Question 1179004
<pre><font face = "consolas" color = "indigo" size = 3><b>
Hi
population: µ = 7.5    Sample(n=41): x̄ = 8.6  s = 2.9
Ho:  µ = 7.5
Ha:  µ ≠ 7.5
Confidence Interval .05:  two-tailed t-test: t(df40) = |t-value|> 2.02 Reject Ho

t-value = {{{blue (x - mu)/blue(sigma/sqrt(n))}}} = √41(1.1)/2.9 = 2.43
 2.43 > 2.02
Reject Ho, Evidence shows drug has changed the mean pH level of the blood.

Wish You the Best in your Studies.
</font></b></pre>