## How do you determine a random sample size?

You are conducting a survey to estimate a population mean or proportion….How to Choose Sample Size for a Simple Random Sample.

Sample statistic | Population size | Sample size |
---|---|---|

Proportion | Known | n = [ ( z2 * p * q ) + ME2 ] / [ ME2 + z2 * p * q / N ] |

Proportion | Unknown | n = [ ( z2 * p * q ) + ME2 ] / ( ME2 ) |

## What sample size is needed to give a margin of error of 5% with a 95% confidence interval?

about 1,000

For a 95 percent level of confidence, the sample size would be about 1,000.

**How many samples do I need for 95 confidence?**

Remember that z for a 95% confidence level is 1.96. Refer to the table provided in the confidence level section for z scores of a range of confidence levels. Thus, for the case above, a sample size of at least 385 people would be necessary.

### How large should a sample size be?

A good maximum sample size is usually 10% as long as it does not exceed 1000. 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.

### What is a good sample size for quantitative research?

Sample sizes larger than 30 and less than 500 are appropriate for most research.

**How big of a sample size do I need?**

## How large a sample is necessary if nothing is known about the population?

Usually, researchers regard 100 participants as the minimum sample size when the population is large.

## How large a sample size is needed if I want my 95% confidence interval to have a 4% margin of error?

Because there is no estimate of the proportion given, we use for a conservative estimate. This is the minimum sample size, therefore we should round up to 601. In order to construct a 95% confidence interval with a margin of error of 4%, we should obtain a sample of at least .

**What is a reasonable sample size?**

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.

### Is 30 participants enough for quantitative research?

Although sample size between 30 and 500 at 5% confidence level is generally sufficient for many researchers (Altunışık et al., 2004, s.

### How do you calculate random sample?

Given a simple random sample, the best estimate of the population variance is: s2 = Σ ( xi – x )2 / ( n – 1 ) where s2 is a sample estimate of population variance, x is the sample mean, xi is the ith element from the sample, and n is the number of elements in the sample.

**What is the simple random sample Formula?**

The three will be selected by simple random sampling. The mean for a sample is derived using Formula 3.4. (3.4) where xi is the number of intravenous injections in each sampled person and n is the number of sampled persons. For example, assume that Roy-Jon-Ben is the sample.

## How to create a random sample in Excel?

Add row to the right of the Column of numbers you want to sample and name it whatever you want to call it (i.e. Random Sample).

## How do I calculate a random sample in Excel?

Creating a Random Sample Right-click the far left column’s name. For example, if all of your data begins in column “A”, you’d right-click the “A” at the top of the page. Click Insert. This will add a column to the left of your current left column. Select the new “A1” cell. Type “= RAND()” into this cell. Exclude the quotation marks. Press ↵ Enter.