9

A staff member at UF's Wellness Center is interested in seeing if a new stress reduction program will lower employees systolic b

Yuri [45]

Answer:

A. On average the blood pressure levels before the stress reduction program were significantly higher than the systolic blood pressure levels after the stress reduction program, at 95% confidence level

Step-by-step explanation:

The confidence interval parameters is intended to detect if the new stress reduction program will lower the systolic blood pressure levels of employees

The difference between the the mean systolic blood pressure levels taken = The before systolic pressure - The after systolic blood pressure

The 95% confidence interval obtained = (5.6, 10.2)

Therefore, given that the values of the difference between the means are both positive, then there a difference as the confidence interval does not include zero (0), and at the 95% confidence level, the average systolic blood pressure levels before the stress reduction program are higher than the average systolic blood pressure levels after the program

5 0

3 years ago

A statistics teacher taught a large introductory statistics class, with 500 students having enrolled over many years. The mean s

soldi70 [24.7K]

Answer:

The teacher select a sample of n =15 students. And he wanted to know if teaching a smaller class was more effective and students performed better, that means if $\mu >78$ and he obtaind a sample mean of $\bar X>83$ .

Based on this the correct system of hypothesis are:

Null hypothesis: $\mu =78$

Alternative hypothesis: $\mu >78$

And the best option for this case is:

a. H0: $\mu=78$ vs. H1: $\mu>78$ .

Step-by-step explanation:

For this case we have the following previous info given:

$\mu = 78$ represent the true mean

$\sigma =10$ represent the true deviation

The teacher select a sample of n =15 students. And he wanted to know if teaching a smaller class was more effective and students performed better, that means if $\mu >78$ and he obtaind a sample mean of $\bar X>83$ .

Based on this the correct system of hypothesis are:

Null hypothesis: $\mu =78$

Alternative hypothesis: $\mu >78$

And the best option for this case is:

a. H0: $\mu=78$ vs. H1: $\mu>78$ .

5 0

3 years ago

PLEASE HELP!! URGENT

Schach [20]

Answer:

The answer is option 1.

Step-by-step explanation: