# Stuck on what statistical tests to use..?

Watch
Announcements
#1
Hi all,

I’m currently analysing some data that I have collected in my postgraduate research and I am struggling to nail down which statistical tests I need to use.

I conducted a study on treatment seeking of heavy menstrual bleeding using two groups (menstruating women and practice nurses) and administered an identical survey to both.

The sample size for the menstruating women is 66 and the sample size for the practice nurses is only 33. Could I still use an independent t-test for comparison between the two groups, as the sample sizes differ quite a bit? If not, what alternatives could I use please? I really appreciate any input in this to help me. Also, if you could supply any academic references to support your point or to help me that would be appreciated also.

I feel like I should really know this stuff at this point, but statistics has always been a weak point of mine!

0
3 years ago
#2
(Original post by abbi_lloyd)
Hi all,

I’m currently analysing some data that I have collected in my postgraduate research and I am struggling to nail down which statistical tests I need to use.

I conducted a study on treatment seeking of heavy menstrual bleeding using two groups (menstruating women and practice nurses) and administered an identical survey to both.

The sample size for the menstruating women is 66 and the sample size for the practice nurses is only 33. Could I still use an independent t-test for comparison between the two groups, as the sample sizes differ quite a bit? If not, what alternatives could I use please? I really appreciate any input in this to help me. Also, if you could supply any academic references to support your point or to help me that would be appreciated also.

I feel like I should really know this stuff at this point, but statistics has always been a weak point of mine!

You can use a t-test even if you have unequal sample sizes. The main issue is just that to have the maximum amount of power to detect any differences between groups it would be good to have them as balanced as possible (though having two smaller, but equally sized groups isn't particularly better!).

I'd use Welch's t-test which automatically is calculated by spss under the "equal variances not assumed" row.
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Feeling behind at school/college? What is the best thing your teachers could to help you catch up?

Extra compulsory independent learning activities (eg, homework tasks) (18)
7.35%
Run extra compulsory lessons or workshops (37)
15.1%
Focus on making the normal lesson time with them as high quality as possible (44)
17.96%
Focus on making the normal learning resources as high quality/accessible as possible (35)
14.29%
Provide extra optional activities, lessons and/or workshops (64)
26.12%
Assess students, decide who needs extra support and focus on these students (47)
19.18%