In the above hypothesis test in Q1, t-statistics test reject the null hypothesis

Question

In the above hypothesis test in Q1, t-statistics test reject the null hypothesis, 40 is not within the confidence interval, but p value is smaller than the significance level alpha, how to explain this inconsistency?

Sample size is to small

Mistake in calculation when do the hypothesis test

The dataset collected has low quality

Sample size is to large

Sample size is to small

Mistake in calculation when do the hypothesis test

The dataset collected has low quality

Sample size is to large

Explanation / Answer

Answer is a

Small sample size

If the null hypothesis is rejected than the null hypothesised value doesn't lie in the confidence interval, & also p value is less than alpha

So H0 is rejected

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