2011 at 9:05pm by Brittany

statistical psychology
You might try a one-way ANOVA on this data. Use the appropriate table to compare your test statistic to the critical value from the table at .05 level of significance. If the test statistic exceeds the critical value from the table, reject the null and conclude a difference. ...
Tuesday, August 17, 2010 at 12:46pm by MathGuru

Statistics
This appears to be a hypothesis test involving inferences concerning two variances. Sample 1 (Girls): n = 21; variance = 100; df = n - 1 = 20 Sample 2 (Boys): n = 25; variance = 169; df = n - 1 = 24 Test statistic = sample 1 variance / sample 2 variance You can use the F-...
Monday, January 27, 2014 at 10:22am by MathGuru

Statistics
A few hints to get you started: 1. If H1 shows a specific direction, the test is one-tailed. If H1 does not show a specific direction (could be in either tail of the distribution curve), the test is two-tailed. 2. Use a one-sample z-test formula to determine the test statistic...
Friday, October 3, 2008 at 3:08pm by MathGuru

Statistics
Try a t-test since your sample size is rather small. Formula: t = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) sample mean = 8.2 population mean = 7.3 standard deviation = 1.4 sample size = 20 Plug in the values and ...
Sunday, March 10, 2013 at 1:30pm by MathGuru

Statistics
Your calculations look correct, as well as your conclusion. Part a) might be looking for the p-value, which is the actual level of the test statistic (z = -0.5873). If that is the case, then you can look up the p-value using the test statistic and a z-table. Good job!
Tuesday, March 31, 2009 at 11:34pm by MathGuru

Statistics
You can use a one-sample proportional z-test for your data. (Test sample proportion = .58 and sample size = 150) Find the critical value in the appropriate table at .01 level of significance for a two-tailed test. Compare the test statistic you calculate to the critical value ...
Friday, May 11, 2012 at 3:28pm by MathGuru

statistics
You can use a one-sample proportional z-test for your data. (Test sample proportion = 76/120 or .63) Find the critical value in the appropriate table at .05 level of significance for a one-tailed test. Compare the test statistic you calculate to the critical value from the ...
Tuesday, August 2, 2011 at 12:32am by MathGuru

statistics
You can probably use a one-sample proportional test for your data. (Test sample proportion = 65/80 or .8125) Find the appropriate table for your critical value at .10 level of significance for a one-tailed test. Compare the test statistic you calculate to the critical value ...
Friday, February 17, 2012 at 12:47am by MathGuru

statistics
Try a t-test since your sample size is rather small. Formula: t = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) sample mean = 12 population mean = 10 standard deviation = 3 sample size = 26 Plug in the values and calculate ...
Tuesday, May 3, 2011 at 11:11pm by MathGuru

statistics
mortgage broker is offering home mortgages at a rate of 9.5%, but the broker is fearful that this value is higher than many others are charging. A sample of 40 mortgages filed in the county courthouse shows an average of 9.25% with a standard deviation of 8.61%. Does this ...
Wednesday, June 19, 2013 at 5:09pm by Rald

statistics
You can try a proportional one-sample z-test for this problem. Check a table for the critical value to compare to the test statistic. If the test statistic exceeds the critical value, then reject the null and accept the alternative hypothesis.
Thursday, April 3, 2014 at 6:47am by MathGuru

Statistics
Use a one-sample z-test. z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) With your data: z = (522.3 - 530)/(29/√85) = ? Finish the calculation. Check a z-table at .01 level of significance for a two-tailed test (H1 ...
Friday, March 8, 2013 at 9:35pm by MathGuru

URGENT Statistics
In performing two-tailed hypothesis test with v=20, you obtain a t-statistic of 2.41. The p-value is: Between 2% and 5%. I need help understanding how this range was gotten. I know that the t-statistic is between t.025 and t.01 and since this is a 2-tailed test these t-values ...
Friday, December 10, 2010 at 1:19pm by Rhea

Psychological Statistics
Null: Ho: µ = 75 Alternate: Ha: µ ≠ 75 Test would be two-tailed because the alternate hypothesis does not show a specific direction (results could be in either tail of the distribution curve). Do a z-test using the data listed in the problem. Check a z-table for the ...
Monday, February 20, 2012 at 6:46pm by MathGuru

Statistics
In a study that was highly published doctors discovered that aspirin helps prevent heart attacks. The research project which was scheduled to last 5 years employed 22,000 american physicians (all male). Half took an aspirin tablet 3 times a week while the other half took a ...
Friday, February 23, 2007 at 4:24pm by Jason L

Statistics
Try a one-sample z-test for your problem. Using the z-test formula to find the test statistic: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) z = (3.69 - 3.65)/(.24/√45) Finish the calculation. Use a z-table to ...
Thursday, September 11, 2008 at 1:29am by MathGuru

Statistics
To determine whether themean nicotine content of a brand of cigarettes is greater than the advertised value of 1.4 milligrams, a health advocacy program tests: Ho: mu = 1.4 Ha: mu > 1.4 The calculated value of the test statistic is z = 2.42. ==> How do I calculate the p-...
Sunday, February 27, 2011 at 6:30pm by Emily

Math Help
Poll of statistic students revealed that 44% study alone, 31% study in a group, 12% study both alone and in a group Find the probability that a randomly selected statistic student studies alone but not in a group.
Wednesday, October 17, 2007 at 8:39pm by Taylor

statistics
Null hypothesis: p = .40 Alternate hypothesis: p does not equal .40 You can use a one-sample proportional z-test for your data. (Test sample proportion = .37 and sample size = 100) Find the critical value in the appropriate table at .01 level of significance for a two-tailed ...
Thursday, July 19, 2012 at 9:31pm by MathGuru

statistics
The critical region CR, or rejection region RR, is a set of values of the test statistic for which the null hypothesis is rejected in a hypothesis test. That is, the sample space for the test statistic is partitioned into two regions; one region (the critical region) will lead...
Sunday, December 29, 2013 at 10:58am by PsyDAG

statistics
Try a binomial proportion 2-sample test using proportions. Hypotheses: Ho: p1 = p2 Ha: p1 does not equal p2 -->this is a two-tailed test (the alternate hypothesis does not show a specific direction). Remember you are using proportions; therefore, convert all fractions to ...
Monday, April 16, 2012 at 7:41am by MathGuru

Statistics
This appears to be a hypothesis test involving inferences concerning two variances (standard deviation is the square root of the variance). Sample 1: n = 25; variance = sd^2; df = n - 1 = 24 Sample 2: n = 25; variance = sd^2; df = n - 1 = 24 Note: sd = standard deviation. Test...
Thursday, June 19, 2008 at 5:22am by MathGuru

stats
I'll give a few hints and let you take it from there. Hypotheses: Ho: µ ≥ 26 Ha: µ < 26 Try a z-test to determine the test statistic. Formula: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) With your data: z = (...
Wednesday, July 13, 2011 at 10:11am by MathGuru

math
As a a test of a new measurement process, 10 measurements are made on pieces of glass known to have conductivity 1. The average of the 10 measurements is 1.07. Indicate whether 1 and 1.07 is a parameter or statistic and explain why. I know 1.07 is a statistic. Please explain ...
Wednesday, February 27, 2013 at 6:08pm by please help

math
As a a test of a new measurement process, 10 measurements are made on pieces of glass known to have conductivity 1. The average of the 10 measurements is 1.07. Indicate whether 1 and 1.07 is a parameter or statistic and explain why. I understand that 1.07 is a statistic. ...
Tuesday, February 26, 2013 at 10:58pm by Please help

stats
1. FOR A ONE-TAILED TEST with alpha .01 = 2.33 (round accordingly) 2. Use a z-test to determine your test statistic. z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) Your data: sample mean = 55 population mean = 35 standard...
Tuesday, October 23, 2012 at 4:46pm by MathGuru

statistics
You can probably use a chi-square for this kind of problem. Hypotheses: Ho: There was equal distribution of viewers across the channels. Ha: There was unequal distribution of viewers across the channels. If there was equal distribution across the channels, you would expect 50 ...
Monday, August 9, 2010 at 7:49am by MathGuru

Statistics
Try a two-sample z-test. Hypotheses: Ho: µ1 = µ2 Ha: µ1 > µ2 Use a z-table to determine the critical or cutoff value to reject or fail to reject the null hypothesis at .01 level of significance. This will be a one-tailed test because the alternative hypothesis is showing a ...
Wednesday, November 7, 2012 at 3:20am by MathGuru

statistics
Try a t-test since your sample size is rather small. Ho: µ = 60 -->null hypothesis Ha: µ > 60 -->alternative hypothesis Formula: t = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) sample mean = 70 population mean = ...
Thursday, May 10, 2012 at 3:18pm by MathGuru

statistics
a random sample of 80 college students was selected to participate in a experiment. the mean of the sample is 317 points, the standard deviation of 37 there are 310 students that didn't complete the experiment 1. compute the appropriate test statistic? 2. what is the critical ...
Wednesday, July 11, 2012 at 2:40pm by Anonymous

math - stats
It is believed that at least 60% of voters from a certain region in Canada favor the free trade agreement (FTA). A recent poll indicated that out of 400 randomly selected individuals, 250 favored the FTA. If we wished to perform a test to determine whether the proportion of ...
Wednesday, December 19, 2012 at 12:05am by barbra

Stats.
If the test statistic exceeds the critical value from the chi-square table, then the null is rejected. Also, if the test statistic does not exceed the critical value from the table, then the null cannot be rejected. The above corrects the last few sentences. Sorry for any ...
Monday, March 28, 2011 at 11:43am by MathGuru

Statistics
This is a hypothesis test involving variances. Sample size for paper shredders = 7 Variance = ? (you will need to calculate the variance from the data given) degrees of freedom = 6 (df = n - 1) Sample size for calculators = 7 Variance = ? (you will need to calculate the ...
Wednesday, November 10, 2010 at 8:20pm by MathGuru

Statistics!!!
To find if there is a statistically significant linear relationship between speed and strength, use N-2 for degrees of freedom at the .01 significance level for a one-tailed test. Use a table for critical or cutoff values for a Pearson r. Compare the value from the table to ...
Monday, July 8, 2013 at 4:20pm by MathGuru

stats
Suppose i am interested in the average price of books at a bookstore. i randomly pick 15 books.? i calculate the average of those, report my findings to the newspaper. can you identify the following: a. the population under consideration b. the parameter of intrest c. the ...
Monday, January 17, 2011 at 7:26pm by laura

Statistic
A statistic instructor randomly selected four bags of oranges, each bag labeled 10 pounds, and weighed the bags.They weighed 10.4, 10.9 , 10.8, and 9.9 pounds.assume that the distribution of the weights is normal. Find a 95% confidence interval for the mean weight of all bags ...
Friday, December 6, 2013 at 11:21pm by Jaz

math-Statistics
Ho: µ ≤ 10 -->null hypothesis Ha: µ > 10 -->alternative hypothesis Using the z-test formula to find the test statistic: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) z = (14.44 - 10)/(4.45/sqrt of 35) I'll...
Sunday, June 8, 2008 at 7:33pm by MathGuru

Statistics
Try a proportional one-sample z-test for this one since this problem is using proportions. Here's a few hints to get you started: Null hypothesis: Ho: p ≥ .90 -->meaning: population proportion is greater than or equal to .90 Alternate hypothesis: Ha: p < .90 -->...
Friday, April 20, 2012 at 7:20pm by MathGuru

statistics
Try a two-sample test. Hypothesis: Ho: µ1 = µ2 Ha: µ1 does not equal µ2 This is a two-tailed test because the problem is just asking if there is a difference (no specific direction in the alternate hypothesis). Find the critical or cutoff value using the appropriate table at ....
Monday, April 16, 2012 at 7:33am by MathGuru

Statistics!!!
To find if there is a statistically significant linear relationship between number of friends and grade point average, use N-2 for degrees of freedom at the .05 significance level for a two-tailed test. Use a table for critical or cutoff values for a Pearson r. Compare the ...
Monday, July 8, 2013 at 4:21pm by MathGuru

statistic
a restaurant that bills its house account monthly is concerned that the average monthly bill exceeds $200 per account. A random sample of twelve account is selected, resulting in a sample mean of $220 and a standard deviation of $12. Use a= 0.05. what is the critical value for...
Tuesday, December 11, 2012 at 1:28am by HN

statistics 4.
Here are a few ideas to get you started. First problem: Try a one-sample z-test. Formula: z = (sample mean - population mean)/(standard deviation divided by the square root of sample size) Your data: sample mean = 2.6 population mean = 2.5 standard deviation = 0.5 sample size...
Tuesday, December 17, 2013 at 5:23pm by MathGuru

Quantitative Analysis
Analysis of Variance (ANOVA) results in the calculation of the F Statistic and interpretation of this statistic will inform you as to...? A. Which mean significantly differs from others B. Whether one or more of the means is significantly defferent from one or more of the ...
Thursday, November 7, 2013 at 3:39pm by Stacie

math
As a a test of a new measurement process, 10 measurements are made on pieces of glass known to have conductivity 1. The average of the 10 measurements is 1.07. Indicate whether 1 and 1.07 is a parameter or statistic and explain why. I know 1.07 is a statistic. I understand the...
Thursday, February 28, 2013 at 7:06pm by Please help

statistics
You can use a one-sample z-test on this data. Null hypothesis: Ho: µ = 3 -->meaning: population mean is equal to 3 minutes Alternate hypothesis: Ha: µ < 3 -->meaning: population mean is less than 3 minutes Using the z-test formula to find the test statistic: z = (...
Monday, June 23, 2008 at 1:09pm by MathGuru

Psychology Statistics
Determine whether the numerical value is a parameter or a statistic? In a phone survey of 100 random homes in a country, 21 families had garages. Is this a parameter because the data set of 100 random homes is a population? Is this a statistic, because the data set of 100 ...
Friday, September 9, 2011 at 8:27am by Margaret Sweet

Statistics- HELP!
900 is the population because that is your total pool. The 35 who receive the survey are the sample. See the key words "random sample" the statistic is the value you get from the results of the survey which is the mean of the satisfaction score. We don't really have a ...
Monday, February 11, 2013 at 1:48pm by JJ

college Math
Ho: µ = 40 --->meaning the population mean is equal to 40. H1: µ < 40 ---> meaning the population mean is less than 40. This will be a one-tailed test because the alternative hypothesis is showing a specific direction. Use a z-test. Find the significance level for a ...
Monday, December 7, 2009 at 8:30pm by MathGuru

statistics please
H0: µ = 80 -->null hypothesis H1: µ < 80 -->alternative hypothesis Critical value for a one-tailed test (the alternative hypothesis shows a specific direction) can be found using a z-table at .05 level of significance. Calculate the test statistic using a one-sample z...
Wednesday, December 12, 2012 at 6:59pm by MathGuru

math
As a a test of a new measurement process, 10 measurements are made on pieces of glass known to have conductivity 1. The average of the 10 measurements is 1.07. Indicate whether 1 and 1.07 is a parameter or statistic and explain why. I know 1.07 is a statistic. Please explain ...
Wednesday, February 27, 2013 at 9:39pm by Please help

statistics
Try a two-sample test. Hypothesis: Ho: µ1 = µ2 Ha: µ1 does not equal µ2 This is a two-tailed test because the problem is just asking if there is a difference (no specific direction in the alternate hypothesis). P-value is the actual level of the test statistic (using a z or t-...
Thursday, March 15, 2012 at 8:44pm by MathGuru

statistics
This level .05 determines where to reject the null (H0). If the test statistic for a hypothesis test is calculated and ends up exceeding the level .05, the null will be rejected in favor of the alternate hypothesis (H1). If the test statistic does not exceed the level .05, the...
Sunday, May 2, 2010 at 12:14pm by MathGuru

statistics
Formula: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) With your data: z = (12 - 10)/(3/√36) Once you have the z-test statistic, check a z-table for a one-tailed test (H1 is showing a specific direction) at .02 ...
Thursday, July 21, 2011 at 10:44pm by MathGuru

Math -- Statistic types used in public speaking
This is actually in my communications class. I have to decide which is the best statistic type is best to use in my speech. (mean, median or mode) I am struggling to decide which statistic would be used to support the following assertions? Louisiana’s educational system has ...
Saturday, October 6, 2007 at 7:25pm by Regina

statistics
Use the z-test formula to find the test statistic since you know the population standard deviation: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) With the data given in the problem: z = (190 - 200)/(50/√9) Finish ...
Friday, March 19, 2010 at 7:15am by MathGuru

statistics
Use a) for your hypotheses. You can try a proportional one-sample z-test since this problem is using proportions. Using a formula for a proportional one-sample z-test with your data included, we have: z = .16 - .15 -->test value (150/940) is .16) minus population value (.15...
Monday, December 10, 2012 at 3:57pm by MathGuru

business statistics
1. Use an ANOVA table to determine your table value using 0.05 level of significance. If the test statistic exceeds the critical value from the table, you reject the null. If the test statistic does not exceed the critical value from the table, you do not reject the null. 2. ...
Tuesday, August 11, 2009 at 12:14pm by MathGuru

Psychology
An essential part of scientific thinking is not only how to use statistics correctly, but also how to identify the misuse of statistics. Our textbook authors suggest that students should: Answer distrust all statistics because they convey a false impression of certainty and ...
Tuesday, April 23, 2013 at 4:11pm by J.J

Prob and Stat
Use a one-sample z-test. Formula: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) With the data in your problem: z = (58000 - 60000)/(7000/√49) Finish the calculation. If the test statistic exceeds the critical value...
Tuesday, May 17, 2011 at 2:15pm by MathGuru

Statistics
You can probably use an independent groups t-test for this data. Ho: µ1 = µ2 H1: µ1 does not equal µ2 Group 1 (Women) mean = 538.82 standard deviation = 114.16 sample size = 18 Group 2 (Men) mean = 525.23 standard deviation = 97.23 sample size = 12 degrees of freedom = n1 + n2...
Wednesday, February 1, 2012 at 5:30pm by MathGuru

eth
Statistic 1 of the Cultural Makeup column is provided for your reference. Note: you will find only two statistics to place in the Financial row. Statistic 1 Statistic 2 Statistic 3 Cultural Makeup 13.1 million U.S. residents are Asian or Asian in combination with other races ...
Friday, January 25, 2008 at 12:18pm by martha

eth
Statistic 1 of the Cultural Makeup column is provided for your reference. Note: you will find only two statistics to place in the Financial row. Statistic 1 Statistic 2 Statistic 3 Cultural Makeup 13.1 million U.S. residents are Asian or Asian in combination with other races ...
Friday, January 25, 2008 at 9:37pm by martha

Statistics!!!
To find if there is a statistically significant linear relationship between the number correct on a math test and the time it takes to complete the test, use N-2 for degrees of freedom at the .05 significance level for a one-tailed test or a two-tailed test. Use a table for ...
Monday, July 8, 2013 at 4:21pm by MathGuru

statistics
You may want to check this with a statistics text, but here is one way you might approach this problem. This looks like a hypothesis test involving two variances (standard deviation is the square root of the variance). The null hypothesis would be the ratio of the two ...
Monday, August 18, 2008 at 11:40am by MathGuru

statistics
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. Therefore, try ...
Monday, August 9, 2010 at 5:05pm by MathGuru

statistics
Try a two-sample independent groups t-test since your sample sizes are small. Hypothesis: Ho: µ1 = µ2 Ha: µ1 does not equal µ2 This is a two-tailed test because the problem is just asking if there is a difference (no specific direction in the alternate hypothesis). Degrees of ...
Friday, February 26, 2010 at 6:39pm by MathGuru

stats.& Prob
Null hypothesis: Ho: p = .50 -->meaning: population proportion is equal to .50 Alternative hypothesis: Ha: p does not equal .50 -->meaning: population proportion does not equal .50 Using a formula for a binomial proportion one-sample z-test with your data included, we ...
Monday, August 15, 2011 at 1:52pm by MathGuru

Statistics
It is believed that at least 60% of voters from a certain region in Canada favor the free trade agreement (FTA). A recent poll indicated that out of 400 randomly selected individuals, 250 favored the FTA. If we wished to perform a test to determine whether the proportion of ...
Thursday, January 24, 2013 at 11:13pm by Stanley

statistics/ Help!-thanks!
I would phrase the hypotheses this way: Ho: µ ≥ 1.73 Ha: µ < 1.73 This would be a one-tailed test since Ha is showing a specific direction (less than). Use a z-test: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size...
Saturday, August 25, 2012 at 4:28pm by MathGuru

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. What if you were ...
Monday, August 26, 2013 at 2:08pm by PsyDAG

math-test statistic
If we have a sample of 12 drawn from a normal population, then we would use as our test statistic A) z0 with 11 degrees of freedom B) t0 with 12 degrees of freedom C) z0 with 12 degrees of freedom D) t0 with 11 degrees of freedom
Saturday, December 5, 2009 at 8:35pm by jason

statistics
For your first problem: Standard Deviation = 3.29 (Standard deviation is the square root of the variance) Variance = 10.82 (Variance is standard deviation squared) Using a chi-square table for the endpoints: (n-1)s^2/16 to (n-1)s^2/1.69 (8-1)10.82/16 to (8-1)10.82/1.69 7(10.82...
Monday, March 18, 2013 at 12:32am by MathGuru

Statistics
All of these questions require you to read the F-distribution table for the values stated. I'll give you a few hints and see if you can take it from there. For #8: It's either A or B. Read the table using the degrees of freedom and significance level as guidelines. For #9: ...
Sunday, March 8, 2009 at 8:46pm by MathGuru

Math
I'm really stuck on these STATS questions.Can someone please help! 1. The probability of a car in a population having faulty brakes is .05. If we take a sample of 150 cars, find the standard deviation of the sampling distribution. 2. The strength of ten I-beams produced in a ...
Thursday, June 20, 2013 at 4:53pm by mysterychicken

Math
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population ...
Monday, October 10, 2011 at 1:12pm by Jen

Math...PLEASE HELP!!!!
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population ...
Sunday, October 9, 2011 at 11:35pm by Jen

statistics
This looks like an independent groups t-test. Here are a few hints: 1. d.f. for an independent groups t-test is this: n1 + n2 - 2 2. Use the denominator of the appropriate t-test as the standard error of the difference between the two means. 3. Use the appropriate t-test to ...
Thursday, April 29, 2010 at 3:35pm by MathGuru

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