The kaiser medical foundation claims that the cost to rehabilitate a football player following a head injury is at most $28,500. to test this claim a researcher surveys the medical billing records of 45 football players who were treated for head injuries. the average cost for rehabilitation in this randomly selected sample is $30,885 with a standard deviation of $1,123. is the actual cost of rehabilitation at most $28,500 as kaiser claims?

t-statistic > t-critical, we reject the null hypothesis.

Therefore, we conclude that kaiser claim is valid.

Explanation:

In this question,

Null hypothesis, : Actual cost of rehabilitation is greater than $28,500

Alternative Hypothesis, : Actual cost of rehabilitation at most $28,500

the medical billing records of 45 football players, n = 45

\bar{X} ⇒  average cost for rehabilitation = $30,885

: u > 28500 ⇒ Kaiser claims is not valid

: u ≤ 28500 ⇒  Kaiser claims is valid

t - statistic =

=

= 14.25

From the t- distribution, with degree of freedom = n-1 ⇒ 45-1 = 44 and level of significance 0.05

t-critical value = 1.6802

So,

t-statistic > t-critical, we reject the null hypothesis.

Therefore, we conclude that kaiser claim is valid.

explanation: doctrine of respondeat superior is a legal doctrine that is commonly used in tort. this principle makes an employer or principal legally responsible for the wrongful acts done by an employee or agent, if such acts occur within the scope of the employment or agency.

answerreactive approach;