91影视

Given in the question that,

Population mean$\left(渭\right)=0$

Sample mean$\left(\overline{x}\right)=-6$

Sample size$\left(n\right)=50$

Sample standard deviation$\left(s\right)=19.8$we have to find Do these data provide convincing evidence of an average decrease in blood pressure among all of the company's employees during this year.

The formula to compute the test statistic is:

$t=\frac{\overline{x}-渭}{{\displaystyle \frac{s}{\sqrt{n}}}}$

using the information, the null and alternative hypothesis are:

$H_0:渭=0$

$H_{伪}:渭<0$

$H_0:渭<0$

Using the Ti-83 calculator the output is:

The p-value is less than the significance level. Thus, decision is written as the rejection of the null hypothesis

At $5\%$significance level, there are sufficient evidence to support the provided claim.

Given in the question that,

Population mean$\left(渭\right)=0$

Sample mean$\stackrel{炉}{x}=-6$

Sample size$\left(n\right)=50$

Sample standard deviation$\left(s\right)=19.8$we have to find Can we conclude that the health campaign caused a decrease in blood pressure.

Because the outcome of an observational study is unaffected, and the case presented is an observational study. As a result, no conclusion can be formed at this time.