Helppp plzzzzzz!!!!!!

A Fifty dog owners and 50 people who do not own dogs are each given a test to evaluate their stress levels. Dog owners are found

kiruha [24]

Answer: 2. It is likely that a confounding variable could be a contributing explanation for the difference between these two groups.

3. This is an observational study, not an experiment.

Step-by-step explanation:

Based on the information given, the statement that's true include:

• It is likely that a confounding variable could be a contributing explanation for the difference between these two groups.

• This is an observational study, not an experiment.

It is an observational study as the researcher observed just observed the scenarios without him trying to change the people that are being exposed to it or controlling it.

Therefore, the correct options are II and III only.

3 0

3 years ago

Consider a value to be significantly low if its z score less than or equal to minus−2 or consider a value to be significantly hi

katrin2010 [14]

Answer:

Test scores of 10.2 or lower are significantly low.

Test scores of 31.4 or higher are significantly high.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 20.8, \sigma = 5.3$