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## How do you determine sample size in biology?

In general, three or four factors must be known or estimated to calculate sample size: (1) the effect size (usually the difference between 2 groups); (2) the population standard deviation (for continuous data); (3) the desired power of the experiment to detect the postulated effect; and (4) the significance level.

## What does exponential growth mean in biology?

Summary. Exponential growth takes place when a population's per capita growth rate stays the same, regardless of population size, making the population grow faster and faster as it gets larger.

## How do you analyze biological replications?

How do I analyse a mixture of technical and biological replicates
Set up your experiment as normal, importing all of your runs (including your technical replicate runs of the pooled sample)
Align your runs' retention times.
Set up a pair of experiment designs:
Complete the rest of the workflow.

## What does it mean if a result is said to be significant at 1% level?

The significance level for a given hypothesis test is a value for which a P-value less than or equal to is considered statistically significant. Typical values for are 0.1, 0.05, and 0.01. These values correspond to the probability of observing such an extreme value by chance.

## What percentage is statistically significant?

Statistical hypothesis testing is used to determine whether the result of a data set is statistically significant. Generally, a p-value of 5% or lower is considered statistically significant.

## What should my sample size be?

A good maximum sample size is usually around 10% of the population, as long as this does not exceed 1000. For example, in a population of 5000, 10% would be 500. In a population of 200,000, 10% would be 20,000. This exceeds 1000, so in this case the maximum would be 1000.

## Is 150 a good sample size?

In a study of tens of thousands of lung function data we found that only samples over 1,000 subjects led to stable results. 150 is a very minimum, and when you have a number of such sets, predicted values may differ by + or -4 Z-scores.

## What is a good effective sample size?

The sample size measures the number of individual samples measured or observations used in a survey or experiment. It is believed that a sample size of 30 is required for an analysis to be valid, then the effective sample size – rather than the actual sample size – is used in such an assessment.

## How do you calculate exponential population growth in biology?

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Which is going to be our population size times 1 plus R where R is going to be the growth rate andMore

## What does it mean for a population to be in exponential population growth?

exponential growth: Continuous increase or decrease in a population in which the rate of change is proportional to the number of individuals at any given time.

## How do you find the exponential growth rate of a population?

From the given data, we can conclude the initial population value, x0, equals 10,000. Also, we have the growth rate of r = 5%. Therefore, the exponential growth formula we should use is: x(t) = 10,000 * (1 + 0.05)t = 10,000 * 1.05t .
How to calculate exponential growth.
year
t
x(t)
20291016,289
20301117,103
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Apr 6, 2022

## How many technical replicates should I have?

A good rule of thumb is that your sample size for the experiment in question – i.e. the number of technical replicates – should be double the total number of observations required for the mean value to converge on a set point.

## Should I average technical replicates?

Averaging technical replicates (as in the left panel) and running statistical analyses on average values means losing potentially important information. No facet should be dropped from analysis unless one is confident that it can have absolutely no effect on analyses.

## Why do you repeat experiments 3 times?

Repeating an experiment more than once helps determine if the data was a fluke, or represents the normal case. It helps guard against jumping to conclusions without enough evidence. The number of repeats depends on many factors, including the spread of the data and the availability of resources.

## What is a 5% significance level?

The significance level, also denoted as alpha or α, is the probability of rejecting the null hypothesis when it is true. For example, a significance level of 0.05 indicates a 5% risk of concluding that a difference exists when there is no actual difference.

## What is the critical value at the 0.05 level of significance?

The level of significance which is selected in Step 1 (e.g., α =0.05) dictates the critical value. For example, in an upper tailed Z test, if α =0.05 then the critical value is Z=1.645.

## How do you determine if a result is statistically significant?

The smaller the p-value, the stronger the evidence that you should reject the null hypothesis. A p-value less than 0.05 (typically ≤ 0.05) is statistically significant. It indicates strong evidence against the null hypothesis, as there is less than a 5% probability the null is correct (and the results are random).

## How do you know if your t test is significant?

If the computed t-score equals or exceeds the value of t indicated in the table, then the researcher can conclude that there is a statistically significant probability that the relationship between the two variables exists and is not due to chance, and reject the null hypothesis.

## What does a significance test statistic tell us?

A test of significance is a formal procedure for comparing observed data with a claim (also called a hypothesis), the truth of which is being assessed. • The claim is a statement about a parameter, like the population proportion p or the population mean µ.