Sunday

April 20, 2014

April 20, 2014

Number of results: 18

**biostatistic**

Thanks for your help.
*Wednesday, November 21, 2012 at 11:53am by nono*

**Biostatistic**

Yes
*Thursday, December 20, 2012 at 8:00pm by Aliza*

**biostatistic**

I would say no.
*Tuesday, December 11, 2012 at 5:31pm by PsyDAG*

**biostatistic**

No, it is more likely to reject with 10%.
*Tuesday, December 11, 2012 at 5:19pm by PsyDAG*

**biostatistic**

False. For smaller effect sizes a larger sample size would be required.
*Tuesday, December 11, 2012 at 1:06pm by MathGuru*

**biostatistic**

can we use t-test for two independent sample and dichotomus study with less than five success or failures?
*Wednesday, November 28, 2012 at 1:01pm by nono*

**Biostatistic**

The following replicate calcium determinations on a blood sample using atomic absorption spectrophotometry (AAS) and a new colorimetric method were reported. Is there a significant difference in the precision of the two methods?
*Thursday, December 20, 2012 at 8:00pm by Jam*

**biostatistic**

is it true that it is more difficult to reject a null hyputhesis if we use a 10 %level of significance compared with a 5% level of significance?
*Tuesday, December 11, 2012 at 5:19pm by nono*

**biostatistic**

Is this statement true or false: when calculating correlation coefficient between two continous variables, the scale on which the variables are measured affect the value of the correlation coefficient.
*Tuesday, December 11, 2012 at 5:31pm by nono*

**biostatistic**

I am sorry, I do not know how one question is printed so many times. There was some problem in submission of question and when it is submitted, it is printed so many times.
*Tuesday, December 11, 2012 at 5:27pm by nono*

**biostatistic**

recent suggestion is 60 min of exercise per day. A sample of 50 adults in a study of risk factor report exercising a mean of 38 min per day with a standerd deviation of 19 min .based on sampal data, is physical activity significantly less than recommended? Run the appropriate ...
*Tuesday, November 20, 2012 at 1:37pm by nono*

**biostatistic**

is it true that sample size required to detect an effect size of 0.25 is larger than the sample size required to detect an effect size of 0.05 with 80% power ansd a 5% level of signisicance?
*Tuesday, December 11, 2012 at 1:06pm by nono*

**biostatistic**

I think you're asking whether a t-test is appropriate when your data consists of a binary response, i.e. a Success or a Failure, and you've got a very small number of responses. If so, the answer is no it isn't: it seems to me you ought to be looking at some sort of ...
*Wednesday, November 28, 2012 at 1:01pm by David Q/R*

**Biostatistic**

An enzymatic method for determining alcohol in wine is evaluated by comparison with a gas-chromatography (GC) method. the same sample is analyzed several times by both methods with the following results (% ethanol). Enzymatic method: 13.1, 12.7, 12.6, 13.3, 13.3. GC method: 13...
*Thursday, December 20, 2012 at 7:57pm by Jam*

**biostatistic**

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 = (38 - 60)/(19/√50) = ? Finish the calculation. Check a z-table at .05 level of significance for a one-tailed test. If the z...
*Tuesday, November 20, 2012 at 1:37pm by MathGuru*

**biostatistic**

there are 200 subjects enrolled to receive either experimental medications or placebo. At the end of study following data is collected after 6 week. (sd)= standard deviation. BP= blood pressure. experimental meds placebo (n=100) (n=100) Mean BP 120.2(sd 15.4) 131.4(sd18.9) ...
*Saturday, November 24, 2012 at 11:41pm by nono*

**Biostatistic**

A study is conducted in patient with HIV. Lower CD4 count is associated with advance disease. The researcher is interested in finding out the relation between supplement vitamins and CD4 count. A multiple regression analysis is performed relating CD4 count to the use of ...
*Tuesday, December 11, 2012 at 11:27pm by nono*

**Biostatistic**

A study is conducted in a patient with HIV.Lower CD4 count is associated with advance disease. A researcher is interested in the association between vitamin supplement and CD4 count.A MULTIPLE REGRESSION ANALYSIS is performed relating CD4count to the use of supplements(coaded ...
*Tuesday, December 11, 2012 at 11:43pm by nono*

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