# How do you state your research question?

## How do you state your research question?

How to write a research questionChoose a broad topic.Do some preliminary reading to find out about topical debates and issues.Narrow down a specific niche that you want to focus on.Identify a practical or theoretical research problem that you will address.

## How do you interpret Z test?

The critical value is Z 1-α/2 for a two–sided test and Z 1-α for a one–sided test. For a two-sided test, if the absolute value of the Z-value is greater than the critical value, you reject the null hypothesis. If the absolute value of the Z-value is less than the critical value, you fail to reject the null hypothesis.

**How do you use Z test?**

How do I run a Z Test?State the null hypothesis and alternate hypothesis.Choose an alpha level.Find the critical value of z in a z table.Calculate the z test statistic (see below).Compare the test statistic to the critical z value and decide if you should support or reject the null hypothesis.

**What is a one sample z test?**

Introduction. The one-sample z-test is used to test whether the mean of a population is greater than, less than, or not equal to a specific value. Because the standard normal distribution is used to calculate critical values for the test, this test is often called the one-sample z-test.

### How do you do a one sample z test?

One-Sample z-TestDefine hypotheses. The table below shows three sets of null and alternative hypotheses. Specify significance level. Often, researchers choose significance levels equal to 0.01, 0.05, or 0.10; but any value between 0 and 1 can be used.Compute test statistic. Compute P-value. Evaluate null hypothesis.

### What are the assumptions of the Z test?

A z-test assumes that σ is known; a t-test does not. As a result, a t-test must compute an estimate s of the standard deviation from the sample. Under the null hypothesis that the population is distributed with mean μ, the z-statistic has a standard normal distribution, N(0,1).

**What are the assumptions of the one sample t test?**

The one sample t-test has four main assumptions:The dependent variable must be continuous (interval/ratio).The observations are independent of one another.The dependent variable should be approximately normally distributed.The dependent variable should not contain any outliers.

**What are the assumptions for a two sample t test?**

Two-Sample T-Test AssumptionsThe assumptions of the two-sample t-test are: The data are continuous (not discrete).The data follow the normal probability distribution. The two samples are independent. Both samples are simple random samples from their respective populations.

#### How do you test assumptions?

The simple rule is: If all else is equal and A has higher severity than B, then test A before B. The second factor is the probability of an assumption being true. What is counterintuitive to many is that assumptions that have a lower probability of being true should be tested first.

#### What is the difference between one sample and two sample t test?

An Independent Samples t-test compares the means for two groups. A Paired sample t-test compares means from the same group at different times (say, one year apart). A One sample t-test tests the mean of a single group against a known mean.

**Why would you use a two sample t test?**

What is the two-sample t-test? The two-sample t-test is a method used to test whether the unknown population means of two groups are equal or not.

**When should you use a one sample t test?**

The One Sample t Test is commonly used to test the following:Statistical difference between a sample mean and a known or hypothesized value of the mean in the population.Statistical difference between the sample mean and the sample midpoint of the test variable.