Answer:
The conclusion is that the researcher was correct
Explanation:
From the question we are told that
The sample size is

The sample mean is

The standard deviation is

The significance level is

The Null Hypothesis is

The Alternative Hypothesis is

The test statistic is mathematically represented as

Substituting values


Now the critical value for
is

This obtained from the critical value table
So comparing the critical value of alpha and the test value we see that the test value is less than the critical value so the Null Hypothesis is rejected
The conclusion is that the researcher was correct