# Questions tagged [hypothesis-testing]

Hypothesis testing assesses whether data are inconsistent with a given hypothesis rather than being an effect of random fluctuations.

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### Testing positive relationship with multiple predictors

For a research project I am working on I am trying to determine if there is a positive relationship between two predictors and a response. My current model is: Salary = B0 + B1 Cost + B2 SchoolType + ...
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### Sample size estimation for linear regression with repeated measurements

i'm in a bit of a pickle. I have a quantity y that I want to estimate from a measurement x, via linear regression. Per data point, i can repeat n-times the measurement of x, e.g. to get a better ...
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### I need to think about the best model to use for the below problem and im unsure how to solve this question [closed]

In an estuarine habitat, researchers are interested in understanding how salinity affects the activity rate of a bivalve mollusc that plays an important role in sequestering nutrients from the water ...
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### Correct use of Chi-square and hypothesis testing?

I have a dataset which contains lots of data on customers and their actions within their journey through our business, one of these actions is how many of our events they have attended, another action ...
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### Independent Sample T-test or Mann-Whitney U test?

I am a very young stats learner, and I need help understanding the justification of a test choice. I have a sample of 39 participants (20 females and 19 males) been measured on task performance, and I ...
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### Will a negative data value have impact on t-test?

I want to test the significant difference between two data sets via t-test. control group = 2 observations Treatment group = 2 observations Sample replicate-1 replicate-2 control 41.043 -38.567 ...
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### ks test for uniform distribution

My question is similar to this post (KS test for Uniformity). KS p-valuse changes when samples are in different position, even if they have the same intervals. For example: ks.test(c(1,2,3),"...
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### Standard convention for test statistic for F-test?

According to my textbook, Mathematical Statistics with Applications 7th. Ed, they write the test statistic in a F-test, that compares variances of two different populations, so that the larger ...
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### Question regarding asymptotic assumptions and hypotesis testing paradox for large samples

Suppose we would like to verify if a r.v $X$ follows a distribution with cumulative density as $F$, if $n$ goes to $\infty$ I'm able to use komogorov test which states reject $H_0$ (stating that $X$ ...
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My question is relatively simple, and has to do with reporting seemingly contradictory results from statistical tests. This is the problem. There are two independent groups, and two research questions ...
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### Interpretation of the Holm procedure

I have used the following code in Stata to calculate the p-values using the Holm method. However, I can't understand what to report and how to interpret these results. ...
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### Legitimacy of transforming data before statistical tests

I have two groups of samples (N=4 for each) and found that there is one outlier for each group (both are higher than the rest of the respected samples within the groups). I have no resources to repeat ...
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### Understanding the "multiple comparisons problem"

I am trying to understand the multiple comparisons problem based on the wikipedia article below: https://en.wikipedia.org/wiki/Multiple_comparisons_problem In this article they take the following ...
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### What kind of parametric test to use to find difference in distribution for two Heteroskedastic sample?

I was analysing Titanic Dataset, and I have to answer this question: Is there a significant difference in Age distribution between those who survived and those who did not? Given: N1=865, N2=430 Both ...
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### Is it reasonable to set the null hypothesis as the well-accept classic model?

Suppose that I did an experiment and collected a dataset. In previous literature these type of dataset are explained by a well-accepted model, called Model M. I believe that the Model M cannot explain ...
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### Relationship between the t-statistic and F-statistic in simple linear regression

Consider the simple linear regression model $y_i = \beta_0 + \beta_1{x_i} + \epsilon_i$ Suppose in an OLS, the $t$-statistic for the null hypothesis $\beta_1 = 0$ is $1.92$, what is the $F$-...
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### Test if regression coefficients are equal between periods of time

I have multiple observations per year and I was asked to estimate an individual regression line for each year within a single model. My data has three years (1979, 1980 and 1981) and two independent ...
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### How can I test if there are significant differences between four distributions?

Here is a graphical display of my data: The x-axis is categorical from 0-5 in terms of how many of a certain damage type are present on a leaf (with pink and blue bars representing the different ...
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### Appropriate Statistical Test for Repeated Paired Data

I'm having trouble deciding the appropriate statistical test to use for a given experiment. 13 participants filled out a survey before and after variations of a treatment. Given the participant's ...
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### Experimental Design for clinical trial

A clinical trial is to be carried out using four different therapies A, B, C and D. The effects of the therapies on tumour size are to be compared. Four patients are to be tested, one on each of the ...