Why there is no value shown for 5% trimmed mean?

08 August 2018 0 3K Report

I have analysed my raw data and check normality to check on any errors. When I run the normality test, I realised the descriptive table in the SPSS output shows no value (-) for 5% trimmed mean. However, there is a value for mean. Please find below, the screenshot for your reference. Could you please advise the possible error in my raw data? I am clueless.

1. Mean : 2.2067

2. 95% Confidence Interval for Mean

a) lower bound : 1.4178

b) Upper bound : 2.9955

3. 5% Trimmed Mean : -

4. Median : 2.3900

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