Arandom sample of 16 emergency reports was selected from the files of an ambulance service. the mean time( computed from these sample data) required for ambulances to reach their destinations was 13 minures, with a variance of 9. can we conclude at the 0.05 significance level that the mean is greater than 10 minutes? state and test the appropriate hypothesis.

We can conclude that the mean time is greater than 10 minutes.

Step-by-step explanation:

In this case we have to perform a hypothesis testing of the mean, with standard deviation of the population unknown.

The conclusion we have to demonstrate with evidence is that the mean is greater than 10 min, so the null and alternative hypothesis became:

The significance level is 0.05.

The test statistic is

For a sample size of n=13, the degrees of freedom are 13-1=12. We can look up in a t-table the P-value for a t=3.614 and df=12.

The P-value is 0.00178. As the P-value is less than the significance level, we can conclude that the effect is significant and the null hypothesis is rejected.

We can conclude that the mean time is greater than 10 minutes.

answer: the answer is one of

step-by-step explanation:   we are given to write a proper fraction where the whole is divided into an even number of equal parts less than ten, and an odd number of those parts exist.

an even number less than 10 may be one of 2, 4, 6 or 8. so, the whole may be one of these four evens.

now, an odd number of these parts must exist, so the numerator must be an odd number, one of 1, 3, 5 or 7. it cannot be 9 because then the fraction will become improper.

thus, our fraction may be one of the following